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Global Index rebuild scenario in Oracle Database 11g
 
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Why and How we need to rebuild global Index in Oracle 11g
Views: 3196 Athar Fahad
Oracle Indexes - Beginner
 
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Oracle Indexes - Beginner
Views: 65854 Chris Ostrowski
How to Move Object from one Table Space to Another Table Space? | How to Rebuild the Index ?
 
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This Video will teach you How to Move Object one Table Space to Another | How to Rebuild the Index ? move table from one tablespace to another in oracle 11g oracle move schema to another tablespace oracle how to move objects to another tablespace oracle 11g move schema to another tablespace alter table move tablespace oracle 8i oracle move table script oracle move cluster to new tablespace oracle move table example rebuild index oracle script alter index rebuild online parallel oracle rebuild all indexes oracle index rebuild online vs offline oracle rebuild partitioned index index rebuild oracle best practice index rebuild script in oracle 11g
Views: 986 Oracle PL/SQL World
Index Rebuild vs. Reorganize
 
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Some of my thoughts about performing either, or any at all. In some cases, I won't use indexes.
Views: 4242 SQLInSix Minutes
Local Vs Global Partitioned Index in Oracle 11g
 
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The Video Explains the difference between Local Partitioned Indexes(Prefixed vs Non Prefixed Indexes). and Global Partitioned Index along with the challenges in maintaining Global partitioned Indexes when the underlying tables partitioned is dropped/truncated/Merged/Moved. Local Partitioned Index Shares the same boundaries as the table and are in the same number as table partitions they are widely used in DSS and DWH systems. While Global Partitioned Index are predominantly used in OLTP systems
Views: 6625 Tech Coach
Oracle Performance Tips - Indexes
 
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Learn about index and types of indexes.
Views: 2218 Saurabh Kumar
Reorganizing Tables in Oracle
 
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The clip explains why reorganizing of tables may or may not be required and how to do it. Text version is here: https://uhesse.com/2010/08/23/reorganizing-tables-in-oracle-is-it-worth-the-effort/
Oracle || Indexes Part-1 by dinesh
 
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DURGASOFT is INDIA's No.1 Software Training Center offers online training on various technologies like JAVA, .NET , ANDROID,HADOOP,TESTING TOOLS ,ADF,INFORMATICA,TABLEAU,IPHONE,OBIEE,ANJULAR JS, SAP... courses from Hyderabad & Bangalore -India with Real Time Experts. Mail us your requirements to [email protected] so that our Supporting Team will arrange Demo Sessions. Ph:Call +91-8885252627,+91-7207212428,+91-7207212427,+91-8096969696. http://durgasoft.com http://durgasoftonlinetraining.com https://www.facebook.com/durgasoftware http://durgajobs.com https://www.facebook.com/durgajobsinfo......
Oracle SQL Tutorial 21 - How to Create / Drop Indexes
 
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In the last video, we wrote up the SQL to create three tables: CREATE TABLE users( user_id NUMBER, username VARCHAR2(50 CHAR) UNIQUE, CONSTRAINT users_pk PRIMARY KEY (user_id) ); CREATE TABLE projects( project_id NUMBER, Project_name VARCHAR2(50 CHAR) UNIQUE, creator VARCHAR2(50 CHAR) NOT NULL, CONSTRAINT projects_pk PRIMARY KEY (project_id), CONSTRAINT projects_users_fk FOREIGN KEY (creator) REFERENCES users (username) ON DELETE CASCADE ); CREATE TABLE project_users( project_id NUMBER NOT NULL REFERENCES projects (project_id) ON DELETE CASCADE, user_id NUMBER NOT NULL REFERENCES users (user_id) ON DELETE CASCADE, CONSTRAINT project_users_pk PRIMARY KEY (project_id, user_id) ); I'm going to increase the size of the users table a bit by adding a first and last name column. CREATE TABLE users( user_id NUMBER, username VARCHAR2(50 CHAR) UNIQUE, first_name VARCHAR2(50 CHAR), last_name VARCHAR2 (50 CHAR), CONSTRAINT users_pk PRIMARY KEY (user_id) ); But before we finish this design, we should consider indexing certain columns. What columns should we index? Well, as a reminder, the columns that are indexed by default are columns with the UNIQUE constraint, and those that are labeled as primary keys. Columns that are not indexed but often should be are those labeled as a foreign key. The column that jumps out the most to me is the creator column of the project table. It's the only foreign key that is not part of some index. Let's fix this by creating our first index. The way we do that is with the CREATE INDEX command. CREATE INDEX projects_creator_ix ON projects (creator) What naming convention are we following for the index? We are naming it by the table name, followed by an underscore, followed by the column, followed by an underscore, followed by an ix (for index). In this situation it does not apply, but if our foreign key column is labeled as UNIQUE, we can add the UNIQUE keyword like this: CREATE UNIQUE INDEX projects_creator_ix ON projects (creator) Now if you want to get rid of an INDEX, you can use this command: DROP INDEX projects_creator_ix Now, if we want to select data from the user table and the project table we can do that much faster. That's because the foreign key and column it references are both indexed and those are the columns we would do the join on. We will discuss how to do joins in a future video. So what are some potential problems with this database design? Overall, it is pretty good. With this design though we need to make sure there is no way for someone to update a user's username. In the next video we are going to discuss why. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Support me on Patreon! http://www.patreon.com/calebcurry Subscribe to my newsletter: http://bit.ly/JoinCCNewsletter Donate!: http://bit.ly/DonateCTVM2. ~~~~~~~~~~~~~~~Additional Links~~~~~~~~~~~~~~~ More content: http://CalebCurry.com Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://twitter.com/calebCurry Amazing Web Hosting - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 8917 Caleb Curry
TSQL: Rebuild All Indexes For All Tables (Faster)
 
