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SEQUENCES IN ORACLE SQL WITH EXAMPLES (asc, desc, cycle, nocycle, cache, nocache)
 
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This video tutorial is to understand the working of sequences in oracle SQL. The video demonstrations explain all the attributes of a create sequence statement such as start with, increment by, maxvalue, nomaxvalue, minvalue, nominvalue, cycle, nocycle, cache, nocache, order, and noorder. All the parameters are explained with appropriate examples so that the user can understand them clearly. For more detail refer to the link: http://plsqlnsql.blogspot.com/2017/01/sequences.html
Views: 1920 Kishan Mashru
Oracle 11g SQL Results Cache Training by SkillBuilders Dave Anderson
 
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Learn how, by using the Oracle Database 11g Results Cache, you can get phenomenal performance from repeated executions of queries against large, static data. From Dave Anderson of SkillBuilders.com/Oracle.
Views: 3283 SkillBuilders
Oracle Hints Tutorial for improving performance
 
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Oracle Hints Tutorial for improving performance APPEND PARALLEL JOIN INDEX NO_INDEX SELECT /*+ FIRST_ROWS(10) */ * FROM emp WHERE deptno = 10; SELECT /*+ ALL_ROWS */ * FROM emp WHERE deptno = 10; SELECT /*+ NO_INDEX(emp emp_dept_idx) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ INDEX(e,emp_dept_idx) */ * FROM emp e WHERE e.deptno = 10; -- SELECT /*+ INDEX(scott.emp,emp_dept_idx) */ * FROM scott.emp; SELECT /*+ AND_EQUAL(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ INDEX_JOIN(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ PARALLEL_INDEX(e,emp_dept_idx , 8) */ * FROM emp e; SELECT /*+ LEADING (dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ PARALLEL(8) CACHE (e) FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL USE_MERGE (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- SORT Merge Join SELECT /*+ PARALLEL USE_HASH (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- Hash Join SELECT /*+ PARALLEL */ * FROM emp e ; INSERT /*+ APPEND */ INTO mytmp select /*+ CACHE (e) */ *from emp e; commit;
Views: 4842 TechLake
Result Cache
 
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Parses and Data Dictionary watch more videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjab, Tutorials Point India Private Limited
How to Cache Database Queries with Redis in Laravel - Redis Series Episode 4
 
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In this short episode, I show you how you can cache database queries for a certain period of time. This is really nice when you have data you know won't change during x period of time, because once it's in cache, Laravel knows to automatically skip the database query and immediately deliver the requested content from RAM. Super fast, super easy. Here's the complete project throughout all episodes: https://gitlab.com/Christf24/RedisCast/tree/master/ Next episode will go over tagging with Redis (for blog posts, movie genres, or whatever else). Previous episode (Counting page views, and creating a "Top Viewed Article" list on home page): https://www.youtube.com/watch?v=ZMjw5WFPG8c Next episode (Tagging articles, products, movies, etc..): http://youtu.be/L2keoHFThwY
Views: 20833 Christophe Limpalair
Sql server query plan cache
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache.html Slides http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache_12.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All SQL Server Tutorial Videos https://www.youtube.com/playlist?list=PL08903FB7ACA1C2FB All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss 1. What happens when a query is issued to SQL Server 2. How to check what is in SQL Server plan cache 3. Things to consider to promote query plan reusability What happens when a query is issued to SQL Server In SQl Server, every query requires a query plan before it is executed. When you run a query the first time, the query gets compiled and a query plan is generated. This query plan is then saved in sql server query plan cache. Next time when we run the same query, the cached query plan is reused. This means sql server does not have to create the plan again for that same query. So reusing a query plan can increase the performance. How long the query plan stays in the plan cache depends on how often the plan is reused besides other factors. The more often the plan is reused the longer it stays in the plan cache. How to check what is in SQL Server plan cache SELECT cp.usecounts, cp.cacheobjtype, cp.objtype, st.text, qp.query_plan FROM sys.dm_exec_cached_plans AS cp CROSS APPLY sys.dm_exec_sql_text(plan_handle) AS st CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp ORDER BY cp.usecounts DESC As you can see we have sorted the result set by usecounts column in descending order, so we can see the most frequently reused query plans on the top. usecounts - Number of times the plan is reused objtype - Specifies the type of object text - Text of the SQL query query_plan - Query execution plan in XML format To remove all elements from the plan cache use the following command DBCC FREEPROCCACHE In older versions of SQL Server up to SQL Server 6.5 only stored procedure plans are cached. The query plans for Adhoc sql statements or dynamic sql statements are not cached, so they get compiled every time. With SQL Server 7, and later versions the query plans for Adhoc sql statements and dynamic sql statements are also cached. Things to consider to promote query plan reusability For example, when we execute the following query the first time. The query is compiled, a plan is created and put in the cache. Select * From Employees Where FirstName = 'Mark' When we execute the same query again, it looks up the plan cache, and if a plan is available, it reuses the existing plan instead of creating the plan again which can improve the performance of the query. However, one important thing to keep in mind is that, the cache lookup is by a hash value computed from the query text. If the query text changes even slightly, sql server will not be able to reuse the existing plan. For example, even if you include an extra space somewhere in the query or you change the case, the query text hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. Another example : If you want the same query to find an employee whose FirstName is Steve instead of Mark. You would issue the following query Select * From Employees Where FirstName = 'Steve' Even in this case, since the query text has changed the hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. This is why, it is very important to use parameterised queries for sql server to be able to reuse cached query plans. With parameterised queries, sql server will not treat parameter values as part of the query text. So when you change the parameters values, sql server can still reuse the cached query plan. The following query uses parameters. So even if you change parameter values, the same query plan is reused. Declare @FirstName nvarchar(50) Set @FirstName = 'Steve' Execute sp_executesql N'Select * from Employees where [email protected]', N'@FN nvarchar(50)', @FirstName One important thing to keep in mind is that, when you have dynamic sql in a stored procedure, the query plan for the stored procedure does not include the dynamic SQL. The block of dynamic SQL has a query plan of its own. Summary: Never ever concatenate user input values with strings to build dynamic sql statements. Always use parameterised queries which not only promotes cached query plans reuse but also prevent sql injection attacks.
Views: 21724 kudvenkat
قواعد البيانات 2  (database buffer cache (Oracle DBA 11g Tutorial
 
