select into vs insert/select
I am looking for ways to speed up a procedure, which as a part of an overnight processing is called about 3000 times. The procedure begins by inserting about 20 rows into a temp table created outside of the proc. I thought that this may be better done by a select into statement because it is minimally logged etc. I am running the two versions of the statement (insert/select and select into) 2700 times on a quiet server and it seems that the insert/select is a bit faster, a second or two. Any ideas what I'm doing wrong? Is it my assumption about select into being faster or is my measurement flawed or the volume (about 20 rows) is too small to register a difference? Thank you for your help. Lubo Vitkov vitkov@un.org
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Lubo_Vitkov
3/8/2002 1:11:07 PM
sybase.ase.performance+tuning
2395 articles. 
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If you are clling the proc 2700 times, you are ofsetting the reduction in logging against the extra work done to create & (implicitly) drop the table. All round, you are probably insering more than 20 rows into the system tables creating the table, then deleting them again! With such a small set of rows, I would suggest your best bet would be to create the temp table once, then truncate it each time before you populate it in your procedure. This will get rid of all that expensive DDL and replace it with logging 20 inserts and one truncate. Also, if the stored procedure is being called by more than one connection, you could be getting recompilation as the temporary table ids change. You could either generate multiple duplicate stored procedures, one for each connection calling it, or implement traceflag 299. If you decide to implement traceflag 299, you should be aware that it significantly changes server behaviour, particularly with respect to temporary tables; the server doesn't check tables' schemas, just assuming they are the same as last time it accessed the object with the same name in the same database. If this isn't true, you will get really nasty errors. -- Roger Broadbent Technical Consultant Wilco International Ltd <Lubo_Vitkov> wrote in message news:27D00745C01D68F400486DBB85256B76.00486DF285256B76@webforums... > I am looking for ways to speed up a procedure, which as a part of an > overnight processing is called about 3000 times. > > The procedure begins by inserting about 20 rows into a temp table created > outside of the proc. I thought that this may be better done by a select > into statement because it is minimally logged etc. > > I am running the two versions of the statement (insert/select and select > into) 2700 times on a quiet server and it seems that the insert/select is a > bit faster, a second or two. > > Any ideas what I'm doing wrong? Is it my assumption about select into being > faster or is my measurement flawed or the volume (about 20 rows) is too > small to register a difference? > > Thank you for your help. > > Lubo Vitkov > vitkov@un.org
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Roger
3/8/2002 2:32:55 PM
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