AUTH_CHECK_MISMATCH BIND_MISMATCH LANGUAGE_MISMATCH
when I run SQL (further below) I get significant number of results of AUTH_CHECK_MISMATCH LANGUAGE_MISMATCH
Just wondering if APEX 4.1.1 has not installed correctly?
eg1 -AUTH_CHECK_MISMATCH BIND_MISMATCH LANGUAGE_MISMATCH
SELECT SHORTCUT_NAME, ID FROM WWV_FLOW_SHORTCUTS WHERE FLOW_ID = :B3 AND (BUILD_OPTION IS NULL OR (BUILD_OPTION > 0 AND (:B2 IS NULL OR INSTR(:B2 ,':'||BUILD_OPTION||':') = 0) ) OR (BUILD_OPTION < 0 AND (:B1 IS NOT NULL AND INSTR(:B1 ,':'||(0-BUILD_OPTION)||':') = 0) ) ) ORDER BY SHORTCUT_NAMEeg2 - AUTH_CHECK_MISMATCH LANGUAGE_MISMATCH
SELECT ROWID FROM WWV_FLOW_DATA WHERE FLOW_INSTANCE = :B3 AND ITEM_ID = :B2 AND ITEM_NAME = :B1 FOR UPDATE NOWAIT"
select version_count,reason,sql_text from (
select
address,''
||decode(max( UNBOUND_CURSOR),'Y', ' UNBOUND_CURSOR')
||decode(max( SQL_TYPE_MISMATCH),'Y', ' SQL_TYPE_MISMATCH')
||decode(max( OPTIMIZER_MISMATCH),'Y', ' OPTIMIZER_MISMATCH')
||decode(max( OUTLINE_MISMATCH),'Y', ' OUTLINE_MISMATCH')
||decode(max( STATS_ROW_MISMATCH),'Y', ' STATS_ROW_MISMATCH')
||decode(max( LITERAL_MISMATCH),'Y', ' LITERAL_MISMATCH')
||decode(max( EXPLAIN_PLAN_CURSOR),'Y', ' EXPLAIN_PLAN_CURSOR')
||decode(max( BUFFERED_DML_MISMATCH),'Y', ' BUFFERED_DML_MISMATCH')
||decode(max( PDML_ENV_MISMATCH),'Y', ' PDML_ENV_MISMATCH')
||decode(max( INST_DRTLD_MISMATCH),'Y', ' INST_DRTLD_MISMATCH')
||decode(max( SLAVE_QC_MISMATCH),'Y', ' SLAVE_QC_MISMATCH')
||decode(max( TYPECHECK_MISMATCH),'Y', ' TYPECHECK_MISMATCH')
||decode(max( AUTH_CHECK_MISMATCH),'Y', ' AUTH_CHECK_MISMATCH')
||decode(max( BIND_MISMATCH),'Y', ' BIND_MISMATCH')
||decode(max( DESCRIBE_MISMATCH),'Y', ' DESCRIBE_MISMATCH')
||decode(max( LANGUAGE_MISMATCH),'Y', ' LANGUAGE_MISMATCH')
||decode(max( TRANSLATION_MISMATCH),'Y', ' TRANSLATION_MISMATCH')
||decode(max( INSUFF_PRIVS),'Y', ' INSUFF_PRIVS')
||decode(max( INSUFF_PRIVS_REM),'Y', ' INSUFF_PRIVS_REM')
||decode(max( REMOTE_TRANS_MISMATCH),'Y', ' REMOTE_TRANS_MISMATCH')
||decode(max( LOGMINER_SESSION_MISMATCH),'Y', ' LOGMINER_SESSION_MISMATCH')
||decode(max( INCOMP_LTRL_MISMATCH),'Y', ' INCOMP_LTRL_MISMATCH')
||decode(max( OVERLAP_TIME_MISMATCH),'Y', ' OVERLAP_TIME_MISMATCH')
||decode(max( MV_QUERY_GEN_MISMATCH),'Y', ' MV_QUERY_GEN_MISMATCH')
||decode(max( USER_BIND_PEEK_MISMATCH),'Y', ' USER_BIND_PEEK_MISMATCH')