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database buffer cache in oracle 11g - Memory Structures - Overview of the System Global Area
Views: 753 Ahmed Ybat
What to choose for performance   SubQuery or Joins   Part 62
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2013/01/what-to-choose-for-performance.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-62-what-to-choose-for-performance.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists What to choose for performance - SubQuery or Joins According to MSDN, in sql server, in most cases, there is usually no performance difference between queries that uses sub-queries and equivalent queries using joins. For example, on my machine I have 400,000 records in tblProducts table 600,000 records in tblProductSales tables The following query, returns, the list of products that we have sold atleast once. This query is formed using sub-queries. When I execute this query I get 306,199 rows in 6 seconds Select Id, Name, Description from tblProducts where ID IN ( Select ProductId from tblProductSales ) At this stage please clean the query and execution plan cache using the following T-SQL command. CHECKPOINT; GO DBCC DROPCLEANBUFFERS; Go DBCC FREEPROCCACHE; GO Now, run the query that is formed using joins. Notice that I get the exact same 306,199 rows in 6 seconds. Select distinct tblProducts.Id, Name, Description from tblProducts inner join tblProductSales on tblProducts.Id = tblProductSales.ProductId Please Note: I have used automated sql script to insert huge amounts of this random data. Please watch Part 61 of SQL Server tutorial, in which we have discussed about this automated script. According to MSDN, in some cases where existence must be checked, a join produces better performance. Otherwise, the nested query must be processed for each result of the outer query. In such cases, a join approach would yield better results. The following query returns the products that we have not sold atleast once. This query is formed using sub-queries. When I execute this query I get 93,801 rows in 3 seconds Select Id, Name, [Description] from tblProducts where Not Exists(Select * from tblProductSales where ProductId = tblProducts.Id) When I execute the below equivalent query, that uses joins, I get the exact same 93,801 rows in 3 seconds. Select tblProducts.Id, Name, [Description] from tblProducts left join tblProductSales on tblProducts.Id = tblProductSales.ProductId where tblProductSales.ProductId IS NULL In general joins work faster than sub-queries, but in reality it all depends on the execution plan that is generated by SQL Server. It does not matter how we have written the query, SQL Server will always transform it on an execution plan. If sql server generates the same plan from both queries, we will get the same result. I would say, rather than going by theory, turn on client statistics and execution plan to see the performance of each option, and then make a decision. In a later video session we will discuss about client statistics and execution plans in detail.
Views: 83188 kudvenkat
Statement Execution and the Plan Cache
 
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Kimberly will discuss the impact on caching / performance of different methods of statement execution. Briefly, she will also compare / contrast this with stored procedures. In the end, you’ll know the best way to request data so that stable requests are cached and unstable requests are not (giving you the most optimal performance). Kimberly has been a Microsoft SQL Server MVP and a Microsoft Regional Director for over 10 years. She's an author, consultant, and top-rated speaker, having spoken at PASS, TechEd, SQLintersection, and numerous other events around the world. She has over 20 years of experience designing and tuning SQL Server solutions with a focus on optimizing procedural code, indexing strategies, statistics, and partitioning. When she's not tuning SQL servers, she's diving and photographing all sorts of underwater critters such as frogfish with her husband, Paul S. Randal. Hosted by Steve Cantrell DBAFundamentals
Views: 946 DBAFundamentals
How much faster is the Redis Query vs the PostgreSQL Query - Part 70
 
