I recently upgraded to 11.2.0.2 from 11.1.0.7. Immediately after the upgrade, I noticed a spike in our redo generation. I also noticed tables with names like DBMS_TABCOMP_TEMP_UNCMP and DBMS_TABCOMP_TEMP_CMP. What are those tables doing in my production schemas and how did they get there? After digging, I was able to find out that these are …
October 2011 archive
Oct 06
LOB RETENTION
In the past, one would use the PCTVERSION storage parameter for their LOB segments to reserve a percentage of storage space for read consistency of LOB segments. In Oracle 11g, you can now use the RETENTION parameter. The RETENTION parameter will use the UNDO_RETENTION parameter for determining how long to keep LOB data for read-consistency …
Oct 05
Upgrading Grid Control After Manual DB Upgrade
I recently went through multiple database upgrades. Some of the databases were upgraded using the DBUA utility. The DBUA utility does a nice job of modifying the database’s information in Grid Control to match the new database version. When doing the database upgrades, I also had to perform some manual upgrades. When you manually upgrade …
Oracle DBA Mentor
Oracle RAC Performance Tuning
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@sacrophyte That was an old recommendation which is probably out of date now. When I look at the 19c doc for that p… https://t.co/h0VwGJECvH
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Also in that note is "We decided to not promote our Database 20c Preview version to General Availability. Instead,… https://t.co/bvUcRKQ9gt
