wangqi wrote: > An SQL execution is very slow. > What can I do to makes it faster。 Without knowing more about the version of PostgreSQL, your PostgreSQL configuration, your schema (including indexes), and your hardware, it's hard to give advice. http://wiki.postgresql.org/wiki/SlowQueryQuestions A wild guess on the evidence we have is that you might benefit from an index on MCL.ctid if you don't already have one. -Kevin
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