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Learn how much faster the Redis Query is compared to the PostgreSQL query. Code: https://github.com/benawad/fullstack-graphql-airbnb-clone/tree/70_cache_performance Playlist: https://www.youtube.com/playlist?list=PLN3n1USn4xlnfJIQBa6bBjjiECnk6zL6s ---- Join the Discord: https://discord.gg/Vehs99V ---- Patreon: https://www.patreon.com/benawad ---- Follow Me Online Here: Medium: https://medium.com/@benawad Twitter: https://twitter.com/benawad97 GitHub: https://github.com/benawad Facebook: https://www.facebook.com/benawad97/ LinkedIn: https://www.linkedin.com/in/benawad/ Instagram: http://instagram.com/benawad97
Views: 801 Ben Awad
Oracle 11gR2 New Features for Developers
 
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Presented by Dan Hotka Tues 13th Mar 2012 Summary Join Oracle ACE Director Dan Hotka live online as he discusses new features of Oracle 11g for developers. This presentation is a must-see for anyone migrating to the new Oracle 11g Database. The focus of this presentation is new features that would be of interest to developers and includes: Flashback topics Database Replay SQL*Plus new commands New SQL Syntax Options Result Cache PL/SQL Enhancements including: New Compiler Options Triggers Dynamic SQL Dan is an experienced trainer and will illustrate many of the new features of the Oracle11 database that are of importance to developers. You will gain valuable insights into the many features of the latest version of Oracle 11g. A Q+A session with Dan Hotka will follow the presentation. For our complete archive, and to sign up for upcoming webinars please go to http://www.red-gate.com/oracle-webinars
Views: 7338 Redgate Videos
Efficient Function Calls From SQL (Part 4) : Scalar Subquery Caching vs PL/SQL Function Result Cache
 
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The fourth part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we compare Scalar Subquery Caching with the the Cross-Session PL/SQL Function Result Cache to see which we should use for best performance. For more information see: https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#scalar-subquery-caching-revisited Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Alex Gorbachev : Blog: http://www.oracloid.com/ Twitter: https://twitter.com/alexgorbachev Website: http://www.pythian.com/about/alex-gorbachev/ Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 1505 ORACLE-BASE.com
Webinar: All About the Function Result Cache
 
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Presented by Steven Feuerstein, Oracle Corporation The function result cache, added in Oracle Database 11g, offers developers a way to dramatically reduce the amount of time it takes to retrieve data requested repeatedly by database sessions (specifically, when the same rows of a table are fetched much more frequently than they are changed). This cache is stored in the SGA, shared across all sessions in the instance, and automatically purged of "dirty data" by the Oracle Database. Every application running on 11.1 or higher should be taking advantage of this feature. Best of all, there is minimal impact on your code to start using this feature.
Views: 1044 ODTUG
Clustered Indexes and DB Caching
 
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Second in the series of "Indexes on Index Cards", this video covers clustered index read operations and how the cache works on these operations in a relational database. Various queries and cache situations are covered, pointing out the logical and physical for each query and situation.
Views: 1397 Database by Doug
Curso de Oracle (Tuning) 06 - Data Dictionary Cache, UGA e Large Pool
 
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Curso Oracle PL/SQL Essentials http://bit.ly/1N3upVn Curso Oracle SQL Expert - Certificação 1Z0-047 http://bit.ly/1G4rKWG Curso Oracle Aprendendo SQL - Preparatório exames 1Z0-051/1Z0-061 http://bit.ly/1eqDlsr Curso de Administração de Redes de Computadores http://goo.gl/nXjaXS Neste curso de Tuning no Oracle você irá aprender os principais conceitos de tuning no oracle melhorando consideravelmente as aplicações em ambientes de produção. No Curso de Tuning no Oracle você será direcionado passo a passo durante o aprendizado com ótima qualidade do conteúdo disponibilizado. Este curso é oferecido gratuitamente aqui porém caso tenha interesse em se aprofundar e aprender o oracle a fundo praparando para certificação acesse os links acima. Também acesse o link de administração de redes de computadores para mais conhecimento nesta área tornando-se um profissional completo. http://youtu.be/4wEd1Qjj-Z8 Tags: Oracle Curso de Oracle Curso de banco de dados Tuning Cursos gratuitos
Views: 660 Cursos Interativos
Efficient Function Calls From SQL (Part 5) : Pipelined Table Functions
 
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The fifth part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we compare the performance of conventions table functions with pipelined table functions. For more information see: https://oracle-base.com/articles/misc/pipelined-table-functions https://oracle-base.com/articles/misc/efficient-function-calls-from-sql Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Mike Dietrich : Blog: https://blogs.oracle.com/UPGRADE Twitter: https://twitter.com/MikeDietrichDE Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 10956 ORACLE-BASE.com
Efficient Function Calls From SQL (Part 1) : Scalar Subquery Caching
 