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Will rebuild all indexes for all tables in a database and is much faster than the former video with the WHILE loop.
Views: 1805 SQLInSix Minutes
07 04 Index Column Order Matters
 
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ORACLE
Views: 102 oracle ocm
TSQL: Rebuild All Indexes In A Database
 
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TSQL – Rebuild All Indexes https://www.fintekdev.com/tsql-rebuild-all-indexes/ (sponsored post) (Using Microsoft SQL Server 2008R2)
Views: 8495 SQLInSix Minutes
SQL Server tutorial 81: Rebuilding Indexes
 
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How to rebuild an index with SSMS or T-SQL. For more info, or a copy of any of the scripts used in any of my tutorials, please email me at [email protected]
Views: 13154 Johnny Deluca
How to Shrink table in Oracle..
 
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this video will help how to reclaim space from the table.
Views: 1810 oracdb
Stop Rebuilding Global Indexes! Oracle 12c Global Index Maintenance
 
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Stop rebuilding Global Indexes! Stop worrying about invalidating Global Indexes! Oracle 11g gave us "UPDATE GLOBAL INDEXES". 12c provides a huge improvement: orphaned_entries! In this tutorial, Oracle Certified Master John Watson demonstrates how 11g and 12c handle Global Index maintenance with orphaned entries and overnight maintenance job PMO_DEFERRED_GIDX_MAINT_JOB.
Views: 2473 SkillBuilders
Table Shrinking in Oracle Database
 
