Why is postgresql update query so slow sometimes, even with index

Posted by Matija on Stack Overflow See other posts from Stack Overflow or by Matija
Published on 2010-05-24T19:38:33Z Indexed on 2010/05/24 19:41 UTC
Read the original article Hit count: 324

Filed under:

query

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postgresql

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index

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execution

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slowness

i have a simple update query (foo column type is BOOLEAN (default false)):

update tablename set foo = true where id = 234;

which "id" is set to (primary) key, and if i run "explain analyze" i got:

Index Cond: (id = 234)
Total runtime: 0.358 ms

but still, i have plenty of unexplained queries at slow log (pgfouine), which took more than 200s (?!):

Times executed: 99, Av. duration (s): 70

can anyone please explain, whats the reason for that? (1.5 mio rows in table, postgresql 8.4)

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