Here, here to that. We are using it in production now and have achieved excellent results. eg A query that was taking almost 2 hours, down to sub-second !!!
I'm sure Mark Leith from the list won;t mind me giving him a shameless plug. If you are in the UK visit http://www.cool-tools.co.uk to download a copy from them. Regards Lee -----Original Message----- Sent: 08 August 2002 18:49 To: Multiple recipients of list ORACLE-L Paula, I'm sorry that I don't have an answer for you with regard to this particular query. However, I've been using a SQL optimization tool called SQL*Expert (or a more feature-rich tool called DB*Expert) that is sold by Leccotech. I've had fantastic results with this tool and I can't recommend it highly enough for SQL that is tough to tune manually. The tool will generate a vast number of permutations of possible SQL that contains switched order of lines in the code, arithmetic changes, moving variables from one side of the equal sign to the other, and possible hints. Once all these possibilites are generated, it is extremely easy to run them, even with bind variables. You can even configure it that you want to run all the options for a short period of time and stop trying them if they don't succeed right away. You can download a test copy and probably get a short-term key from the sales rep within a day. It is pretty intuitive and I got it up and running out-of-the-box within 24 hours. I believe their web site is www.leccotech.com. They've got a button on there to register with them and download the tool. Then you can contact the sales rep and have him give you a short-term key before you can install. Like I said, I've achieved super results tuning with this tool. It's really cut down my tuning time and suggested alternatives that I would have never thought of, not to mention whipping them all out in a very short amount of time. I should mention that I am not affiliated with the vendor, Leccotech, other than as a customer. Cherie Machler Oracle DBA Gelco Information Network [EMAIL PROTECTED] tate.fl.us To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> Sent by: cc: [EMAIL PROTECTED] Subject: RE: SOME SOLUTIONS! 08/08/02 10:43 AM Please respond to ORACLE-L Okay, Just going from #1 query to #2 query went from subsecond response to 6 secs. Not to mention for each sum it gets progressively worse!!!. The explain plan is exactly the same and I ran the sort query below and no rows returned. rem truncate table plan_table; set timing on; rem explain plan set statement_id='RON' for select /*+ INDEX(mv_birthstat,ndx_mvyr) */ brth_mthr_res_newco_code County,count(*), -- sum(cert_chld_brth_year) Num1 --sum(decode(greatest(cert_chld_brth_year,1996), least(cert_chld_brth_year,1998 ), 1, 0)) / 3 Num2, --sum(decode(greatest(cert_chld_brth_year,1997), least(cert_chld_brth_year,1999 ), 1, 0)) / 3 Num3 from mv_birthstat where cert_chld_brth_year between '1995' and '1999' and brth_mthr_res_state_code='10' and brth_mthr_age between 15 and 41 group by brth_mthr_res_newco_code; /*+ INDEX(mv_birthstat,ndx_mvyr) */ brth_mthr_res_newco_code County, sum(cert_chld_brth_year) Num1 --sum(decode(greatest(cert_chld_brth_year,1996), least(cert_chld_brth_year,1998 ), 1, 0)) / 3 Num2, --sum(decode(greatest(cert_chld_brth_year,1997), least(cert_chld_brth_year,1999 ), 1, 0)) / 3 Num3 from mv_birthstat where cert_chld_brth_year between '1995' and '1999' and brth_mthr_res_state_code='10' and brth_mthr_age between 15 and 41 group by brth_mthr_res_newco_code; WHY WHY WHY WHY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -----Original Message----- Sent: Wednesday, August 07, 2002 11:37 PM To: Multiple recipients of list ORACLE-L Paula, Sorry to join this thread late, if I am rehashing just igonre. I notice that your 'numbers' are surrounded by quotes, which will implicitly disable the index on those columns, perhaps the cause of the index hint. Are those columns text or numbers? If numbers, take out the quotes (and perhaps the hint) and rerun query. Also, your aggregate functions will cause sorting - are you sorting to disk? See the query at the end of this to find out. If so, perhaps a larger sort_area_size and sort_area_retained_size might be in order. Again, ignore if redundant. Run this to look at sorting: select t1.tablespace , extents , sum( t1.blocks * to_number( t3.value ) ) / 1024 / 1024 mb_used , sum( t1.extents ) tot_extents , t2.username , t2.osuser , t2.SID ||','|| t2.serial# SID_PID , t4.spid , t5.sql_text , t1.segtype from v$sort_usage t1 ,v$session t2 ,v$parameter t3 ,v$process t4 ,v$sqlarea t5 where t1.SESSION_ADDR = t2.SADDR and t3.name = 'db_block_size' and (t2.PROCESS=t4.SPID or t2.paddr = t4.addr) and t2.sql_address=t5.address and t2.status = 'ACTIVE' group by t1.tablespace , t2.username , t2.osuser , t2.machine , t2.schemaname , t2.program , t2.SID ||','|| t2.serial# , t4.spid , t5.sql_text , t1.segtype , segfile# , extents / hth, Jack --- [EMAIL PROTECTED] wrote: > Guys, > > By changing objects to noparallel, creating > bitmapped index containing all > columns that was local and prefixed. Moving to > 8.1.7.4 I was able to > improve performance from minutes to many seconds to > seconds for the > following (not using 'in' or 'or' in predicate > helped too): > select > /*+ INDEX(mv_birthstat,ndx_mvyr) */ > brth_mthr_res_newco_code County,count(*) > from mv_birthstat > where cert_chld_brth_year between '1995' and '1999' > and brth_mthr_res_state_code='10' > and brth_mthr_age between 15 and 41 > group by brth_mthr_res_newco_code; > > Then adding the following the query takes 15 seconds > again - any ideas for > speeding it up? Please don't say hire a new DBA. I > have really been > working on this hard with only annoying input from > Oracle's technical > support and a lot of good reference manuals > (Jonathon Lewis, 101 Perf. > Tuning, Oracle SQL - Guy Harrison) for my > companions. Great I know but > lonely. > > select > /*+ INDEX(mv_birthstat,ndx_mvyr) */ > brth_mthr_res_newco_code County > sum(decode(greatest(cert_chld_birth_year,1995), > least(cert_chld_birth_year,1997), 1, 0)) / 3 Num1, > sum(decode(greatest(cert_chld_birth_year,1996), > least(cert_chld_birth_year,1998), 1, 0)) / 3 Num2, > sum(decode(greatest(cert_chld_birth_year,1997), > least(cert_chld_birth_year,1999), 1, 0)) / 3 Num3 > from mv_birthstat > where cert_chld_brth_year between '1995' and '1999' > and brth_mthr_res_state_code='10' > and brth_mthr_age between 15 and 41 > group by brth_mthr_res_newco_code; > > I am going to try the sums in a outer query. > > > > -----Original Message----- > Sent: Wednesday, August 07, 2002 4:45 PM > To: Stankus, Paula G; '[EMAIL PROTECTED]' > > > Mother's state 80% are in Florida. However, this is > a 'local' prefixed > bitmap index. I would expect to use year to > eliminate partion. then w/in > year by state - second col. in query. > > -----Original Message----- > Sent: Wednesday, August 07, 2002 4:35 PM > To: Stankus, Paula G; '[EMAIL PROTECTED]' > > > BTW, > > SQL> select blocks from dba_tables > 2 where table_name = 'MV_BIRTHSTAT'; > > BLOCKS > ---------- > 236542 > > SQL> select clustering_factor from user_indexes > 2 where table_name='MV_BIRTHSTAT'; > > CLUSTERING_FACTOR > ----------------- > 1657 > 170 > > -----Original Message----- > Sent: Wednesday, August 07, 2002 4:28 PM > To: Stankus, Paula G; '[EMAIL PROTECTED]' > > > Help - weird performance problem!!! > > ---------------------------------------------------------------------------- > ---- > | Operation | Name | Rows | > Bytes| Cost | Pstart| > Pstop | > ---------------------------------------------------------------------------- > ---- > | SELECT STATEMENT | | 1 | > 5 | 9331 | | > | > | SORT AGGREGATE | | 1 | > 5 | | | > | > | SORT AGGREGATE | | 1 | > 5 | | | > | > | INLIST ITERATOR | | | > | | | > | > | PARTITION RANGE ITERAT| | | > | |KEY(I) > |KEY(I) | > | BITMAP CONVERSION COU| | | > | | | > | > | BITMAP INDEX RANGE S|NDX_MVYRS | | > | |KEY(I) > |KEY(I) | > > Cost higher but less than a second. > > Ignore the cost - higher cost was sign. > Faster!!!!!Does Key(*) mean it is > doing part. Elimin. I think so but can you see the > inlist? > > Very fast with all years involved. Then added > predicate: > > select > /*+ INDEX(mv_birthstat,ndx_mvyrstatecoage) */ > count(*) from mv_birthstat > where cert_chld_brth_year > in('1995','1996','1997','1998','1999') > and brth_MTHR_res_STATE_CODE = '10'; > > - snails crawl by just adding the additional > column!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! > __________________________________________________ Do You Yahoo!? Yahoo! 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