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1.Shrink the Table: Shrinking is started from 10g. In this method I’m using user u1 and table name sm1. Now I’m deleting some rows in sm1 COUNT ---------- 1048576 Table sm1 has 1048576 rows. [email protected]: delete from sm1 where deptno=10; 262144 rows deleted. I deleted above number of rows. Rows COUNT ---------- 786432 And I’m giving commit [email protected]: commit; Commit complete. So now we have 786432 rows in sm1 table. Now see the following command [email protected]: select OWNER,TABLESPACE_NAME,SEGMENT_NAME,SEGMENT_TYPE,BYTES/1024/1024||' mb'"space",BLOCKS,EXTENTS from dba_segments where tablespace_name like 'U%TS'; OWNER TABLESPACE_NAME SEGMENT_NAME SEGMENT_TYPE space BLOCKS EXTENTS ----- --------------- ------------- ------------- ------ ---------- ---------- U1 U1TS SM1 TABLE 29 mb 3712 44 After I deleted some rows in sm1 table still above result showing same values, so now our duty is shrink this table. This is done by following 2 ways, i By using COMPACT key word: In this method shrinking is done in two phases. In the first phase all fragmented space are just defragmented, but still the High Water Mark is persist with last used block only. That mean used free blocks are not de allocated and HWM is not updated here. Issue the following command before use shrink command. [email protected] alter table sm1 enable row movement; Table altered. There is particular use with above command, when we shrink the table all rows are moves to contiguous blocks, so here row movement should be done. By default the row movement is disabled for any table, so above command enabled the row movement. Then execute shrink command now. [email protected]: alter table sm1 shrink space compact; Table altered. Now see the space of table by using below command. [email protected]: select OWNER,TABLESPACE_NAME,SEGMENT_NAME,SEGMENT_TYPE,BYTES/1024/1024||' mb'"space",BLOCKS,EXTENTS from dba_segments where tablespace_name like 'U%TS'; OWNER TABLESPACE_NAME SEGMENT_NAME SEGMENT_TYPE space BLOCKS EXTENTS ----- --------------- ------------- ------------- ------ ---------- ---------- U1 U1TS SM1 TABLE 29 mb 3712 44 So here seems nothing happened with above shrink command, but internally the fragmented space is defragmented. But the high water mark is not updated, used free blocks are also not de allocated. For de allocating the used blocks we have to execute below command. This is the second phase. [email protected]: alter table sm1 shrink space; Table altered. Now see the space by using below command. [email protected]: select OWNER,TABLESPACE_NAME,SEGMENT_NAME,SEGMENT_TYPE,BYTES/1024/1024||' mb'"space",BLOCKS,EXTENTS from dba_segments where tablespace_name like 'U%TS'; OWNER TABLESPACE_NAME SEGMENT_NAME SEGMENT_TYPE space BLOCKS EXTENTS ----- --------------- ------------- ------------- ---------- ---------- ---------- U1 U1TS SM1 TABLE 20.8125 mb 2664 36 So now the space of sm1 table is reduced. Note: Actually the alter table sm1 shrink space command will complete these two phases of the shrinking of table at a time. But here we done shrink process in two phases because when we use alter table sm1 shrink space command the table locked temporarily some time period, during this period users unable to access the table. So if we use alter table sm1 shrink space compact command the table is not locked but space is defragmented. When we not in business hours issue the second phase shrink command then users are won’t get any problem. ii Because of above method the table dependent objects are goes to invalid state, to overcome this problem we have to use below command. [email protected]: alter table sm1 shrink space cascade; Table altered. The above command also shrinks the space of all dependent objects. We also do this in two phases like above two phases. See the below command. [email protected]: alter table sm1 shrink space compact cascade; Table altered. And then [email protected]: alter table sm1 shrink space cascade; Table altered. Transporting tablespace to different platform by Using RMAN : https://www.youtube.com/watch?v=CN401PUKK4A Oracle EBS apps Upgrade from 12 2 to 12 2 5 (start CD 51) : https://www.youtube.com/watch?v=zeO4goqR70Y Transport tablespace by using RMAN.: https://www.youtube.com/watch?v=YG6kWX7Par8
Views: 6945 BhagyaRaj Katta
Index Fragmentation  Internals, Analysis, and Solutions
 
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As soon as you have more than one index on a table, you’re going to start seeing fragmentation. Many people know that this fragmentation is bad, but why is it bad? And what is the best way to get rid of it? Come find out from the person who wrote the tools for detecting and removing index fragmentation. In this session, you’ll learn how fragmentation occurs and why the process that leads to it can often be as damaging to performance as the fragmentation itself. You’ll also learn how to test for fragmentation, the different methods of removing it, and everything you need to consider when putting together an appropriate fragmentation-management strategy. CEO / Owner Paul is a Microsoft SQL Server MVP and a Microsoft Regional Director. He spent 9 years working on the SQL Server team, writing DBCC CHECKDB, and ultimately responsible for the entire Storage Engine. In 2007 Paul left Microsoft to co-own and run SQLskills.com, and is a world-renowned author, consultant, and top-rated speaker on SQL Server performance tuning, administration, internals, and HA/DR. When he's not tweeting, blogging, or helping someone recover from a disaster, he's likely to be underwater somewhere in the world with his wife, Kimberly L. Tripp.
Views: 5546 DBAFundamentals
SQL Server 34 - How to Create and Drop Indexes
 
