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What is? - Advanced Compression in Oracle Database 12c
 
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Join Kevin Jernigan, as he talks about Advanced Compression in Oracle Database 12c. How it optimizes and makes I/O reads more efficient and increases throughput. ================================= For more information, see http://www.oracle.com/goto/oll 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.
Table Compression Enhancement in Oracle Database 11g R2
 
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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: 2265 Saurabh Joshi
Compression Options for Oracle Database
 
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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: 216 Oracle Developers
Oracle Database 12c OLTP Compression
 
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This short video uses swingbench to demonstrate that its possible to make excellent space savings of both the space needed to store rows and the associated indexes without compromising transaction performance. You can find out more information on Oracle Database compression in this white paper http://www.oracle.com/technetwork/database/options/compression/advanced-compression-wp-12c-1896128.pdf You can download the software used in this demonstration here http://www.dominicgiles.com/swingbench.html
Views: 540 Dominic Giles
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: 6481 BhagyaRaj Katta
Index Compression in Oracle Database 12c Release 1 (12.1.0.2)
 
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A quick intro to the new Advanced Index Compression in Oracle Database 12c release 1 (12.1.0.2). This functionality is part of the Advanced Compression Option
Views: 2148 Dominic Giles
Page and Row Compression Deep Dive (DBA)
 
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Bradley Ball, Pragmatic Works
Views: 636 PASStv
Data Compression in SQL Server - Pros and Cons
 
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Refer to http://www.sqlvideo.com/AllVideos/Data-Compression-in-SQL-Server---Pros-and-Cons for additional details. This SQL Server Video includes demos. You have the possibility to practice the hands-on examples while watching the video. SQLTest Tool (http://www.sqltest.org) simulates the hands-on labs for you, no registration necessary. For in-person workshops check out our schedule: http://www.sqlworkshops.com/schedule or contact us for a customized, onsite workshop http://www.sqlworkshops.com/contact To read some feedback from previous workshop participants, go to http://www.sqlworkshops.com/feedback
Views: 2733 SQLWorkshops
Oracle Database 12c: Better PL/SQL From SQL
 
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Overview and demonstration of using the plsql_declarations clause to embed a PL/SQL function in a SQL SELECT statement. "plsql_declarations" in Oracle® Database SQL Language Reference http://www.oracle.com/pls/topic/lookup?ctx=db121&id=BABJCBCC
Views: 2579 OracleDBVision
SQL Plan Baselines
 
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SQL Plan Baselines watch more videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjab, Tutorials Point India Private Limited
SQL Server Tutorial 20:  Table, Index and Row Compression
 
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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: 2861 Johnny Deluca
Methods for Compressing a SQL Database
 
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In this video, Don Jones will explore some of the options for compression in SQL Server 2008.
Views: 647 SMBitSimplified
Database Oracle Compress
 
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Ini merupakan cara kompresing database oracle, video ini dibuat oleh Rony Ihsan, salah satu senior Technical Advisor Database.
SQL Server Data Compression
 
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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: 2006 SentryOne
Oracle SQL Programming - Searching and Sorting (SELECT)
 
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A practical demonstration of searching and sorting records using Oracle. Includes the use of various WHERE clause operators that can be used with the SELECT keyword, and the use of the ORDER BY clause.
Views: 104 Brian Green
SQL Server Tutorial 21: Understanding Page Compression
 
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How to compress a page using SSMS, or T-SQL. For more info, or a copy of the scripts used in this tutorial, please email me at [email protected]
Views: 1580 Johnny Deluca
Oracle Enterprise Manager: Intelligent Incident Compression
 
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Beginning with Enterprise Manager 13c, Intelligent Incident Compression allows multiple events to be automatically grouped into a single incident. This recording consists of a product overview (8 min), followed by a demo (5 min). See Enterprise manager online documentation for more information: http://docs.oracle.com/cd/E73210_01/EMADM/GUID-D0428ED9-FCA8-44D6-AB5B-B8FF4139BF0D.htm#EMADM15277 ================================= To improve the video quality, click the gear icon and set the Quality to 1080p/720p HD. For more information, see http://www.oracle.com/goto/oll and http://docs.oracle.com Copyright © 2017 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.
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/
WDM 52:  Why do we compress indexes
 
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Why do we compress indexes 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: 3919 Oresoft LWC
SQL Server Backup Compression
 
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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: 6463 DBATAG
Heap Tables and Index Organized Tables in Oracle | Chris Saxon
 
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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.
Understanding Data Compression in SQL Server Sample Lecture
 
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https://www.udemy.com/understanding-data-compression-in-sql-server Use coupon code YOU50TUBE at the above link for a 50% discount! This is a sample lecture from my online training course "Understanding Data Compression in SQL Server."
Views: 1634 Shaun Stuart
How to Compress an ArcSDE Oracle geodatabase ESRI ?
 
