A quick intro to the new Advanced Index Compression in Oracle Database 12c release 1 (220.127.116.11). This functionality is part of the Advanced Compression Option
Views: 2284 Dominic Giles
Held on August 9 2018 This session by Gregg Christman focuses on general questions and insights regarding Oracle Basic Compression, Oracle OLTP Table Compression and Oracle Advanced Row Compression. Here is a quick guide to the highlights: 2:25 Basic vs. Advanced Row Compression comparison 4:55 Should you expect the same compression ratio with Basic and Advanced Row Compression? 8:29 Should you compress all tables and partitions? 15:50 What is the overhead associated with Advanced Row Compression? 17:06 Do I need to change my application to use compression? 17:31 Who uses Advanced Row Compression? 18:35 Is there any ongoing administration with Advanced Row Compression 20:43 When does updated data get compressed? 26:30 What role does PCTFREE play in updates and compression? 28:44 Does Advanced Row Compression work with Oracle Encryption? 29:34 Does enabling compression online or offline make a difference? 31:38 What are the typical compression ratios with Basic and Advanced Row Compression? 32:56 Are there any suggested MOS notes related to compression? 34:12 Feedback about ACO from customers 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: 499 Oracle Developers
Table Compression: Overview Oracle Database supports three methods of table compression: 1.Basic table compression 2.OLTP table compression Oracle Corporation recommends to compress all data to reduce storage costs. The Oracle database can use table compression to eliminate duplicate values in a data block. For tables with highly redundant data, compression saves disk space and reduces memory use in the database buffer cache. Table compression is transparent to database applications. The table_compression clause is valid only for heap-organized tables. The COMPRESS keyword enables table compression. The NOCOMPRESS keyword disables table compression. NOCOMPRESS is the default. With basic compression, the Oracle database compresses data at the time of performing bulk load using operations such as direct loads or CREATE TABLE AS SELECT. With COMPRESS FOR OLTP, the Oracle database compresses data during all DML operations on the table.
Views: 2421 Saurabh Joshi
SQL 12c Tutorial 20 : SQL 12c Creating Multiple Indexes on column SQL 12c New Features SQL 12c Tutorial for beginners Oracle 12c Tutorial for beginners Creating Multiple indexes on column
Views: 925 TechLake
exchange Partition , Move partition in oracle Possible operations with partitions SQL Tutorial SQL Tutorial for beginners PLSQL Tutorial PLSQL Tutorial for beginners PL/SQL Tutorial PL SQL Tutorial PL SQL Tutorial for beginners PL/SQL Tutorial for beginners Oracle SQL Tutorial Add Drop Rename Split Move ( Moving from Tablespace to tablespace) Exchange (Table to Table(non Partitioned table)) not partitioned only exchanging data (p)
Views: 1483 TechLake
This Video series will explain partitioning and its use cases referencing real project examples from different domain. It will explain what when and why of partitioning in a simple but elaborate manner. This is the 1st video which explains why partitioning is required and what are the advantages we gain from it. The following videos will explain when should we do it and how.
Views: 26940 Tech Coach
How to Compress an ArcSDE geodatabase? lets learn on how to compress an arcsde geodatabase launch arc catalog now point to note is that only an geodatabase administrator can compress the geodatabase so here we will use sde user to compress the gdb as of now we donot have any data in this db but still i can show you how to compress so we can either compress from here and it will be running in the background or we can run the compress tool. . COOL our database is compressed now now you notice that compress log is generated this compress log is generated in the beginning of the compress operation or when the compress operation is done first time on a database every time you compress the database, an entry of compress will be added in this compress log i will show you if the end_state_count is 1, that means the database is compressed to state 0. so it how we can compress its done For more information, write to us at www.arcsdesupport.com or visit arcsde.blogspot.in
Views: 1047 nitesh jauhari
Oracle Database 12c Release 2 New Feature! Learn how to convert a non-partitioned table to a partitioned table - Online! This new method - using ALTER TABLE MODIFY - is much simpler than DBMS_REDEFINITION. In this free tutorial from SkillBuilders and Oracle Certified Master DBA John Watson you'll see a demonstration of converting the table and the impact on the underlying table and indexes. See all our free Oracle Database Tutorials at http://www.skillbuilders.com/free-oracle-tutorials.
