What is the best approach for solving sporadic Oracle performance problems on large systems? -


i have case specific query on complex view on large database @ customer site runs fast (4 or 5 seconds), , slow (7 minutes). view used summarise customer database activity in last couple of minutes, , typically produces less 1000 rows.

only once have been able reproduce problem, connecting customer database , running query use. other times have tried reproduce problem has run fast, during peak periods of user activity.

the query runs fast on customer testing database, has sporadic performance problem on production database.

the production database produces thousands of transactions every hour , has many users. test database not.

i suspect problem related else happening on system, rather view itself, don't know how test or prove that, or start looking.

what might be?

concurrency issues? .. view used read data, never writing.

i havent included code view doubt help.

any suggestions might or might find reason sporadic performance issues , fix it?


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