Index ITL
Jonathan Lewis wrote a series of posts on topic of Index ITLs (interested transaction list), how and when they become huge and make index bigger in size – see this post with links to several other...
View ArticleCustom treedump
Not a tree, actually Just dump. Index dump. Custom index dump with blackjack and hookers (c) Check it out here if you haven’t seen this yet. Filed under: Oracle Tagged: indexes, scripts
View ArticleExtended statistics and function-based indexes
About a year ago I’ve discovered nice feature of Oracle 10gR2 CBO: to overcome an issue with calculated selectivity for predicates on multiple columns, it can use DISTINCT_KEYS of the available index....
View Article16K CR gets for UQ index scan? Easy. Kind of.
I planned to write on this for quite some time, but failed to do so. Sorry about that. Today I finally got time and desire to describe a situation from the title. It was observed on an Oracle 9.2.0.8...
View ArticleFBI trouble
In our application we extensively use a function-based index on an important table. Couple of days ago I’ve seen an interesting issue associated with this FBI, view and a GROUP BY query. I have to say...
View ArticleOIC(A) again
Issues with OICA/OIC (OPTIMIZER_INDEX_COST_ADJ/OPTIMIZER_INDEX_CACHING) parameters have already been mentioned many times. Recently I’ve noticed one more and I think I didn’t see this case somewhere...
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