How To Manually Install XML DB On Oracle 11g
ABCdba: Due to Oracle Bug 9818995, if catqm.sql is used then not all installation steps are performed by this script… This document explains the full set of steps that need to be taken in order to...
View Article★ If you think you disabled Automatic Memory Management in Oracle DB 11.2,...
Kurt Van Meerbeeck points out the fact that SGA re-sizes are occurring after an upgrade to 11.2 despite the fact that automatic memory management (AMM/ASMM) is disabled via the MEMORY_TARGET and...
View ArticleWhat you need to know about calling functions from SQL
Tom Kyte: When calling functions from SQL, you had better not rely on how often the functions get called, in what order, or whatever. In short, assume nothing. And remember – SQL rewrites kick in and...
View ArticleOracle DB 11g Password Expiry Gotcha
Jeff Hunter: Something I discovered recently is that the DEFAULT profile for Oracle 11g sets the PASSWORD_LIFE_TIME to 180 instead of UNLIMTED by default. Applications will encounter an “ORA-28002:...
View Article★ User Exceptions Gotcha, When an Error Appears as a Success
This is a guest post by David Clement, a veteran database engineer, a coworker and a friend of mine. You can find him online at davidclement.org. Here is an interesting feature that’s worth knowing...
View Article★ Gathering fixed object stats may reduce recompilation time post Oracle upgrade
Mike Dietrich: In larger sized databases with many objects and components our recommendation is always to gather first fixed object stats prior to start the recompilation. Some time ago I’ve learned...
View Article★ Handy Oracle Scheduler Troubleshooting Tip
This is a guest post by David Clement, a veteran database engineer and a friend of mine. You can find him online at davidclement.org. I’ve found the following query handy for investigating an ORA-12012...
View Article★ What is the Oracle Learning Library?
It’s a really useful resource. The Oracle Learning Library allows you to search for free online learning content on the internet. The content comes from a variety of sources, including OTN, YouTube and...
View ArticleCode Comments Gone Wrong
Dimitrios Kalogirou offers good advice: Write self descriptive code ! Your code should be read like sentences. Avoid smart shortcuts and tricks because they break the reading… I use code comments when...
View ArticleNever Ever Do That
ALTER TABLE sys.dual ADD (dummy2 VARCHAR2(1)); Tom Kyte: You never, never never never, as in never ever – touch any of the SYS tables – not to insert into them, not to delete from them, not to update...
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★ When Versioning Support Interferes With Saving Your Relational Model
To reverse engineer an existing database into a relational model, I used SQL Developer Data Modeler, a free data modeling and database design tool from Oracle. I had a problem with the tool. I could...
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