||decode(max( TYPCHK_DEP_MISMATCH),'Y', ' TYPCHK_DEP_MISMATCH')
||decode(max( NO_TRIGGER_MISMATCH),'Y', ' NO_TRIGGER_MISMATCH')
||decode(max( FLASHBACK_CURSOR),'Y', ' FLASHBACK_CURSOR')
||decode(max( ANYDATA_TRANSFORMATION),'Y', ' ANYDATA_TRANSFORMATION')
||decode(max( TOP_LEVEL_RPI_CURSOR),'Y', ' TOP_LEVEL_RPI_CURSOR')
||decode(max( DIFFERENT_LONG_LENGTH),'Y', ' DIFFERENT_LONG_LENGTH')
||decode(max( LOGICAL_STANDBY_APPLY),'Y', ' LOGICAL_STANDBY_APPLY')
||decode(max( DIFF_CALL_DURN),'Y', ' DIFF_CALL_DURN')
||decode(max( BIND_UACS_DIFF),'Y', ' BIND_UACS_DIFF')
||decode(max( PLSQL_CMP_SWITCHS_DIFF),'Y', ' PLSQL_CMP_SWITCHS_DIFF')
||decode(max( CURSOR_PARTS_MISMATCH),'Y', ' CURSOR_PARTS_MISMATCH')
||decode(max( STB_OBJECT_MISMATCH),'Y', ' STB_OBJECT_MISMATCH')
||decode(max( PQ_SLAVE_MISMATCH),'Y', ' PQ_SLAVE_MISMATCH')
||decode(max( TOP_LEVEL_DDL_MISMATCH),'Y', ' TOP_LEVEL_DDL_MISMATCH')
||decode(max( MULTI_PX_MISMATCH),'Y', ' MULTI_PX_MISMATCH')
||decode(max( BIND_PEEKED_PQ_MISMATCH),'Y', ' BIND_PEEKED_PQ_MISMATCH')
||decode(max( MV_REWRITE_MISMATCH),'Y', ' MV_REWRITE_MISMATCH')
||decode(max( ROLL_INVALID_MISMATCH),'Y', ' ROLL_INVALID_MISMATCH')
||decode(max( OPTIMIZER_MODE_MISMATCH),'Y', ' OPTIMIZER_MODE_MISMATCH')
||decode(max( PX_MISMATCH),'Y', ' PX_MISMATCH')
||decode(max( MV_STALEOBJ_MISMATCH),'Y', ' MV_STALEOBJ_MISMATCH')
||decode(max( FLASHBACK_TABLE_MISMATCH),'Y', ' FLASHBACK_TABLE_MISMATCH')
||decode(max( LITREP_COMP_MISMATCH),'Y', ' LITREP_COMP_MISMATCH')
reason
from
v$sql_shared_cursor
group by
address
) join v$sqlarea using(address) where version_count>2
and parsing_schema_name like 'APEX_0%'
order by version_count desc,address
I'm seeing the same thing now, APEX 4.0. Two-node setup. Please let me know if you've found any reason why, I'm checking the environment settings across both nodes now.
Similar Messages
-
AUTH_CHECK_MISMATCH and LANGUAGE_MISMATCH
Hi all
I have identified that same sql_id has 4 child_number in v$sql, in order to find out what is the reason of execution changes I looked into v$sql_shared_cursor with sql_id and I saw
AUTH_CHECK_MISMATCH=Y and LANGUAGE_MISMATCH=Y for 4 child sql ;
1-why value=y for all childs ? doesnt have to someone has value=N ?
2-What is the exact mean of these mismatchs give me some example ? when these mismatchs happens ?
3-V$Sql_Shared_Cursor is the best view to find child number changes or execution changes ?