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Creating indexes is a very easy task, but before you go creating indexes on everything, you need to know that some columns are indexed by default. Specifically, any column that is labeled as the PRIMARY KEY or UNIQUE are indexed by default. That means that if you have a UNIQUE column, you do not need to worry about adding an INDEX to it. The columns that you will want to pay special attention to are any foreign keys or columns that you are going to use very frequently. We are going to create an index on our SpeciesID column in our Animals table. This is a foreign key that I'm likely going to use very frequently. CREATE INDEX IX_AnimalsSpecies ON Animals (SpeciesID); The syntax is very similar to CREATE TABLE in that you say CREATE INDEX followed by an index name. The IX_ is a prefix that is sometimes conventionally used to name indexes. Next, we have the table name, and then we have something to describe the column. That way if you see IX_AnimalsSpecies, you automatically know it is talking about an Index for the Animals table that is on the column dealing with the species. To get rid of this index, use this: DROP INDEX IX_AnimalsSpecies; Which is also very similar to how we drop a table. Now, you can also create an INDEX on multiple columns if you are going to use them together very often. The way you do that is just add another column after a comma inside of the () in the index columns. For example: CREATE INDEX IX_AnmialsContact ON Animals (Name, ContactEmail); One other thing I wanted to show you is that you can actually create a UNIQUE Index by adding the keyword in: CREATE UNIQUE INDEX IX_Species ON Species (Species); This should only be used if every value for a column is labeled unique…In fact, it forces every row to be unique. Remember though that if a column is labeled UNIQUE, it is indexed by default...So this is not needed in this situation. In the next video we will discuss in more detail whether you want to use the UNIQUE Constraint create a UNIQUE index. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Support me! http://www.patreon.com/calebcurry Subscribe to my newsletter: http://bit.ly/JoinCCNewsletter Donate!: http://bit.ly/DonateCTVM2. ~~~~~~~~~~~~~~~Additional Links~~~~~~~~~~~~~~~ More content: http://CalebCurry.com Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://twitter.com/calebCurry Amazing Web Hosting - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 8700 Caleb Curry
What is High Water Mark(HVM) in oracle and how it effects the performance of queries?
 
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This video tutorial is to understand the concept of a High Water Mark or HVM of a oracle table, also it states the various changes in the HVM when we perform a insert, delete and Truncate operation on the table, and the video also informs why is the truncate operation more advisable and optimized then the delete operation.
Views: 3567 Kishan Mashru
01 Overview of table Partition in oracle
 
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Partitioning enhances the performance, manageability, and availability of a wide variety of applications and helps reduce the total cost of ownership for storing large amounts of data. Partitioning allows tables, indexes, and index-organized tables to be subdivided into smaller pieces, enabling these database objects to be managed and accessed at a finer level of granularity. Oracle provides a rich variety of partitioning strategies and extensions to address every business requirement. Moreover, since it is entirely transparent, partitioning can be applied to almost any application without the need for potentially expensive and time consuming application changes. Partitioning allows a table, index, or index-organized table to be subdivided into smaller pieces, where each piece of such a database object is called a partition. Each partition has its own name, and may optionally have its own storage characteristics. From the perspective of a database administrator, a partitioned object has multiple pieces that can be managed either collectively or individually. This gives the administrator considerable flexibility in managing partitioned objects. However, from the perspective of the application, a partitioned table is identical to a non-partitioned table; no modifications are necessary when accessing a partitioned table using SQL queries and DML statements. Partitioning Key ======================== Each row in a partitioned table is unambiguously assigned to a single partition. The partitioning key is comprised of one or more columns that determine the partition where each row will be stored. Oracle automatically directs insert, update, and delete operations to the appropriate partition through the use of the partitioning key. When to Partition a Table ========================== Here are some suggestions for when to partition a table: Tables greater than 2 GB should always be considered as candidates for partitioning. Tables containing historical data, in which new data is added into the newest partition. A typical example is a historical table where only the current month's data is updatable and the other 11 months are read only. When the contents of a table need to be distributed across different types of storage devices. When to Partition an Index ============================= Here are some suggestions for when to consider partitioning an index: Avoid rebuilding the entire index when data is removed. Perform maintenance on parts of the data without invalidating the entire index. Reduce the impact of index skew caused by an index on a column with a monotonically increasing value. Partitioned Index-Organized Tables =================================== Partitioned index-organized tables are very useful for providing improved performance, manageability, and availability for index-organized tables. For partitioning an index-organized table: ============================================ Partition columns must be a subset of the primary key columns Secondary indexes can be partitioned (both locally and globally) OVERFLOW data segments are always equi-partitioned with the table partitions See Also: Oracle Database Concepts for more information about index-organized tables System Partitioning System partitioning enables application-controlled partitioning without having the database controlling the data placement. The database simply provides the ability to break down a table into partitions without knowing what the individual partitions are going to be used for. All aspects of partitioning have to be controlled by the application. For example, an insertion into a system partitioned table without the explicit specification of a partition will fail. System partitioning provides the well-known benefits of partitioning (scalability, availability, and manageability), but the partitioning and actual data placement are controlled by the application. See Also: Oracle Database Data Cartridge Developer's Guide for more information about system partitioning Partitioning for Information Lifecycle Management Information Lifecycle Management (ILM) is concerned with managing data during its lifetime. Partitioning plays a key role in ILM because it enables groups of data (that is, partitions) to be distributed across different types of storage devices and managed individually.
Views: 7185 Md Arshad
Oracle Performance - DBMS_STATS
 