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The first part of a mini-series of videos showing how you can improve the performance of function calls from SQL. In this episode, we take a look at Scalar Subquery Caching. For more information see: https://oracle-base.com/articles/misc/efficient-function-calls-from-sql#scalar-subquery-caching Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Bruno Borges : Blog: https://blogs.oracle.com/brunoborges/ Website: http://brunoborges.com/ Twitter: https://twitter.com/brunoborges Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 2279 ORACLE-BASE.com
Stored Procedure Optimization Techniques
 
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Kimberly will discuss stored procedure caching and the potential for performance problems due to a problem known as parameter sniffing. There are some common solutions and while they can drastically improve performance, they can also cause other problems. Sometimes a hybrid solution is needs, from this session, you’ll know the best way to write procedures so that stable requests are cached and unstable requests are not (giving you the most optimal performance without wasting resources). Kimberly Tripp Kimberly’s an author, consultant, and top-rated speaker having spoken at PASS, TechEd, SQLintersection, and numerous other events around the world; she’s also been a Microsoft SQL Server MVP for over 10 years. She has over 25 years of experience designing and tuning SQL Server solutions with a focus on optimizing procedural code, indexing strategies, statistics, and partitioning. When she's not tuning SQL servers, she's diving and photographing all sorts of underwater critters such as frogfish with her husband, Paul S. Randal.
Views: 5812 DBAFundamentals
Statement Execution and the Plan Cache  - Kimberly Tripp
 
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Kimberly will discuss the impact on caching / performance of different methods of statement execution. Briefly, she will also compare / contrast this with stored procedures. In the end, you’ll know the best way to request data so that stable requests are cached and unstable requests are not (giving you the most optimal performance). Kimberly L. Tripp is the founder/co-owner (with her husband, Paul Randal) of SQLskills.com, a world-renowned training and consulting company. She worked for Microsoft University and on the SQL Server team in the early 1990s but left to consult in 1995. Since then, she has been training, consulting, and speaking on a number of SQL Server areas with performance tuning, VLDBs, and optimization her most common topics. Kimberly is an accomplished writer and presenter with numerous top-speaker awards over the years; she is also a SQL Server MVP. You can read more at SQLskills.com. In her free time, and with her husband, Paul Randal, she likes diving, searching for critters, and underwater photography!
Views: 774 DBAFundamentals
Oracle SQL Tuning - How to Read Execution Plans (Explain Plan)
 
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In this free tutorial you will learn how to generate and read (interpret) an execution plan in Oracle Databases. See more FREE Oracle Tuning tutorials at http://skillbuilders.com/free-oracle-tutorials. Understanding what the Oracle Database does with your SQL is essential to tuning - and the execution plan is the key. Oracle Certified Master DBA John Watson will provide a brief introduction (4 minutes) - which includes John's tuning methodology, then demonstrate EXPLAIN PLAN, SQL*Plus AUTOTRACE and DBMS_XPLAN.DISPLAY_CURSOR. In the tutorial, John will teach you: - How to read an execution plan - Find the 1st step in the plan - Decipher the order of the steps in the plan - That EXPLAIN PLAN can be very misleading Prerequisites: To get the most from this tutorial, you should: 1 Know how to code SQL 2 Be familiar with SQL*Plus 3 Know - in very general terms - what an execution plan is. 4 Have a basic understanding of the Library Cache (this is where Oracle Database stores parsed SQL statements) 5 Have a basic understanding of the Cost Based Optimizer (this is the part of the database that parses your SQL, creates an execution plan. Hopefully the correct - most efficient - plan).
Views: 62385 SkillBuilders
Will huge Consistent Reads floods BUFFER CACHE?
 
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Video Blog on Oracle Real Time Activity regarding CACHE chains in BUFFER CACHE on Consistent Read operations. Looking for Oracle DBA training? WhatsApp/Contact: +919951696808 More training options at www.orskl.com/training
Views: 1923 OrSkl Academy
Oracle Architecture
 
