Friday, September 4, 2009

Oracle Database 11g Release 2 New Features : Edition based redefination


Every release has some Major changes , which we usually says New Features.Some of these features dominate the version, For example 11g R1 has SPA , DB Replay Active standby etc. Same this Oracle Release ( Oracle Database 11g Release 2 ) has some New features for which this release will be known in feature. These features are "Edition based redefination"


Most likely these features designed to give big support to APPS upgrade ( ie Oracle E-Business suite upgrade). When you upgrade APPS database , it need lots of down time , hope, using these new features APPS upgrade will take less time in future.


This feature will allow application upgrade( AS DBA , i would prefer to say Online Database object upgrade) with Minimum down time or may be zero down time. I consider this feature as one step toward ZERO DOWN time for application upgrade.


In 10g statistics collected on table published immediatly, That usually cause lots of performance issue. In oracle 11g r1 there is feature, for collecting stats on tables and publishing stats , as per need to avoid performance issue due to stats collection.

Taking similar feature to next step , 11g R2 has feature "REDEFINITION" , which upgrades objects , but not published immediately, also database can have multiple Editions of objects definition. Of-course there are, some limitation



Check Default Edition

SQL>
1 SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES
2* Where PROPERTY_NAME = 'DEFAULT_EDITION'
SQL> /

PROPERTY_VALUE
--------------------------------------------------------------------------------
ORA$BASE



Changing Edition at session or Database level

SQL> ALTER SESSION SET EDITION=ora$base;

Session altered.

SQL> ALTER DATABASE DEFAULT EDITION =ora$base;

Database altered.





Grant create or drop edition to user

SQL> GRANT CREATE ANY EDITION, DROP ANY EDITION to virag;

Grant succeeded.


Enable Edition on schema / User

SQL> ALTER USER virag ENABLE EDITIONS force;


Of-course there are, some limitation......

Will add more ......soon , for How to...


Reference

19 Edition-Based Redefinition

More Post on Oracle RDBMS Database 11g R2 ( Release 2 ) 

Oracle 11g Release 2 (11.2 ) New Features : SCAN - Single Client Access Name
11G R2 New Feature : Purge audit trail records using DBMS_AUDIT_MGMT
Oracle Database 11g Release 2 New Features : Edition based redefination

3 comments:

  1. I recently came accross your blog and have been reading along. I thought I would leave my first comment. I dont know what to say except that I have enjoyed reading. Nice blog. I will keep visiting this blog very often.


    Patricia

    http://dataentryjob-s.com

    ReplyDelete
  2. Yes its true that every version comes up with lots of exciting new features that not only dominates the earlier version but also interesting to explore too. I do have recently started working on 11g and have yet to explore many of its new feature.
    oracle ebs

    ReplyDelete
  3. I completely agree with you that this version comes up with lots of new features. I am trying these new features. I have lot to explore. 11g is one of the best versions I worked on. The work can be done very easily. I really like your post.
    oracle ebs r12

    ReplyDelete

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