Views: 3435 SkillBuilders
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: 7090 BhagyaRaj Katta
How to use table, index and row compresson with SSMS or T-SQL. For more info, or a copy of the scripts used in this tutorial, please email me at [email protected]
Views: 3070 Johnny Deluca
A really quick look at the ability to store JSON in the Oracle Database 12c Release 1 (18.104.22.168) and accessing it using Python and the Oracle_CX open source driver. You can find the Oracle documentation on it here http://docs.oracle.com/database/121/ADXDB/json.htm#ADXDB6246
Views: 8592 Dominic Giles
Oracle SQL Index types with examples. Simple Index, Composite Index, Unique Index, Non Unique Index, Bitmap Index, B-tree Index. SQL Tutorial SQL Tutorial for beginners Oracle SQL Tutorial for beginners
Views: 20806 TechLake
Chris Saxon, a database evangelist, developer advocate, and SQL specialist with Oracle, uses up his two minutes with a tip on using heap tables and index organized tables in Oracle Database.
Views: 2807 ArchBeat Archive
Sometimes a poor clustering factor is the cause when Oracle Database cost based optimizer does not choose to use an index. With Oracle 12c (22.214.171.124 EE) offers a new feature that can really help - "Atrribute Clustering". This is implemented with a new keyword on CREATE TABLE - "CLUSTERING BY LINEAR ORDER". In this Free Tutorial from SkillBuilders and Oracle Certified Master DBA John Watson, you'll get a brief refresher on clustering factor and a demonstration of CREATE TABLE - "CLUSTERING BY LINEAR ORDER" - so the CBO will use your index! In this first lesson, John will provide a brief review of clustering factor. See all 6 lessons - FREE - at http://www.skillbuilders.com/12c-attribute-clustering
Views: 385 SkillBuilders
Oracle Data Export and Import using DataPump expdp and impdp
Views: 183551 Abbasi Asif
This video gives an overview of indexing JSON data in Oracle database 12c. For more information see: https://oracle-base.com/articles/12c/indexing-json-data-in-oracle-database-12cr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Bertrand Drouvot : Blog: https://bdrouvot.wordpress.com/ Twitter : https://twitter.com/BertrandDrouvot Cameo appearances are for fun, not an endorsement of the content of this video. All trademarks, product names and logos are the property of their respective owners.
Views: 1816 ORACLE-BASE.com
The demonstration illustrates how inmemory compression of inmemory objects populated in the IM column store can influence either query performance or storage savings in IM column store.
Views: 2782 Oracle Learning Library
This lesson demonstrates cases where a *B-Tree* index cannot be used AND shows how Oracle will use a *bitmap* index. See all lessons, free, at http://www.skillbuilders.com/when-to-use-oracle-bitmap-indexes.
Views: 771 SkillBuilders
Tom Kyte introduces the new partitioning improvements in Oracle Database 12c, followed by a demo of global index maintenance. For more information: "Asynchronous Global Index Maintenance for Dropping and Truncating Partitions" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=VLDBG14107 "Changes for Very Large Databases and Partitioning in Oracle Database 12c Release 1" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=VLDBG14100 "ALTER INDEX COALESCE Clause" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=SQLRF52782 "DBMS_PART.CLEANUP_GIDX Procedure" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=ARPLS74409
Views: 13664 OracleDBVision
After long time, Oracle has released finally Oracle Database 18c Express Edition for Windows x64, Oracle Database Express Edition (XE) Release 126.96.36.199.0 In this video we are going to demonstrate how to install Oracle Database 18c Express Edition on Windows 10 Oracle Database 18c Express Edition installation in Windows is very easy. This video guides step by step installation. We are going to learn 1. Database Installation 2. Enterprise Manager Overview 3. SQL Plus tool 4. Oracle Instance Manager to start and shutdown database instance. Hardware Requirements : Minimum 2 GB RAM, 2 CPU Cores and Enough Hard disk Space. Software Requirements : OracleXE184_Win64 Zip file for Windows already downloaded from Oracle website. Important Note: Adobe Flash player must be installed in order to browse Enterpise Manager Console on Internet Explorer. Installation method : Offline, Oracle Database 18c Zip file for Windows downloaded and installed. download link: https://www.oracle.com/technetwork/database/database-technologies/express-edition/downloads/index-083047.html 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: 1648 java frm
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: 2535 SkillBuilders
Oracle Database Release 12cR1's new Automatic Database Optimization (ADO) features now make it possible to automatically locate data within the most appropriate storage tier and at the appropriate compression level based on its usage patterns. Join Oracle Ace Director Jim Czuprynski as he discusses how to take advantage of these features to save crucial Tier 0 and Tier 1 storage space ... and perhaps even improve query and DML performance.
