Reducing shared pool latch contention

Question

I see a lot of shared pool latch contention on my 11gR2 database because there are over 100 identical schemas that run identical SQL. This causes lots of child cursors to be created. Scheduled jobs kick off hourly for every schema at the same time and that produces contention for shared pool latches for the same parent cursor.
I want to reduce that contention. Here's my question...
If I make the SQL text unique by either
(a) changing the object referenbes from "TableName" to "SchemaName.TableName", or
(b) adding a comment to the SQL that includes the SchemaName
...will that cause a separate cursor to be created in the shared pool?
I know in older versions even a change in a comment would cause Oracle to treat it as a separate statement. Is that still true in 11gR2?
FWIW cursor_sharing is set to EXACT.

Answer 1

Chuck1958 wrote:
If I make the SQL text unique by either
(a) changing the object referenbes from "TableName" to "SchemaName.TableName", or
(b) adding a comment to the SQL that includes the SchemaName
...will that cause a separate cursor to be created in the shared pool?
I know in older versions even a change in a comment would cause Oracle to treat it as a separate statement. Is that still true in 11gR2?
Yes:
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
SQL> show parameter cursor_sharing
NAME                                 TYPE        VALUE
cursor_sharing                       string      EXACT
SQL> select * /* schema1 */ from t where x=0;
no rows selected
SQL> select * /* schema2 */ from t where x=0;
no rows selected
SQL> select sql_id, child_number, sql_text
  2  from v$sql
  3  where sql_text like '%/* schema%';
SQL_ID        CHILD_NUMBER SQL_TEXT
4d03bxnvbw4ac            0 select * /* schema2 */ from t where x=0
76xtkkpvfqx1h            0 select * /* schema1 */ from t where x=0
b3zjvv0cfbhrx            0 select sql_id, child_number, sql_text fr
                           om v$sql where sql_text like '%/* schema
                           %'