Best Regards
10.2.2
Edited by: EB on Feb 5, 2009 5:36 PMEB wrote:
I have identified that same sql_id has 4 child_number in v$sql, in order to find out what is the reason of execution changes I looked into v$sql_shared_cursor with sql_id and I saw
AUTH_CHECK_MISMATCH=Y and LANGUAGE_MISMATCH=Y for 4 child sql ;
2-What is the exact mean of these mismatchs give me some example ? when these mismatchs happens ?The AUTH_CHECK_MISMATCH is usually indicating that a VPD/RLS policy is active and therefore the SQL is actually unique and not sharable, although not visible in V$SQL.
See e.g. AskTom for an example: http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:62048567543425#673597500346350876
The LANGUAGE_MISMATCH indicates that different NLS related settings, e.g. different NLS_SORT or NLS_COMP settings were used that influence the meaning/sort output/filter predicates and therefore are not sharable.
You can try it yourself by simply executing a query like "SELECT * FROM <TABLE> ORDER BY <VARCHAR_COL>" twice, the first time using a binary sort order ("ALTER SESSION SET NLS_SORT = binary"), the second time using a different sort order like "ALTER SESSION SET NLS_SORT = german". Then you'll find two child cursors for this statement.
A quick test with 10g XE though revealed that a different NLS_SORT setting already showed a 'Y' in both the AUTH_CHECK_MISMATCH and LANGUAGE_MISMATCH columns, although I'm not sure why the AUTH_CHECK_MISMATCH column shows 'Y' in this particular case.
So may be you simply have sessions that use different NLS settings which could already be caused by different NLS client settings.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/ -
Query taking longer to execute the second time.
Hello,
I have a query joing few tables and views and when i execute it the first them, it executes within a seconds, immediately if i execute it the second time it takes about 40 seconds to execute. I am using Oracle 11g [11.2.0.1.0].
Please find the TKPROF output.
call count cpu elapsed disk query current rows
Parse 1 0.26 0.24 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 23 0.81 0.82 0 5610 0 326
total 25 1.07 1.07 0 5610 0 326
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 127
call count cpu elapsed disk query current rows
Parse 1 0.23 0.23 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 23 41.01 41.00 0 38218 0 326
total 25 41.24 41.24 0 38218 0 326
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 127Hi Nicholay,
VPD is not being used in our application. ArcSDE Multi-Versionsed View uses some functions in VW_ objects. In Oracle 10g I dont have this issue.
Here is the output from V$SQL_SHARED_CURSOR.