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This video describes the best architecture of the oracle after trying more than times to Oracle structure I decided to produce an animated video let's start first with the database structure on the left side you have the client here on the right side you have to serve a two-year the server side is divided in three main structures to memory the logical structure and the physical structure so let's use SQL Plus application to provide you every step up a transaction will be using Scott sample schema it is important to note that the whole string is an alias and not a database name district will be compared to this alias inside of a file called pianist named doc or this file is similar to a DNS and with up pain all the necessary detail to reach a database server locally a user process will be allocated and will validate the connection through a listener the listener will be in charge to allocate a server process the user processes da link to the server process let's now execute our first transaction for this example we will execute an update first to state that will be validated we call this step the parsing this server process sense back to confirmation of the parsing that statement with be written into their share pool and the redo log buffer an execution plan will also be created it to the fair share Paul that database book they choose fought the transaction will be read and copy into the database buffer cache only that feel implicated in that transaction will be held it to a - segment till the transaction is completed we call those copies the before image a copy of this block will be duplicated with the updated feel this copy is called me after image a confirmation will be sent to to use a process the commit statement will complete the transaction and will be written into to redo log buffer to commit statement triggers the log writer process and we'll send all statement for the current transaction into the redo log file the before image into undo segment could be then deleted went that threshold up to undo retention parameters reach alaskan from Asian will be sent to the user process went to current law kiss Paul it generates a switch lock triggering at the same time the archiver process and to log sequence number the archiver will generate and archive the file with the content of the current loc a switch up with them trigger a checkpoint process that will incriminate the checkpoint number by applying this last number into each data file header the checkpoint process with finally trigger the database writer process enright the last image from that database buffer cache into thirty people
Views: 19692 Ezylearning
Reload data into cache automatically when data in the table changes   Part 132
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2013/02/reload-data-into-cache-automatically.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-132-reload-data-into-cache.html All ASP .NET Text Articles http://csharp-video-tutorials.blogspot.com/p/free-aspnet-video-tutorial.html All ASP .NET Slides http://csharp-video-tutorials.blogspot.com/p/aspnet-slides.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In Part 130 of asp.net video tutorial, we discussed about reloading data into cache automatically, when the xml file from which the data was initially retrieved, has changed. In this video, we will discuss about reloading data into cache automatically when data in the underlying database table has changed. Please watch Part 131, before proceeding with this video. To load data automatically into cache, when cached data is removed, we need to define a callback method. This callback method will be invoked when the respective item is removed from cache. So, the code to reload and re-cache data can be written in this method. The callback method signature should match, with the signature of "CacheItemRemovedCallback" delegate. The call back method is defined below. public void CacheItemRemovedCallbackMethod(string key, object value, CacheItemRemovedReason reason) { string CS = ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString; SqlConnection con = new SqlConnection(CS); SqlDataAdapter da = new SqlDataAdapter("spGetProducts", con); da.SelectCommand.CommandType = CommandType.StoredProcedure; DataSet ds = new DataSet(); da.Fill(ds); CacheItemRemovedCallback onCacheItemRemoved = new CacheItemRemovedCallback(CacheItemRemovedCallbackMethod); SqlCacheDependency sqlDependency = new SqlCacheDependency("Sample", "tblProducts"); Cache.Insert("ProductsData", ds, sqlDependency, DateTime.Now.AddHours(24), Cache.NoSlidingExpiration, CacheItemPriority.Default, onCacheItemRemoved); } Now, create an instance of "CacheItemRemovedCallback" delegate, and to the contructor pass the name of the callback method, that should be executed automatically when, the cached item is removed. CacheItemRemovedCallback onCacheItemRemoved = new CacheItemRemovedCallback(CacheItemRemovedCallbackMethod); In Part 131, to cache data, we used cache object's, Insert() method that takes 3 parameters, as shown below. Cache.Insert("ProductsData", ds, sqlDependency); Instead, let's use the overloaded version that takes 7 parameters and pass "onCacheItemRemoved" as an argument for "CacheItemRemovedCallback" parameter. Cache.Insert("ProductsData", ds, sqlDependency, DateTime.Now.AddHours(24), Cache.NoSlidingExpiration, CacheItemPriority.Default, onCacheItemRemoved); That's it. We are done. Now, please run the application. When "Get Data" button is clicked for the first time, the data is loaded from database. Once the data is loaded into cache, we always get it from cache when we click "Get Data". Now, execute an update statement on the database table. Notice that, when we click "Get Data" button now, we still get data from cache, but notice that, the updated data is loaded.
Views: 37149 kudvenkat
How Oracle SQL Query Process
 
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For complete professional training visit at: http://www.bisptrainings.com/course/Oracle-Fundamentals-and-PL-SQL-for-beginners Follow us on Facebook: https://www.facebook.com/bisptrainings/ Follow us on Twitter: https://twitter.com/bisptrainings Email: [email protected] Call us: +91 975-275-3753 or +1 386-279-6856
Views: 22913 Amit Sharma
Top 10 Entity Framework Features Every Developer Should Know (Web 106)
 
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Entity Framework (EF) has been making light work of data access, and it just keeps getting better with every release. EF Core improved many features from prior versions, as well as introduced brand new features. In this session, I cover the top 10 features of Entity Framework Core that every developer should know. Instructor: Philip Japikse (LinkedIn Learning & Microsoft MVP)
ObjectStudio and Oracle Statement Caching
 
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How to set up statement caching for your Oracle db access with ObjectStudio 8
Views: 26 jarober
Sequence object in SQL Server 2012
 