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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: 955 nitesh jauhari
Oracle Data Export and Import using DataPump expdp and impdp
 
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Oracle Data Export and Import using DataPump expdp and impdp
Views: 173629 Abbasi Asif
Oracle Advance Compression
 
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Oracle Advance Compression
Views: 433 BD2 Proyecto
How to Convert a Non-Partitioned Table to Partitioned using Oracle Database 12c R2
 
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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: 2851 SkillBuilders
JSON In the Oracle Database 12c Release 1 (12.1.0.2)
 
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A really quick look at the ability to store JSON in the Oracle Database 12c Release 1 (12.1.0.2) 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: 7939 Dominic Giles
Download and Install SQL Developer for Oracle 11g
 
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Download and Install Oracle Database first https://www.youtube.com/watch?v=EMp3hWORSXc Download SQL Developer directly here https://goo.gl/syxqgy Download link from Oracle Site http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html
Views: 3265 jinu jawad m
Oracle Exadata Hybrid Columnar Compression
 
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Flipchart video explaining new hybrid columnar compression technology available with Oracle Exadata.
Views: 13189 Oracle Video
compressing a materialized view
 
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you can compress materialized view in a fashion similar to the one used to compress tables
Views: 1255 Brodo
Setting up Data Compression on SQL Server 2008
 
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Detailed Article for "SQL Server 2008 Data Compression" is available at : http://sqlserver-training.com/data-compression-table-level-compression-video-tutorials/ Follow us for more Updates at : http://sqlserver-training.com/
Views: 1392 DBATAG
Oracle ACE Director Discusses Cost Savings with Oracle Database 11g
 
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Dan Morgan, Oracle ACE Director, discusses benefits of Advanced Compression, Partitioning, and other gems in Oracle Database 11g. John Brust of Oracle hosts.
Views: 4731 Oracle Video
MariaDB TX 3.0, the OSS Alternative to Closed Databases like Oracle, MSSQL & DB2
 
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MariaDB TX 3.0, the OSS Alternative to Closed Databases like Oracle, MSSQL & DB2 by Rasmus Johansson, VP of Engineering, MariaDB • Funny pre-event tech-trivia: https://youtu.be/rgBpE9dwBjs We have a reason to celebrate! You finally have an open-source alternative to proprietary databases like Oracle, IBM DB2 and MS SQL Server! In the past, features like temporal tables and queries, purpose-built storage engines, data masking and obfuscation with instant, invisible or compressed columns required the use of a proprietary database, but now MariaDB TX 3.0 delivers these in an enterprise open source database. This presentation introduces the latest features available in MariaDB TX 3.0, why they were developed, how you can use them and what they mean for your business. You will learn about: • Oracle compatibility, including sequences and stored procedures • Temporal tables and queries, as well as deployment strategies • The use of different storage engines for different tables • Protecting personal data with masking and obfuscation • Adding columns without ever needing to rebuild tables As part of our celebration, we will be pouring Salmiakki Koskenkorva, a licorice-flavored black vodka that is a favorite of Finland! ••• Rasmus Johansson, VP of Engineering, MariaDB ••• Rasmus manages MariaDB Server development. He joined Monty Program Ab in 2010 where he served as the COO of the company. Monty Program became MariaDB Corporation after merging with SkySQL in 2013. Previously, Rasmus worked for Microsoft where he focused on SQL Server and before that he worked for CGI and Icon Medialab. He started his career as a developer and still enjoys being part of engineering. He is based in Helsinki, Finland.
Very Large Databases Lessons Learned
 
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Whoever coined the term "one size fits all" was not a DBA. Very large databases (VLDBs) have different needs from their smaller counterparts, and the techniques for effectively managing them need to grow along with their contents. In this session, join Microsoft Certified Master Bob Pusateri as he shares lessons learned over years of maintaining databases over 20TB in size. This talk will include techniques for speeding up maintenance operations before they start running unacceptably long, methods for minimizing user impact while critical processes run, the awesome world of data compression, and new features in SQL Server 2014 and 2016 that can really make your life easier. You'll also see how generally-accepted best practices aren't always the best idea for VLDB environments, and how, when, and why deviating from them can be appropriate. Just because databases are huge doesn't mean they aren't manageable, attend this session and see for yourself!
Views: 2621 DBAFundamentals
Feeling the Storage Squeeze?
 
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Oracle Advanced Compression
Views: 7287 Oracle Video
Managing Oracle Database In-Memory
 
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In this second of three presentations, Maria Colgan explains how to control which objects get populated into the column store and how to monitor the performance of queries against the column store.
Oracle SQL Developer Tutorial For Beginners  65   OLTP   Online Transaction Processing System
 
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Oracle SQL Developer Tutorial For Beginners Series. This course introduces Oracle SQL Development for its subscribers. Currently this is based on Oracle 12c. The test environment is in Windows 10.
Views: 736 Sam Dhanasekaran
Scriptcase 8 - Enabling and Connecting DBs (Oracle, DB2, MS SQL Server, Informix)
 
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This video was recorded from a live webinar that happened on June, 12th. During the webinar we explain how to enable and connect the Scriptcase with DBs: Oracle, DB2, MS SQL Server, Informix. Each of these systems have quirks in their connections. We show all the details and tips. Timing acording to the DB: - IBM DB2: 02'10'' - Informix: 09'35'' - Oracle: 27'05'' and 36'05'' - SQL Server: 32'00''
Oracle Database 12c Security - Oracle Virtual Private Database (VPD)
 