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Oracle Performance - DBMS_STATS
Views: 4456 The Silent DBA
Intuition Behind Oracle Index
 
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How index helps in performance 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: 13919 Oresoft LWC
Frgmentation in oracle database
 
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Fragmentation in oracle database,find and defragmentation
Views: 3933 Sainora Annanagar
INDEX PARTITIONING oracle
 
50:56
index partioning in oracle
Views: 360 oracle dba tutorial
【VDEDU】Unusable indexes use
 
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Unusable indexes in Oracle, DML statements are not use the index to its maintenance, at the same time the optimizer will not use the index. Unusable indexes no segment exists. Unavailable index index becomes available methods are: 1. Place the index can not be truncate operation corresponding table; 2.rebuild index; In addition, the query optimizer can use conversion method expand table so that the SQL statement has encountered unusable index partition table to generate better execution plans.
Views: 65 崔旭
SQL: When to Rebuild SQL Index
 
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This video will provide you a tutorial on when to rebuild or reorganize a SQL Index. If an index is fragmented greater than 35% then you will want to rebuild else if it is between 5% and 35% then you will want to reorganize the index. Github Script: https://github.com/ProfessorPitch/ProfessorPitch/tree/master/SQL/Indexes Microsoft Documentation: https://docs.microsoft.com/en-us/sql/relational-databases/indexes/reorganize-and-rebuild-indexes?view=sql-server-2017
Views: 42 ProfessorPitch
Online Index Rebuild
 
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Webcast created by Sotiris Karras
Oracle Partitioning
 
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Oracle Partitioning watch more videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjab, Tutorials Point India Private Limited
Oracle Performance - Indexes
 
28:28
Oracle Performance - Indexes
Views: 271 The Silent DBA
FRAGMENTATION
 
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Horizontal Fragmentation, Vertical Fragmentation and Hybrid Fragmentation...
Views: 5358 sivan kamil
SQL Index - Compare a clustered index vs a non clustered index
 
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http://sqlserver2008tutorial.com/ In this video training, we compare SQL indexes -- clustered index vs. non clustered index. In SQL server you can have one clustered index whereas you can have many non clustered index is. Using SQL Server Profiler and MS SQL Execution plans, we compare the clustered index and the nonclustered index. In this demo we show you how to create a clustered and non-clustered index using SSMS. Using different parameters like CPU, Number of Page Reads and Duration in msec, we come to a conclusion that the best option is to use a clustered index. Finally we go over index management and index fragmentation. We illustrate ALTER TABLE commands with Index Rebuild or Index Reorg. Other topics that we cover include a table scan; clustered index scan and an index seek.
Views: 50840 baghul
Oracle Indexes - Live Demonstration
 
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When is a Full Table Scan faster than an Index Scan? Watch Ross and Jordan act out an Oracle database reading and caching data via both methods, explaining the costs and benefits in simple and easy to understand terms. The demonstration is part of a talk by Ross Leishman of DWS Ltd on the principles of Understanding Indexes for SQL Tuning. The full lecture is at this link: https://www.youtube.com/watch?v=Z4hKomnGHFA DWS Ltd is a leading publicly listed Australian IT Services company, providing services to blue chip organisations since 1991. With a business philosophy based upon integrity, reliability and professional service delivery, DWS provides end to end IT solutions. www.dws.com.au
Views: 2693 DWS Ltd
How Many Indexes Are Too Many?: Finding All The Red Sweets Part 5
 
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Every index you add to a table increases its storage requirements and DML overheads. So it's a good idea to create as few as possible. When you have two or more indexes using the same columns, you may be able to get away with just one. But how do you decide which to keep? This video discusses how to analyze your queries so you can cut the number of indexes you create. ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 2311 The Magic of SQL
08 09 Demo   Invisible Indexes
 
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ORACLE
Views: 182 oracle ocm
What is Index Scan ,Index Seek and Table Scan?
 