"SQL_ID" "ADDRESS" "CHILD_ADDRESS" "CHILD_NUMBER" "UNBOUND_CURSOR" "SQL_TYPE_MISMATCH" "OPTIMIZER_MISMATCH" "OUTLINE_MISMATCH" "STATS_ROW_MISMATCH" "LITERAL_MISMATCH" "FORCE_HARD_PARSE" "EXPLAIN_PLAN_CURSOR" "BUFFERED_DML_MISMATCH" "PDML_ENV_MISMATCH" "INST_DRTLD_MISMATCH" "SLAVE_QC_MISMATCH" "TYPECHECK_MISMATCH" "AUTH_CHECK_MISMATCH" "BIND_MISMATCH" "DESCRIBE_MISMATCH" "LANGUAGE_MISMATCH" "TRANSLATION_MISMATCH" "BIND_EQUIV_FAILURE" "INSUFF_PRIVS" "INSUFF_PRIVS_REM" "REMOTE_TRANS_MISMATCH" "LOGMINER_SESSION_MISMATCH" "INCOMP_LTRL_MISMATCH" "OVERLAP_TIME_MISMATCH" "EDITION_MISMATCH" "MV_QUERY_GEN_MISMATCH" "USER_BIND_PEEK_MISMATCH" "TYPCHK_DEP_MISMATCH" "NO_TRIGGER_MISMATCH" "FLASHBACK_CURSOR" "ANYDATA_TRANSFORMATION" "INCOMPLETE_CURSOR" "TOP_LEVEL_RPI_CURSOR" "DIFFERENT_LONG_LENGTH" "LOGICAL_STANDBY_APPLY" "DIFF_CALL_DURN" "BIND_UACS_DIFF" "PLSQL_CMP_SWITCHS_DIFF" "CURSOR_PARTS_MISMATCH" "STB_OBJECT_MISMATCH" "CROSSEDITION_TRIGGER_MISMATCH""PQ_SLAVE_MISMATCH" "TOP_LEVEL_DDL_MISMATCH" "MULTI_PX_MISMATCH" "BIND_PEEKED_PQ_MISMATCH" "MV_REWRITE_MISMATCH" "ROLL_INVALID_MISMATCH" "OPTIMIZER_MODE_MISMATCH" "PX_MISMATCH" "MV_STALEOBJ_MISMATCH" "FLASHBACK_TABLE_MISMATCH" "LITREP_COMP_MISMATCH" "PLSQL_DEBUG" "LOAD_OPTIMIZER_STATS" "ACL_MISMATCH" "FLASHBACK_ARCHIVE_MISMATCH" "LOCK_USER_SCHEMA_FAILED" "REMOTE_MAPPING_MISMATCH" "LOAD_RUNTIME_HEAP_FAILED" "HASH_MATCH_FAILED" "PURGED_CURSOR" "BIND_LENGTH_UPGRADEABLE"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD49C88" "1" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD3A7B8" "0" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD46A40" "2" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD3A7B8" "0" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD49C88" "1" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD46A40" "2" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD3A7B8" "0" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD49C88" "1" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N"
"7rtqvjtyp06k9" "000007FFABD3A918" "000007FFABD46A40" "2" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" "N" Edited by: 955237 on 29 Aug, 2012 1:57 AM -
Hi all
I am seeing too many AUTH_CHECK_MISMATCH in v$sql_shared_cursor.
There is and .net application that login oracle via user X ,all packages these using by application are in user Y.X has only execute permission on all Y packages.
This might be reason of AUTH_CHECK_MISMATCH ? Or have you any advice ?
there is not same table names in diffrent schemas and there is not synonyms that related problem tables.Also I am not using VPD.Are you sure that there is no change on NLS related values?
If you have LANGUAGE_MISMATCH without any NLS modification, it would be a bug.
1. You might like to have more investigation using v$ses_optimizer_env and/or v$sql_optimizer_env views.
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/dynviews_3.htm#REFRN30308
http://download.oracle.com/docs/cd/B28359_01/server.111/b28320/dynviews_3.htm#REFRN30311
Could you post the result when you have any meanginful comparsion through these views?
2. And search metalink for bugs.
==================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================== -
Gather_Plan_Statistics + DBMS_XPLAN A-rows for parallel queries
Looks like gather_plan_statistics + dbms_xplan displays incorrect A-rows for parallel queries. Is there any way to get the correct A-rows for a parallel query?
