Today in DBA class, the instructor matter-of-factly rattled off some characteristics on global temporary tables. Among these I just barely noticed him state that they generate REDO logging. I sat upright and asked him to confirm that I had heard him correctly, and indeed that is what he said. He... [Read More]
Track yer block changes
If you're using RMAN to take your backups, and are running Oracle 10g, do yourself a favor and enable block change tracking now. Prior to doing so, my level 1 incremental backups were scanning my entire database (~830 GB) and took over 5 hours. With BCT, level 1 incremental backups... [Read More]
selecting count(1) vs count(*)
Count me among the many who naively assumed that using count(1) instead of count(*) was somehow faster or less resource-intensive when counting the number records in a select query. Herod over at Yet Another Oracle DBA provides some more evidence on top of Tom Kyte's previous smackdown.
Happy New Year
I've got a backlog of Oracle stuffs to blog. In the words of my Data Structures professor at UW, "moer later."
Bind Variables: Not just for SELECTs!
Jonathan Lewis has a great piece on the importance of using bind variables in INSERT statements as well, avoiding expensive check constraint revalidation.