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Enhanced Subquery Optimizations in Oracle
While googling I found a fresh article from Oracle for the VLDB journal: Enhanced Subquery Optimization in Oracle. It primarily discusses subqueries – how Oracle deals with them on optimization and at...
View ArticlePQ_DISTRIBUTE enhancement – Part 1
Oracle 11g has introduced a hell lot of new features related to Parallel Execution – like statement queuing, in-memory PX and auto-DOP, to name a few. There are also small bits of enhancements here and...
View ArticleEnabling constraint in parallel
Recently I did some tuning of data generation scripts, which purpose is to build large amount of representative data for application testing. Direct-path inserts are in use and as a prerequisite all...
View ArticleLimiting the Degree of Parallelism via Resource Manager and a gotcha
This might be something very obvious for the reader but I had an interesting revelation recently when implementing parallel_degree_limit_p1 in a resource consumer group. My aim was to prevent users...
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