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create sequence in sql server In this video we will discuss sequence object in SQL Server. Sequence object Introduced in SQL Server 2012 Generates sequence of numeric values in an ascending or descending order Text version of the video http://csharp-video-tutorials.blogspot.com/2015/10/sequence-object-in-sql-server-2012.html Slides http://csharp-video-tutorials.blogspot.com/2015/10/sequence-object-in-sql-server-2012_26.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists Creating the Incrementing Sequence : The following code create a Sequence object that starts with 1 and increments by 1 CREATE SEQUENCE [dbo].[SequenceObject] AS INT START WITH 1 INCREMENT BY 1 Generating the Next Sequence Value : Now we have a sequence object created. To generate the sequence value use NEXT VALUE FOR clause SELECT NEXT VALUE FOR [dbo].[SequenceObject] Output : 1 Every time you execute the above query the sequence value will be incremented by 1. I executed the above query 5 times, so the current sequence value is 5. Retrieving the current sequence value : If you want to see what the current Sequence value before generating the next, use sys.sequences SELECT * FROM sys.sequences WHERE name = 'SequenceObject' Alter the Sequence object to reset the sequence value : ALTER SEQUENCE [SequenceObject] RESTART WITH 1 Select the next sequence value to make sure the value starts from 1 SELECT NEXT VALUE FOR [dbo].[SequenceObject] Using sequence value in an INSERT query : CREATE TABLE Employees ( Id INT PRIMARY KEY, Name NVARCHAR(50), Gender NVARCHAR(10) ) -- Generate and insert Sequence values INSERT INTO Employees VALUES (NEXT VALUE for [dbo].[SequenceObject], 'Ben', 'Male') INSERT INTO Employees VALUES (NEXT VALUE for [dbo].[SequenceObject], 'Sara', 'Female') -- Select the data from the table SELECT * FROM Employees Creating the decrementing Sequence : The following code create a Sequence object that starts with 100 and decrements by 1 CREATE SEQUENCE [dbo].[SequenceObject] AS INT START WITH 100 INCREMENT BY -1 Specifying MIN and MAX values for the sequence : Use the MINVALUE and MAXVALUE arguments to specify the MIN and MAX values respectively. Step 1 : Create the Sequence object CREATE SEQUENCE [dbo].[SequenceObject] START WITH 100 INCREMENT BY 10 MINVALUE 100 MAXVALUE 150 Step 2 : Retrieve the next sequence value. The sequence value starts at 100. Every time we call NEXT VALUE, the value will be incremented by 10. SELECT NEXT VALUE FOR [dbo].[SequenceObject] If you call NEXT VALUE, when the value reaches 150 (MAXVALUE), you will get the following error The sequence object 'SequenceObject' has reached its minimum or maximum value. Restart the sequence object to allow new values to be generated. Recycling Sequence values : When the sequence object has reached it's maximum value, and if you want to restart from the minimum value, set CYCLE option ALTER SEQUENCE [dbo].[SequenceObject] INCREMENT BY 10 MINVALUE 100 MAXVALUE 150 CYCLE At this point, whe the sequence object has reached it's maximum value, and if you ask for the NEXT VALUE, sequence object starts from the minimum value again which in this case is 100. To improve performance, the Sequence object values can be cached using the CACHE option. When the values are cached they are read from the memory instead of from the disk, which improves the performance. When the cache option is specified you can also specify the size of th cache , that is the number of values to cache. The following example, creates the sequence object with 10 values cached. When the 11th value is requested, the next 10 values will be cached again. CREATE SEQUENCE [dbo].[SequenceObject] START WITH 1 INCREMENT BY 1 CACHE 10 Using SQL Server Graphical User Interface (GUI) to create the sequence object : 1. Expand the database folder 2. Expand Programmability folder 3. Right click on Sequences folder 4. Select New Sequence Next video : Difference between SEQUENCE and IDENTITY in SQL Server
Views: 33176 kudvenkat
Statement Caching with VisualWorks and Oracle
 
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How to use statement caching with VW and Oracle
Views: 25 jarober
Voting disk
 
08:00
Views: 6029 kathyaini tutorials
Redo Logs in an Oracle Database - DBArch Video 11
 
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This video explains the concepts of Redo Log Groups and Files in an Oracle Database. You will understand how Oracle Instance uses Redo Buffers and Logwriter to keep the redo in Redo Logs. Our Upcoming Online Course Schedule is available in the url below https://docs.google.com/spreadsheets/d/1qKpKf32Zn_SSvbeDblv2UCjvtHIS1ad2_VXHh2m08yY/edit#gid=0 Reach us at [email protected]
Views: 12892 Ramkumar Swaminathan
Oracle tutorial : How to create Id with AUTO INCREMENT in Oracle PL SQL
 
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Oracle tutorial: How to create Id with AUTO INCREMENT in Oracle oracle tutorial for beginners sequence in oracle identity key in sql In this Oracle tutorial , we can create an auto increment field using ‘sequence’ object that can be assigned as primary keys. Using Oracle ‘sequence’ object, you can generate new values for a column. An Oracle sequence is an object like a table or a stored procedure. Examples CREATE SEQUENCE SYSTEM.MYSEQ START WITH 1 MAXVALUE 999999999999999999999999999 MINVALUE 1 NOCYCLE CACHE 20 NOORDER; CREATE OR REPLACE TRIGGER TR_CITY BEFORE INSERT ON CITY FOR EACH ROW BEGIN SELECT LPAD(LTRIM(RTRIM(TO_CHAR(myseq.NEXTVAL))),10,'0') INTO :NEW.id FROM DUAL; END; / Subscribe on youtube: https://www.youtube.com/channel/UCpiyAesWNYOXSz5GPq8lbkA For more tutorial please visit #techquerypond https://techquerypond.wordpress.com https://twitter.com/techquerypond
Views: 8477 Tech Query Pond
Crash Recovery in Oracle RAC - DBArch Video 16
 