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Learn how to use Oracle Virtual Private Database (VPD) to secure your data. See all lessons at http://skillbuilders.com/12c-TSDP-Tutorial First, Virtual Private Database. What is it? Answer: It's a declarative technique for enforcing security. Typically, it's based on user application context. That was the first limitation of 8i. Backed with 8i context were session-specific. The context variables were sort in the PGA. That means you simply couldn't use this in a web environment. However, global context, with use of 9i, Virtual Private Database became usable for web applications with connection pooling. But whether you're using it to client server or on a three tier environment, it's declarative technique rather than a programmatic technique. I can go behind the back of the application as a DBA and generate predicates to get appended to all SQLs. Select, insert, update, delete the end users. Issue the SQL and I will generate a predicate that filters the access. It's impossible to bypass. All users will have predicates appended to all their code. It doesn't matter whether they're using SQL Plus, Discoverer, Business Objects, Crystal Reports, eBusiness Suites, whatever they're using, I as DBA can filter their access to roles. The end result, different users see different data sets while running the same code and accessing the same tables, hence, the name Virtual Private Database. Different users will think they're seeing a totally different set of tables, but in fact it's one column database, one set of tables hosting a single application shared by all the users. The mechanism - you can apply VPD to tables, to views, to synonyms, and a declarative technique. Once the technique you write a function that generates the predicate, you associate the function with the table. From then on whenever the user issue SQL against that table the Cost-Based Optimizer rewrites the code. The Cost-Based Optimizer rewrites the user SQL to call the function to generate the predicate. The predicate is then appended to the SQL and it's the modified SQL that is parsed and executed. Let's see how this actually works. I'm working here by the way. This is just a perfectly normal 12.1 database. But what I'm going to demonstrate at this point will in fact work on 11g as well. I'm not going to be using any of the 12c enhancements to VPD for this little demonstration. I'll work in the scott schema. What do we have to do? We write a function to generate the predicate string. Create function. And I'll my function vpdf. The function must conform to a fixed specification. It must take two varchar arguments. One of the arguments is intended to be the schema to which the function will be applied. The other argument is the object within the schema to which the function will be applied. And it must return a varchar2, which is the generated predicate. Let's begin. Within this function you can do just about anything. There are some limitations. It's impossible for the function to query or update the table against which the VPD calls here is going to be applied or we violate the rules of purity that we come across so often with PL/SQL. But apart from that, it can do just about anything - including a number of dreadful side effects can be introduced by writing VPD functions. I'm going to do a very simple one on this one. I'll shall simple return immediately a predicate. What predicate? Ename, which is the ename column from this scott.emp table. Ename should equal sys_context. I'll go to the local context, my user end context, and just extract session user. We can see that John has tested this earlier today and therefore the object already was suggesting and he's just dropping it now and cleaning up the recreate. I hope you realize these really are live demonstrations. I'm not just running scripts. I've created a function. What's that function going to do? It's going to return this value here. Test it. Always test it and see what it's actually going to do. I'll select vpdf. I have to give it a couple of arguments. This one will do for now.
Views: 4360 SkillBuilders
Oracle Database Indexes: Myths, Tips and Tricks
 
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In this tutorial, OCM John Watson will - via demonstrations - debunk these myths: Myth #1: Oracle Database does not index NULL Myth #2: A search that includes wildcards can't use an index if the wildcard precedes the string. Myth #3: Oracle will not use a function-based index unless the FBI is coded in the predicate. Myth #4: Indexes always help. The more indexes the better. See http://skillbuilders.com/free-oracle-tutorials for gigabytes of free Oracle video tutorials.
Views: 16073 SkillBuilders
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: 798 Oracle PL/SQL World
Exploring Oracle 12c's Automatic Database Optimization (ADO) Features:
 
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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: 5323 Database Community
Oracle SQL Developer Tutorial For Beginners   31   DBA Info   Default Permanent Tablespace
 
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Oracle SQL Developer Tutorial For Beginners Series. This course introduces Oracle SQL Development for its subscribers. Currently this is based on Oracle 12c. The test environment is in Windows 10.
Views: 1554 Sam Dhanasekaran
B*Tree Index Types (Indexes in Oracle-2)
 
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This video will cover different types of B-tree indexes: Descending index,Reverse key index,Key Compressed Index B-tree cluster index,Index Organized Table(IOT):
Views: 15278 Anindya Das
Understanding Data Compression in SQL Server Introduction Video
 
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https://www.udemy.com/understanding-data-compression-in-sql-server Use coupon code YOU50TUBE at the above link for a 50% discount! The introduction video to my online video course Understanding Data Compression in SQL Server.
Views: 132 Shaun Stuart
RMAN FULL BACKUP & COMPRESSED BACKUP
 
09:01
In this video i'm going show you how to take backup through RMAN.
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Checkpoints in Oracle GoldenGate - GG Video 9
 
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In this video, you will learn how Checkpoints are used in Oracle GoldenGate. It helps you to understand the purpose of Checkpoints including, Transaction Integrity, Ordering transaction and recovery of processes after a stop or crash. 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]
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