Performance problem on parsing on remote databases.

Question

Hello experts,
We are facing a performance issue on ORACLE 9.2.0.5
1. We do a select on on a SYNONYM (S_ppm) of a VIEW(ppm) . The View is union
of two tables on two databases on two solaris machines (used database links).
create or replace view ppm as select * from ppm_P UNION ALL SELECT * FROM creactor.ppm_P@SMFD ;
drop synonym S_ppm;
create synonym S_ppm for ppm;
We get the tkprof results as for the select statement on (S_ppm)
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 7278 3.54 7.88 0 0 1015 0
Execute 7616 1.09 1.53 0 0 0 0
Fetch 7109 2.36 4.03 0 13722 0 6098
total 22003 7.00 13.44 0 13722 1015 6098
Misses in library cache during parse: 5
2. We increase the machine to three . Three database on three solaris machine.
create or replace view ppm as select * from ppm_P UNION ALL SELECT * FROM creactor.ppm_P@SMFD UNION ALL SELECT * FROM creactor.ppm_P@SMFE;
drop synonym S_ppm;
create synonym S_ppm for ppm;
We get the tkprof results as for the select statement on (S_ppm)
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 6214 4.96 11.96 0 1 872 0
Execute 6503 1.00 1.31 0 0 0 0
Fetch 6069 3.40 6.28 0 11708 0 5205
total 18786 9.37 19.56 0 11709 872 5205
Misses in library cache during parse: 5
3. Similarly we increase the machine and database to four
We get the tkprof results as for the select statement on (S_ppm)
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 6473 7.19 17.79 0 1 908 0
Execute 6774 1.14 1.43 0 0 0 0
Fetch 6323 4.87 9.46 0 12201 0 5424
total 19570 13.21 28.70 0 12202 908 5424
Misses in library cache during parse: 5
3. Similarly we increase the machine and database to five
We get the tkprof results as for the select statement on (S_ppm)
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 6095 8.58 21.91 0 0 849 0
Execute 6379 1.16 1.42 0 0 0 0
Fetch 5954 5.99 11.78 0 11494 0 5108
total 18428 15.73 35.12 0 11494 849 5108
We see that PARSING elapsed time increases abnormally.
From 7.88 to 11.96 to 17.79 to 21.91
What can be the reason ? and how can we improve on that ?
We found a bug on ORACLE 9.2.0.5
Metalink Bug Id= 4913460 "A soft parse occurs each time a query having embedded remote tables over a database
link is executed."
But ORACLE has no patch for 9.2.0.5 and we cant upgrade to any higher versions?
Can any one help ?
Thanks and regards
Rinchen

Answer 1

jr_wastebasket.purge_insignificant_versions helps, I drop old versions of forms
Edited by: Vazha_Mantua on Mar 27, 2009 9:24 AM