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In this video you will understand how an Oracle RAC cluster recovers from an Instance Crash which is also called Crash Recovery. The video will use the whiteboard to show you what happens when one of the nodes crashes in a Cluster and how the surviving node recovers the failed node related transactions. Our Upcoming Online Course Schedule is available in the url below https://docs.google.com/spreadsheets/d/1qKpKf32Zn_SSvbeDblv2UCjvtHIS1ad2_VXHh2m08yY/edit#gid=0 Reach us at [email protected]
Views: 9885 Ramkumar Swaminathan
Flush particular SQL Statement from Shared Pool
 
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Flush Execution Plan in Oracle 11g, Flush sql_statement from shared pool in Oracle 11g,
Views: 810 Athar Fahad
Continuous Query Notification for the node-oracledb Driver
 
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Held in June 2018 Christopher Jones, Dan McGhan and Anthony Tuininga review some of the latest features of the node-oracledb Node.js driver and answer user's questions, and in particular offer an overview of the new APIs and demonstrate how they work. Native support for Oracle Database Continuous Query Notification (CQN) has landed in the node-oracledb master branch on GitHub. CQN allows an application to register queries with the database so the database can notify the application if the objects in the query or query result change. In this office hours, we'll provide an overview of the new APIs and demonstrate how they work. AskTOM Office Hours offers free, monthly training and tips on how to make the most of Oracle Database, from Oracle product managers, developers and evangelists. https://asktom.oracle.com/ Oracle Developers portal: https://developer.oracle.com/ Sign up for an Oracle Cloud trial: https://cloud.oracle.com/en_US/tryit music: bensound.com
Views: 124 Oracle Developers
Cache Management - Design of Computer Programs
 
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This video is part of an online course, Design of Computer Programs. Check out the course here: https://www.udacity.com/course/cs212.
Views: 796 Udacity
How to Delete the Duplicate Records in oracle
 
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http://oracletemple.blogspot.in/ How to Delete the duplicate records How delete the duplicate rows ? Tips: - Always take extra caution while deleting records. 1. First identify the duplicates using select. 2. Double verify those are actual ‘duplicates’ or not 3. Take backup if necessary 4. Apply commit only if you are sure. -~-~~-~~~-~~-~- Please watch: "difference between delete and truncate" https://www.youtube.com/watch?v=7b6wQ3Qumgg -~-~~-~~~-~~-~- ------------------------------------------------------------------ Below is link for Useful Pl/SQL Books http://goo.gl/XMy0tt ---------------------------------------------------------- Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 21420 Ram Gupta
Oracle - SQL - Creating Sequences
 
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Oracle - SQL - Creating Sequences Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Anadi Sharma, Tutorials Point India Private Limited.
Statement Execution and the Plan Cache by Kimberly L  Tripp
 
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Statement Execution and the Plan Cache by Kimberly L Tripp
How an intense and diverse SQL statement workload can cause Oracle parsing problems
 
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Make your library cache angry! This video is about how an intense and diverse SQL statement workload can cause Oracle parsing problems. There are many reasons for Oracle parsing related performance issues and many ways to identify them. So, I am narrowing the scope by focusing on one possible cause, that is, an intense and diverse SQL statement workload. I will use Oracle's wait interface to identify the root cause. Sound dry and boring? To make this a little more interesting and a whole lot more fun, I'm going to approach this from a non-traditional, almost backward perspective. After explaining some of the Oracle internals, I'm going to create a parsing intensive workload and then watch what happens... in real time. The educational impact is so powerful, I recorded a video This is video is part of Craig's blog post: http://blog.orapub.com/20170126/how-an-intense-and-diverse-sql-workload-causes-oracle-parsing-problems.html For more information go to www.orapub.com
Views: 270 OraPub, Inc.
How to: Execute selected sql statement
 
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Working with multiple SQL Statements in Cache Monitors SQL Editor. Caché Monitor is a tool for InterSystems database Caché. Download: http://www.cachemonitor.de/download-2/
Views: 939 Andreas Schneider
How to: query data from three servers in one SQL
 
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This video shows how to query data from a MS SQL Server and two InterSystems Caché Servers in ONE sql statement. The example statement JOINs five tables: three tables from the Adventure Works database and one table on each Caché Server. Download: http://www.cachemonitor.de/download-2/
Views: 2169 Andreas Schneider
Oracle Exadata Smart Scan - Limitations and Best Practices
 