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An index scan or table scan is when SQL Server has to scan the data or index pages to find the appropriate records. index seek happens when data is searched among the index.Please watch full video for detail.
Views: 19873 SqlIsEasy
How to Detect Soft Corruption in Oracle 12c Database
 
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Detection of Soft Corruption in 12c: To use the scripts below replace : , ",# and $ by proper bracket Lets Create a tablespace and small table. SQL: create tablespace DEMO1 datafile '/u02/tstdb1/TSTDB1/datafile/demo01.dbf' size 50M SQL: create table objects tablespace DEMO1 as select * from dba_objects; SQL: alter table objects add constraint pk_obj primary key #object_id$; SQL: create index idx_obj_name on objects#object_name$ tablespace demo1; Backup tablespace. RMAN: backup tablespace DEMO1; We need to put the DB in archivelog first Rebuild index with NOLOGGING option to simulate soft corruption later. RMAN: alter index idx_obj_name rebuild nologging; Confirm that we have datafiles that require backup because they have been affected with NOLOGGING operation. RMAN: report unrecoverable; Simulate corruption. RMAN: alter database datafile 5 offline; RMAN: restore datafile 5; RMAN: recover datafile 5; RMAN: alter database datafile 5 online; Query table with corrupted index and notice error. SQL: select count#*$ from objects where object_name like 'A%'; Let’s perform validation of datafile to check block corruption. RMAN: backup validate check logical datafile 5; Notice that we have 457 blocks marked corrupt but v$database_block_corruption view is empty. SQL: select count#*$ from v$database_block_corruption; Let’s query v$nonlogged_block view. set lines 200 set pages 999 select file#, block#, blocks,object#,reason from v$nonlogged_block; Will RMAN detect that we have corrupted blocks? RMAN: backup datafile 5; RMAN backup won’t fail due to NOLOGGING corrupt blocks and our backup will contain soft corrupted blocks. Let’s Identify corrupt segments using v$nonlogged_block view. set lines 2000 set pages 9999 col owner for a20 col partition_name for a10 col segment_name for a20 SELECT e.owner, e.segment_type, e.segment_name, e.partition_name, c.file# , greatest#e.block_id, c.block#$ corr_start_block# , least#e.block_id+e.blocks-1, c.block#+c.blocks-1$ corr_end_block# , least#e.block_id+e.blocks-1, c.block#+c.blocks-1$ - greatest#e.block_id, c.block#$ + 1 blocks_corrupted FROM dba_extents e, V$NONLOGGED_BLOCK c WHERE e.file_id = c.file# AND e.block_id "= c.block# + c.blocks - 1 AND e.block_id + e.blocks - 1 := c.block# UNION SELECT s.owner, s.segment_type, s.segment_name, s.partition_name, c.file# , header_block corr_start_block# , header_block corr_end_block# , 1 blocks_corrupted FROM dba_segments s, V$NONLOGGED_BLOCK c WHERE s.header_file = c.file# AND s.header_block between c.block# and c.block# + c.blocks - 1 UNION SELECT null owner, null segment_type, null segment_name, null partition_name, c.file# , greatest#f.block_id, c.block#$ corr_start_block# , least#f.block_id+f.blocks-1, c.block#+c.blocks-1$ corr_end_block# , least#f.block_id+f.blocks-1, c.block#+c.blocks-1$ - greatest#f.block_id, c.block#$ + 1 blocks_corrupted FROM dba_free_space f, V$NONLOGGED_BLOCK c WHERE f.file_id = c.file# AND f.block_id "= c.block# + c.blocks - 1 AND f.block_id + f.blocks - 1 := c.block# order by file#, corr_start_block# / This is the best outcome to get if you notice corruption errors. All errors are related to index corruption so we could fix this problem rebuilding index. alter index idx_obj_name rebuild; Simply issuing "alter index rebuild" command won't work. We should mark index unusable to drop segment before rebuilding it or just rebuild index with online option. It is better choice to mark index unusable because you don't need additional space then, but I will simply rebuild index with online option and see what will happen. SQL: alter index idx_obj_name rebuild online; Index altered. SQL: select count#*$ from objects where object_name like 'A%'; No errors... but, let's validate datafile for corruption. RMAN: backup validate check logical datafile 5; Notice "Marked Corrupt" column. Hm... 457 like before. Don't worry, this is not new corruption. These are FREE blocks which will be reused and Oracle will automatically re-format those blocks. Query the v$nonlogged_block view again as given above. We could force re-formatting creating dummy table and inserting data to dummy table. Check Doc ID 336133.1. create table s # n number, c varchar2#4000$ $ nologging tablespace DEMO1; SQL: BEGIN FOR i IN 1..1000000 LOOP INSERT /*+ APPEND */ INTO sys.s select i, lpad#'REFORMAT',3092, 'R'$ from dual; commit ; END LOOP; END; / SQL: drop table sys.s purge; Notice that we don't have corrupted blocks any more. RMAN: backup validate check logical datafile 5;
Views: 178 OracleDBA
Oracle Core,  Лекция 4
 