Views: 5522 Database Community
This video shows you how to access ADO in an Oracle Database 12c managed target, how to use the heatmap to gain a graphical overview over data access, including drilling down to tablespace and segment level, and how to add a Automatic Data Optimization policy to a table. Note that the Cloud Control 12c features depicted here are only applicable to Oracle Database 12c managed targets. Copyright © 2013 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement. Note that the Cloud Control 12c features depicted here are only applicable to Oracle Database 12c managed targets.
Views: 2380 Oracle Learning Library
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: 2705 DWS Ltd
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: 1492 java frm
https://dbagenesis.com/p/oracle-11g-advanced-dba DBA Genesis provides all you need to build and manage effective Oracle technology learning. We designed DBA Genesis as a simple to use yet powerful online Oracle learning system for students. Each of our courses is taught by an expert instructor, and every course is available on demand. Video talks about "what are table clusters inside Oracle database". One of video lessons from our Advanced DBA video course. Have a happy learning!
Views: 4024 DBA Genesis
The information in full-text indexes is used by the Full-Text Engine to compile full-text queries that can quickly search a table for particular words or combinations of words. A full-text index stores information about significant words and their location within one or more columns of a database table. A full-text index is a special type of token-based functional index that is built and maintained by the Full-Text Engine for SQL Server. The process of building a full-text index differs from building other types of indexes. Instead of constructing a B-tree structure based on a value stored in a particular row, the Full-Text Engine builds an inverted, stacked, compressed index structure based on individual tokens from the text being indexed. ------------- May be you like this -------------- Our channel: https://www.youtube.com/c/gofreelancertutorials Interest to donate : https://www.paypal.me/gofreelancer RavenDB playlist here: https://www.youtube.com/watch?v=Q8M4eIgzMHo&list=PLv0T7WlllnSnxvVNZR7CHVR0hR-8t69ow KnockoutJs Playlist: https://www.youtube.com/watch?v=H3IWQg1TfdA&list=PLv0T7WlllnSk2iDeqcwRyty__TRJMgGhr Wcf playlist : https://www.youtube.com/watch?v=t-6wGwiaDj4&list=PLv0T7WlllnSnulXRU200Lx97e_pJrGGfo Wcf restful playlist : https://www.youtube.com/watch?v=NB4k0RC6vl0&list=PLv0T7WlllnSmcGHacEQnLgKvitcJEsSl6 Angularjs playlist : https://www.youtube.com/watch?v=KXjD1RiAz1U&list=PLv0T7WlllnSkCfNftTNY8tWqCFWT0sIMd c# playlist: https://www.youtube.com/watch?v=ZrP0NKbsr8s&list=PLv0T7WlllnSl9pZWMaMGsyoAmqZtW4gM0 google maps playlist: https://www.youtube.com/watch?v=_3lci2cE05M&list=PLv0T7WlllnSnXz4EiDxNA5OWnfr5xgig umbraco playlist : https://www.youtube.com/watch?v=zoefdruzmGE&list=PLv0T7WlllnSnYRedhwL8x-atkVxrSdd3m jquery playlist : https://www.youtube.com/watch?v=jVncasz_iyw&list=PLv0T7WlllnSkkNahiiWu_GMXq49X5ccfe
Views: 176 Go Freelancer
Adding Indexes to a Table in Management Studio using Microsoft SQL Server
Views: 1675 Barry Solomon
Have you heard of the data compression feature in Enterprise Editions of SQL Server 2008 and later? It promises great savings on storage space. But did you know it can also improve I/O performance and enhance SQL Server memory? It also has costs too, in particular, it costs additional CPU to compress data on the fly. But how much CPU is spent on data compression overhead? Is it too much to be worth your time? Or is it an acceptable cost for the big gains in storage space, I/O performance, and memory improvements? To find out all about this cool technology, join Kevin Kline (@kekline) and Melissa Connors (@melikanokaoi) for this case study webinar. They’ll show how data compression works, how to choose the tables and indexes to compress, and the positive and negative performance impact of implementing data compression. Attend this webinar to learn the important ways that data compression affects workloads.