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Smart Scan is a wonderful capability, but you don't always get it. It's impossible for many execution plans, and this is a major restriction. If you think about what a Smart Scan actually does, it delivers individual columns, individual rows back to the instance. Now, a buffer cache can accept only blocks. Therefore, Smart Scan cannot possibly put those columns of rows into the buffer cache. It's simply not formatted appropriately. So, a Smart Scan has to return values directly into the session's PGA or, to put it another way, the only access method that can use Smart Scan is direct read. Well, what access methods can use direct read? There are only two, which are table full scan and index fast full scan. Any other access method, typically index range scan, table access by row ID, cannot use a Smart Scan. The second major issue, there are strict limitations of the type of objects that can be accessed through Smart Scan. It really is only heap tables. You can't use indexes. You can't use clusters. You can't use IOTs. Heap tables only. Perhaps hardest to track down and giving sometimes very erratic results is that Smart Scan can be interrupted by various conditions. You've met all the requirements for Smart Scan, directory and so on, got the right execution plan. The Smart Scan starts and then hits something that causes a problem. Issues that we know cause problems are, for instance, read consistency, also delayed block cleanout, change rows. Any of those issues and a few others mean that the storage tier will have to interrupt its Smart Scan, deliver complete blocks into that buffer cache, let your session then do what is necessary to the block, and only then can the Smart Scan proceed. Now, in order to maximize the use of Smart Scan, there may be quite a lot of work. Very often, you'll have to adjust your index structures. Making them invisible is a nice technique there. There are many, many, many parameters that can influence the likelihood of achieving a Smart Scan, and almost inevitably you're going to be rewriting a lot of hint SQL and putting hints in it to get the correct execution plans that can enable a Smart Scan to occur. This is all because of one fundamental problem; the optimizer is not in any way aware of the Exadata. The optimizer develops an execution plan in exactly the way it would without the Exadata storage. The use of Smart Scan, the awareness of Exadata comes at the next level down. The optimizer develops the plan through a normal pass and then passes it through to the SQL execution engine, and it's the SQL execution engine that determines, on a case-by-case basis, whether to use the Smart Scan. This means that you might develop a plan and execute the statement 50 times. Forty-nine times, you get a Smart Scan. The 50th time, for whatever reason, the SQL execution engine decides not to. This can result in somewhat erratic performance.
Views: 1623 SkillBuilders
How Oracle database does instance recovery after failures
 
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A real time activity to demonstrate how Oracle database performs automatic instance recovery after a failure. This video blog will take a real example to prove the concepts in reality. Need DBA training? Whatsapp : +919951696808 More blogs at https://www.orskl.com
Views: 1739 OrSkl Academy
How to Delete Java Cache in Windows 7
 
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In this tutorial, we will guide you some basic techniques through which you can remove Java cache and clean up your computer. Don't forget to check out our site http://howtech.tv/ for more free how-to videos! http://youtube.com/ithowtovids - our feed http://www.facebook.com/howtechtv - join us on facebook https://plus.google.com/103440382717658277879 - our group in Google+ Java Cache refers to small cache files which contain information about Java. These files are stored in your computer whenever you visit a webpage that has Java Script in it. Windows automatically stores website's Java details and other settings in the form of a cache on your computer. This helps the browser load the Java enabled webpage easily next time you open it. It is also recommended that Java Cache be deleted periodically so that Windows can store the latest and updated Java details. Follow this step by step guide to learn how to delete Java cache in Windows 7. Step # 1 -- Open up the 'Java Settings' Panel In this tutorial, we will guide you on how to delete Java cache in Windows 7. For this purpose, go to the "Start Menu" and click on the "Control Panel" option to open its window. Now click on the "Java" option from the Control Panel to open its 'Tools and Settings' panel. Step # 2 -- Open Java Settings Once you have opened the Java Control Panel, go to the "General" tab. In this tab, click on the "Settings" button which is located at the bottom of the Panel. Step # 3 -- Delete all Files Once you have opened the "Settings" panel, a new window will open in front of your screen. In this window, click on the "Delete Files" button to proceed with the process of Java cache delete from your computer system. Step # 4 -- Select 'All files' to delete In the last step of Java cache delete process, select all options to enable them and click on the "OK" button to remove all Java cache files completely.
SCPT 21: Oracle Back Ground Processes ( CKPT, DBWR, LGWR, ARCH)
 
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Oracle DBA Tutorials For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=6 Full Course Experience Includes 1. Access to course videos and exercises 2. View & manage your progress/pace 3. In-class projects and code reviews 4. Personal guidance from your Mentors
Views: 58376 Oresoft LWC
How to invoke oracle plsql function from jsp.
 
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This oracle tutorial is about calling a function from Oracle database 12c release 1 from JSP module without using select statement. Only two object is used. One connection object and another callable statement object.
Views: 1535 Subhroneel Ganguly

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