43:44
Ссылка на файл с презентацией: https://docs.google.com/presentation/d/1hqsC6hEGybAbEEPko56razF7eLBJQEZ3L-ECWtp7rbM/edit?usp=sharing (презентация может быть с анимацией) Ссылка на краткий конспект лекции:https://docs.google.com/document/d/1UFayi0YIXxLrRuj4-JZj-jooyvpoa4rKLOryBloTtag/edit?usp=sharing 1. Create table: permanent tables, temporary tables (on commit delete/preserve rows) 2. Physical properties таблицы: tablespace, logging, pctfree, pctused, initrans 3. Pctfree и pctused 4. Initrans и maxtrans 5.Storage clause: initial, next, minextents, maxextents, pctincrease, freelists, freelist groups, optimal, buffer_pool (keep,recycle), flash_cache (keep, none), encrypt 6. Table properties: column_properties, cache, result_cache, enable_disable_clause, flashback_archive_clause 7. Alter table: column_clause, constraint_clause, alter_table_partitioning, move_table_clause, enable_disable_clause, rename to, shrink space 8. High water mark. Low high water mark 9. Create index: table index clause, index_expr, index_properties, unusable 10. Reverse indexes 11. Function based indexes 12. Alter index: сжатие (shrink space), параллелизм, физические атрибуты (pctfree, pctused, initrans), logging/nologging, rebuild, enable/disable, unusable, visible/invisible, rename to 13. Индекс по внешнему ключу 14. Причины неиспользования индексов 15. Оператор truncate 16. Неявный commit при выполнении ddl 17. Словари данных Oracle Database, БД Oracle, вебинар Oracle, презентация Oracle, урок Oracle, лекция Oracle, обучение Oracle
Clustered vs. Nonclustered Index Structures in SQL Server
 
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Clustered and nonclustered indexes share many of the same internal structures, but they're fundamentally different in nature. Watch Microsoft Certified IT Professional Jon Seigel explain the similarities and differences of clustered and nonclustered indexes, using a real-world example to show how these structures work to improve the performance of SQL queries. Blog post on primary key vs. the clustered index: http://voluntarydba.com/post/2012/10/02/The-Primary-Key-vs-The-Clustered-Index.aspx CREATE INDEX statement reference: http://technet.microsoft.com/en-us/library/ms188783.aspx ALTER INDEX statement reference: http://technet.microsoft.com/en-us/library/ms188388.aspx Index navigation internals by example: http://sqlblog.com/blogs/paul_white/archive/2011/08/09/sql-server-seeks-and-binary-search.aspx Sample index data is from the AdventureWorksLT2008R2 sample database: http://awlt2008dbscript.codeplex.com/releases/view/46169 Visit my channel for more database administration videos: https://www.youtube.com/voluntarydba Subscribe to get notified about my latest videos: https://www.youtube.com/voluntarydba?sub_confirmation=1 Read additional content on my blog: http://voluntarydba.com Follow on Twitter: https://twitter.com/voluntarydba Like on Facebook: https://facebook.com/voluntarydba
Views: 295471 Voluntary DBA
Oracle Tutorial  - List partition step by step Part-2
 
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Hello friends In this video i'm going to demonstrate you how to do table partition in oracle step by step.
Views: 2289 OCP Technology
SQL Performance Table Vs Index Vs View
 
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How the performance of a table Vs Indexed view. Over 300% faster results.
Views: 2078 Tips For IT Pros
09 06 Monitoring Index Usage
 
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ORACLE
Views: 127 oracle ocm
Oracle Database 18c Express Edition Installation on CentOS 7.5 | Oracle Database 18c XE Released
 
