Yes, if I took the "count(descriptortermid)" part out, the query run very fast.
Thanks for you help. Guang > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of > [EMAIL PROTECTED] > Sent: Friday, June 06, 2003 4:00 PM > To: Multiple recipients of list ORACLE-L > Subject: Re: query run time vs IN list elements > > > ok i think i figured out what is going on. sorry for all the > emails. long day... > > Look at your query. You are including a count and a group by. > Both are costly operations. As you increase the values in > 'IN' you are increasing the size of the resultset. > > COUNT and group by need to work harder since the resultset > they are working off of is larger. > > Its easier to count to 10 and then group then it is to count > to 10,000 and group. > > > > -- Elapsed: 00:00:16.93 > select geneid ,genegroup, count(descriptortermid) > from gene2disease2H > where geneid in > (165383,165409,165603,166524,149490,166141,166342,166829,16683 > 2,167771,16849 > 7,163450,163817, > 165751,167437,167438,167476,164118,166054,168728,162967,164533 > ,164545,163212 > , 168501) > group by geneid, genegroup; > > > > > > From: "gmei" <[EMAIL PROTECTED]> > > Date: 2003/06/06 Fri PM 02:09:44 EDT > > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > > Subject: query run time vs IN list elements > > > > Hi: > > > > Today I have something I don't fully understand. I have > oracle 8173 on Sun > > Solaris. I have the following query that runs pretty fast > when the number of > > elements in the "IN" list is small. But if I kept adding > more "geneids" in > > the IN list, my query time increased dramatically. Now > there is no index on > > any columns on the table. I got very similar results even > if I created index > > on gene2disease2H.geneid. So this seem to suggest this > situation has not to > > do with index. > > > > So my question is: why did I see the sigificant time > increase when I only > > add one more geneid? > > > > TIA. > > > > Guang > > > > SQL> desc gene2disease2H > > Name Null? Type > > ----------------------------------------- -------- > ------------------ > > GENEID NUMBER > > GENEGROUP VARCHAR2(25) > > DESCRIPTORTERMID NOT NULL NUMBER > > NUMABSTRACTS NUMBER > > DATESTAMP DATE > > > > > > -- Elapsed: 00:00:08.32 > > select geneid ,genegroup, count(descriptortermid) > > from gene2disease2H > > where geneid in > > > (165383,165409,165603,166524,149490,166141,166342,166829,16683 > 2,167771,16849 > > 7,163450,163817, > > > 165751,167437,167438,167476,164118,166054,168728,162967,164533 > ,164545,163212 > > ) > > group by geneid, genegroup; > > > > > > -- Elapsed: 00:00:16.93 > > select geneid ,genegroup, count(descriptortermid) > > from gene2disease2H > > where geneid in > > > (165383,165409,165603,166524,149490,166141,166342,166829,16683 > 2,167771,16849 > > 7,163450,163817, > > > 165751,167437,167438,167476,164118,166054,168728,162967,164533 > ,164545,163212 > > , 168501) > > group by geneid, genegroup; > > > > > > > > -- Elapsed: 00:00:31.97 > > select geneid ,genegroup, count(descriptortermid) > > from gene2disease2H > > where geneid in > > > (165383,165409,165603,166524,149490,166141,166342,166829,16683 > 2,167771,16849 > > 7,163450,163817, > > > 165751,167437,167438,167476,164118,166054,168728,162967,164533 > ,164545,163212 > > , 168501,151968) > > group by geneid, genegroup; > > > > > > -- Elapsed: 00:01:61.51 > > select geneid ,genegroup, count(descriptortermid) > > from gene2disease2H > > where geneid in > > > (165383,165409,165603,166524,149490,166141,166342,166829,16683 > 2,167771,16849 > > 7,163450,163817, > > > 165751,167437,167438,167476,164118,166054,168728,162967,164533 > ,164545,163212 > > , 168501,151968, > > 166472) > > group by geneid, genegroup; > > > > > > -- Elapsed: 00:02:124.63 > > select geneid ,genegroup, count(descriptortermid) > > from gene2disease2H > > where geneid in > > > (165383,165409,165603,166524,149490,166141,166342,166829,16683 > 2,167771,16849 > > 7,163450,163817, > > > 165751,167437,167438,167476,164118,166054,168728,162967,164533 > ,164545,163212 > > , 168501,151968, > > 166472,167771) > > group by geneid, genegroup; > > > > > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > -- > > Author: gmei > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > San Diego, California -- Mailing list and web > hosting services > > > --------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > > the message BODY, include a line containing: UNSUB ORACLE-L > > (or the name of mailing list you want to be removed from). You may > > also send the HELP command for other information (like subscribing). > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: <[EMAIL PROTECTED] > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: gmei INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
