Hello List,
Well, I have a little bit tricky or I can say confused situation. We
have database for shares tradining. Beginning of every day, a couple
of tables will be truncted and we analyze the schema.
The situation is, when we truncate and analzye those tables,
statitiscs are updated as rum_rows=0, and blocks =0. The entire day,
about 100,000 records comes in each of those truncated tables. But,
for the optimizer, the data dictionary statistics provides nothing,
when there are records coming every second, we dont re-analyze again,
i.e. old statistics available to the optimizer.
How can we deal with this situation? Is it better to collect the
statistics before table get truncated, so that statistics available
for those tables to help otpimizer? If so, lets say, if our num_rows
says 100,000 and truncated the table, when records start coming in a
table, optimizer assumed that this table has 100,000 records, may be
the empty table starts filling from 10 records and keep growing.?
What is the best way to deal this?
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Best Regards,
Syed Jaffar Hussain
OCP 8i & 9i DBA,
Banque Saudi Fransi,
Saudi Arabia
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Received on Tue Sep 13 2005 - 04:32:43 CDT