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In this video we are going to demonstrate how to install Oracle Database 18c Express Edition in CentOS 7.5. Oracle Database 18c Express Edition installation in CentOS 7 Platform is very easy. This video guides step by step installation of oracle 18c includes kernel parameters configuration, dependencies installation, oracle database installation, oracle listener configuration after installation and finally access oracle enterprise manager 18c in browser. Hardware Requirements : Minimum 2 GB RAM, 2 CPU Cores and Enough Hard disk Space. Software Requirements : CentOS 7 with dependencies for oracle database 18c installed and Kernel Parameters configured. Important Note: To avoid Port already in use error I will be configuring hostname at the end of installation. Installation method : Offline, Oracle Database 18c XE RPM file for linux downloaded and installed. Oracle Database 18c XE Features ############################### Oracle Multitenant SQLJ Microsoft Distributed Transaction Coordinator support Native .NET Data Provider—ODP.NET .NET Stored Procedures Online index rebuild Online table organization Online table redefinition Trial recovery Fast-start fault recovery Flashback Table Flashback Database Cross-platform Backup and Recovery Sharded Queues Network Compression Client Side Query Cache Query Results Cache PL/SQL Function Result Cache Adaptive Execution Plans In-Memory Column Store In-Memory Aggregation Attribute Clustering Column-Level Encryption Tablespace Encryption Oracle Advanced Security Oracle Database Vault Oracle Label Security Centrally Managed Users Fine-grained auditing Privilege Analysis Real Application Security Redaction Transparent Sensitive Data Protection Virtual Private Database Oracle Spatial and Graph Property Graph and RDF Graph Technologies (RDF/OWL) Partitioned spatial indexes Oracle Partitioning Oracle Advanced Analytics Oracle Advanced Compression Advanced Index Compression Prefix Compression (also called Key Compression) Basic Table Compression Deferred Segment Creation Bitmapped index, bitmapped join index, and bitmap plan conversions Transportable tablespaces, including cross-platform and full transportable export and import Summary management—Materialized View Query Rewrite
Views: 1072 java frm
Shrink Space
 
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#Oracle #ShrinkSpace
Views: 1840 Hemant K Chitale
SQL: Types of Indexing
 
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In this tutorial, you'll learn how to make use of different indexes...
Views: 32810 radhikaravikumar
Oracle Database 18c Express Edition Installation on Oracle Linux 6.10 | Oracle Database 18c XE
 
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In this video we are going to demonstrate how to install Oracle Database 18c Express Edition in Oracle Linux 6.10. Oracle Database 18c Express Edition installation in Oracle Linux 6 Platform is very easy. This video guides step by step installation of oracle 18c includes kernel parameters configuration, dependencies installation, oracle database installation, oracle listener configuration after installation and finally access oracle enterprise manager 18c in browser. Hardware Requirements : Minimum 2 GB RAM, 2 CPU Cores and Enough Hard disk Space. Software Requirements : Oracle Enterprise Linux 6 with dependencies for oracle database 18c installed and Kernel Parameters configured. Important Note: To avoid Port already in use error I will be configuring hostname at the end of installation. Installation method : Offline, Oracle Database 18c XE RPM file for linux downloaded and installed. Oracle Database 18c XE Features ############################### Oracle Multitenant - # of PDBs SQLJ Microsoft Distributed Transaction Coordinator support Native .NET Data Provider—ODP.NET .NET Stored Procedures Online index rebuild Online table organization Online table redefinition Trial recovery Fast-start fault recovery Flashback Table Flashback Database Cross-platform Backup and Recovery Sharded Queues Network Compression Client Side Query Cache Query Results Cache PL/SQL Function Result Cache Adaptive Execution Plans In-Memory Column Store In-Memory Aggregation Attribute Clustering Column-Level Encryption Tablespace Encryption Oracle Advanced Security Oracle Database Vault Oracle Label Security Centrally Managed Users Fine-grained auditing Privilege Analysis Real Application Security Redaction Transparent Sensitive Data Protection Virtual Private Database Oracle Spatial and Graph Property Graph and RDF Graph Technologies (RDF/OWL) Partitioned spatial indexes Oracle Partitioning Oracle Advanced Analytics Oracle Advanced Compression Advanced Index Compression Prefix Compression (also called Key Compression) Basic Table Compression Deferred Segment Creation Bitmapped index, bitmapped join index, and bitmap plan conversions Transportable tablespaces, including cross-platform and full transportable export and import Summary management—Materialized View Query Rewrite
Views: 144 java frm
Indexes in sql server   Part 35
 
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In this video we will learn about What are indexes Why do we use indexes Advantages of indexes These concepts are applicable to sql server 2000, 2005 and 2008 Text version of the video http://csharp-video-tutorials.blogspot.com/2012/09/indexes-in-sql-server-part-35.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-35-indexes.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
Views: 387224 kudvenkat