with about 8000 rows. For this table query:
SELECT MAX(MsgSeqNum),MAX(LogTimestamp) FROM ELT_tcli_MessageLog
WHERE LogTimestamp >= '0' AND IsFromCounterParty = 'Y' AND
IsOutOfSequence = 'N'
AND ConnectionName = 'DB_BENCHMARK'
AND LogTimestamp IN (SELECT MAX(LogTimestamp)
Hi,
First it will be good if you supply some EXPLAIN ANALYZE results from
your query.
Second, do you created the indexes which can be used with WHERE conditions.
And Third AFAK MAX doesn't use index. If you only need max then you can try:
ORDER BY DESC and LIMIT 1. But you can't use this i
with about 8000 rows. For this table query:
SELECT MAX(MsgSeqNum),MAX(LogTimestamp) FROM ELT_tcli_MessageLog
WHERE LogTimestamp >= '0' AND IsFromCounterParty = 'Y' AND
IsOutOfSequence = 'N'
AND ConnectionName = 'DB_BENCHMARK'
AND LogTimestamp IN (SELECT MAX(LogTimestamp)
"Alexander Dolgin" <[EMAIL PROTECTED]> writes:
> Does anybody have idea about reasons of such results?
Try converting the MAX() functions to queries that will use indexes.
See FAQ entry 4.7 "My queries are slow or don't make use of the
indexes. Why?"
regards, tom lane
---
Hi all,
We are developing some application that works with DB over JDBC. We've used
MSSQL before and trying to migrate to PostgreSQL now. Unfortunately problems
with performance are found. MSSQL with default configuration looks like much
faster then PostgreSQL on the same hardware (PostgreSQL8 rc5
