This week I’ve seen an issue with a CONNECT BY query: for some reason Oracle 10.2.0.4 decided to build a weird plan (the query is weird too, but that’s not my point here 
). An explanation of why that happened looks interesting, so here it is.
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10.2.0.3 10.2.0.4 10.2.0.5 10g 10gR2 11.2.0.2 11.2.0.3 11g 11gR2 ANSI SQL ASH AWR benchmark bug bug-or-feature CBQT coalesce subquery connect by dynamic views Exadata FBI indexes join elimination memory MOS nested loops ORA-04031 Oracle JVM PDML poll presentations PX scripts shared cursors SPECjAppServer2004 sql_trace statistics Statspack subqueries subquery factoring subquery unnesting Tom Kyte tpt wait events wish list -
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