Views: 2335 SentryOne
What is a dictionary? What do we gain by using one? How does this relate to CREATE DOMAIN? How would dictionaries affect query processing? Is a dictionary something a user has to be aware of? How does dictionary compression relate to domain encoding? What are the pros and cons of dictionary compression? Video for my inverted classroom "Database Systems". (V2: bugfix in first SQL statement} The complete list of videos, slides, and additional material is (will be) available at http://datenbankenlernen.de Computer Science, Saarland University: Bachelor (in German): http://www.cs.uni-saarland.de/index.php?id=52&L=1 Master (in English): http://www.cs.uni-saarland.de/index.php?id=132&L=1 Ph.D./Grad School: http://gradschool.cs.uni-saarland.de/
Views: 3527 Prof. Dr. Jens Dittrich
Introduction to Index Construction For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=1 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: 6044 Oresoft LWC
What is REVERSE INDEX? What does REVERSE INDEX mean? REVERSE INDEX meaning - REVERSE INDEX definition - REVERSE INDEX explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ Database management systems provide multiple types of indexes to improve performance and data integrity across diverse applications. Index types include b-trees, bitmaps, and r-trees. In database management systems, a reverse key index strategy reverses the key value before entering it in the index. E.g., the value 24538 becomes 83542 in the index. Reversing the key value is particularly useful for indexing data such as sequence numbers, where each new key value is greater than the prior value, i.e., values monotonically increase. Reverse key indexes have become particularly important in high volume transaction processing systems because they reduce contention for index blocks. Reversed key indexes use b-tree structures, but preprocess key values before inserting them. Simplifying, b-trees place similar values on a single index block, e.g., storing 24538 on the same block as 24539. This makes them efficient both for looking up a specific value and for finding values within a range. However if the application inserts values in sequence, each insert must have access to the newest block in the index in order to add the new value. If many users attempt to insert at the same time, they all must write to that block and have to get in line, slowing down the application. This is particularly a problem in clustered databases, which may require the block to be copied from one computer's memory to another's to allow the next user to perform their insert. Reversing the key spreads similar new values across the entire index instead of concentrating them in any one leaf block. This means that 24538 appears on the same block as 14538 while 24539 goes to a different block, eliminating this cause of contention. (Since 14538 would have been created long before 24538, their inserts don't interfere with each other.) Reverse indexes are just as efficient as unreversed indexes for finding specific values, although they aren't helpful for range queries. Range queries are uncommon for artificial values such as sequence numbers. When searching the index, the query processor simply reverses the search target before looking it up. Typically, applications delete data that is older on average before deleting newer data. Thus, data with lower sequence numbers generally go before those with higher values. As time passes, in standard b-trees, index blocks for lower values end up containing few values, with a commensurate increase in unused space, referred to as "rot". Rot not only wastes space, but slows query speeds, because a smaller fraction of a rotten index's blocks fit in memory at any one time. In a b-tree, if 14538 gets deleted, its index space remains empty. In a reverse index, if 14538 goes before 24538 arrives, 24538 can reuse 14538's space.
Views: 863 The Audiopedia
Views: 59 oracle ocm
Explore SQL with Tom Coffing of Coffing Data Warehousing! In this lesson, learn how to create many different types of Partition Primary Index (PPI) Tables!
