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Asked: 2026-05-11T12:45:55+00:00

The Query I’m writing runs fine when looking at the past few days, once

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The Query I’m writing runs fine when looking at the past few days, once I go over a week it crawls (~20min). I am joining 3 tables together. I was wondering what things I should look for to make this run faster. I don’t really know what other information is needed for the post.

EDIT: More info: db is Sybase 10. Query:

SELECT a.id, a.date, a.time, a.signal, a.noise, b.signal_strength, b.base_id, b.firmware, a.site, b.active, a.table_key_id FROM adminuser.station AS a JOIN adminuser.base AS b ON a.id = b.base_id WHERE a.site = 1234 AND a.date >= '2009-03-20'

I also took out the 3rd JOIN and it still runs extremely slow. Should I try another JOIN method?

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1 Answer

  1. I don’t know Sybase 10 that well, but try running that query for say 10-day period and then 10 times, for each day in a period respectively and compare times. If the time in the first case is much higher, you’ve probably hit the database cache limits.

    The solution is than to simply run queries for shorter periods in a loop (in program, not SQL). It works especially well if table A is partitioned by date.

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