Views: 490 Coffing Data Warehousing
The demonstration provides an overview of the architecture of the In-Memory Column Store feature introduced in Oracle Database 12c Release 1 patchset 1.
Views: 22374 Oracle Learning Library
Detailed Article for "SQL Server Backup Compression" is available at : http://sqlserver-training.com/backup-compression-sql-server-2008 Follow us at more Updates at ----------------------------------------- Website : http://sqlserver-training.com/ Twitter : http://twitter.com/dbatag/ Facebook : http://facebook.com/dbatag/ Linked In : http://in.linkedin.com/in/dbatag/ ================================ Backup compression was introduced in SQL Server 2008 Enterprise, which reduces the size of backups and the time that it takes to create them. Using backup compression is a simple process. Transact-SQL—WITH COMPRESSION in the BACKUP statement, BACKUP DATABASE AdventureWorks2008 TO DISK = 'C:\AWBackupCompressed.bak' WITH COMPRESSION By default, no backups are compressed. You can change this default setting by using sp_configure to set the value of the backup_compression_default setting as shown in the following code example. Alternatively, you can change the default setting by selecting the option in the Server Properties dialog box. USE master Go EXEC sys.sp_configure N'backup compression default', N'1' GO RECONFIGURE WITH OVERRIDE GO Although compressed backups require less disk space to store them and less time to create, there is a tradeoff. The compression is a CPU-intensive operation that can impact other operations that occur on your servers. To avoid such contention, you can use Resource Governor to limit the CPU usage for a backup operation. Note: Compression and transparent data encryption are mutually exclusive. Creating a backup with compression is supported only in SQL Server 2008 Enterprise Edition; all SQL Server 2008 editions can restore a compressed backup. Visit the following link for more details and SQL Server Tutorials http://sqlserver-training.com/ http://sqlserver-training.com/how-many-dmv-are-available-in-sql-server-2008 http://sqlserver-training.com/how-to-move-tempdb-files-to-a-new-drive-video http://sqlserver-training.com/featured-articles http://sqlserver-training.com/complete-list-of-sql-server-versions-builds http://sqlserver-training.com/cumulative-update-package-3-for-sql-server-2008-r2-is-released-now http://sqlserver-training.com/video-tutorials http://sqlserver-training.com/how-to-optimizing-tempdb http://sqlserver-training.com/dbcc-check-db-uses-parallelism-how-it-works http://sqlserver-training.com/sql-server-2008-upgrade-tools-and-approaches http://sqlserver-training.com/migrating-sql-server-2000-to-sql-server-2008 http://sqlserver-training.com/new-features-of-sql-server-2008-2 http://sqlserver-training.com/extensible-key-management-ekm-sql-server-2008 http://sqlserver-training.com/database-mirroring-enhancements-in-sql-server-2008-from-2005/ http://sqlserver-training.com/data-compression-table-level-compression-video-tutorials/ http://sqlserver-training.com/sql-server-2008-hot-add-cpu/ http://sqlserver-training.com/sql-server-migration-assistant-for-mysql/ http://sqlserver-training.com/microsoft-sql-server-migration-assistant-for-sybase/ http://sqlserver-training.com/sql-server-migration-assistant-for-oracle/ http://sqlserver-training.com/sql-server-migration-assistant-for-access/ http://sqlserver-training.com/database-size-growth-chart-report-graphically/ http://sqlserver-training.com/introduction-to-microsoft-sql-server-2008-r2/ http://sqlserver-training.com/sql-server-2008-workshop-in-chennai-august-02-to-august-05-2010/ http://sqlserver-training.com/new-features-of-sql-server-2008/ http://sqlserver-training.com/sql-server-2008-star-join-query-optimization/ http://sqlserver-training.com/sql-server-monitoring-management-pack-6-1-314-36/ http://sqlserver-training.com/sql-azure-database-video-tutorial/ http://sqlserver-training.com/can-we-call-dll-from-sql-server/ http://sqlserver-training.com/master-data-services-mds-sql-server-2008-video-tutorial/
Views: 6703 DBATAG