Version details:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi on HPUX
Create test tables:
-- Account table
create table test_tacprof
parallel (degree 2) as
select object_id ac_nr,
object_name ac_na
from all_objects;
alter table test_tacprof add constraint test_tacprof_pk primary key (ac_nr);
-- Account revenue table
create table test_taccrev
parallel (degree 2) as
select apf.ac_nr ac_nr,
fiv.r tm_prd,
apf.ac_nr * fiv.r ac_rev
from (select rownum r from all_objects where rownum <= 5) fiv,
test_tacprof apf;
alter table test_taccrev add constraint test_taccrev_pk primary key (ac_nr, tm_prd);
-- Table to hold query results
create table test_4accrev as
select apf.ac_nr, apf.ac_na, rev.tm_prd, rev.ac_rev
from test_taccrev rev,
test_tacprof apf
where 1=2;
Run query with parallel dml/query disabled:
ALTER SESSION DISABLE PARALLEL QUERY;
ALTER SESSION DISABLE PARALLEL DML;
INSERT INTO test_4accrev
SELECT /*+ gather_plan_statistics */
apf.ac_nr,
apf.ac_na,
rev.tm_prd,
rev.ac_rev
FROM test_taccrev rev, test_tacprof apf
WHERE apf.ac_nr = rev.ac_nr AND tm_prd = 4;
SELECT *
FROM TABLE (DBMS_XPLAN.display_cursor (NULL, NULL, 'ALLSTATS LAST'));
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Use
|* 1 | HASH JOIN | | 1 | 30442 | 23412 |00:00:00.27 | 772 | 1810K| 1380K| 2949K (0)|
| 2 | TABLE ACCESS FULL| TEST_TACPROF | 1 | 26050 | 23412 |00:00:00.01 | 258 | | |
|* 3 | TABLE ACCESS FULL| TEST_TACCREV | 1 | 30441 | 23412 |00:00:00.03 | 514 | | |
ROLLBACK ;
A-rows are correctly reported with no parallel.
Run query with parallel dml/query enabled:
ALTER SESSION enable PARALLEL QUERY;
alter session enable parallel dml;
insert into test_4accrev
select /*+ gather_plan_statistics */ apf.ac_nr, apf.ac_na, rev.tm_prd, rev.ac_rev
from test_taccrev rev,
test_tacprof apf
where apf.ac_nr = rev.ac_nr
and tm_prd = 4;
select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-M
| 1 | PX COORDINATOR | | 1 | | 23412 |00:00:00.79 | 6 | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10001 | 0 | 30442 | 0 |00:00:00.01 | 0 | | | |
|* 3 | HASH JOIN | | 0 | 30442 | 0 |00:00:00.01 | 0 | 2825K| 1131K| |
| 4 | PX BLOCK ITERATOR | | 0 | 30441 | 0 |00:00:00.01 | 0 | | | |
|* 5 | TABLE ACCESS FULL | TEST_TACCREV | 0 | 30441 | 0 |00:00:00.01 | 0 | | |
| 6 | BUFFER SORT | | 0 | | 0 |00:00:00.01 | 0 | 73728 | 73728 | |
| 7 | PX RECEIVE | | 0 | 26050 | 0 |00:00:00.01 | 0 | | | |
| 8 | PX SEND BROADCAST | :TQ10000 | 0 | 26050 | 0 |00:00:00.01 | 0 | | | |
| 9 | PX BLOCK ITERATOR | | 0 | 26050 | 0 |00:00:00.01 | 0 | | | |
|* 10 | TABLE ACCESS FULL| TEST_TACPROF | 0 | 26050 | 0 |00:00:00.01 | 0 | | | |
rollback;
A-rows are zero execpt for final step.I'm sorry for posting following long test case.
But it's the most convenient way to explain something. :-)
Here is my test case, which is quite similar to yours.
Note on the difference between "parallel select" and "parallel dml(insert here)".
(I know that Oracle implemented psc(parallel single cursor) model in 10g, but the details of the implementation is quite in mystery as Jonathan said... )
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
SQL>
SQL> alter system flush shared_pool;
System altered.
SQL>
SQL> alter table t parallel 4;
Table altered.
SQL>
SQL> select /*+ gather_plan_statistics */ count(*) from t t1, t t2
2 where t1.c1 = t2.c1 and rownum <= 1000
3 order by t1.c2;
COUNT(*)
1000
SQL>
SQL> select sql_id from v$sqlarea
where sql_text like 'select /*+ gather_plan_statistics */ count(*) from t t1, t t2%';
SQL_ID
bx61bkyh9ffb6
SQL>
SQL> select * from table(dbms_xplan.display_cursor('&sql_id',null,'allstats last'));
Enter value for sql_id: bx61bkyh9ffb6
PLAN_TABLE_OUTPUT
SQL_ID bx61bkyh9ffb6, child number 0 <-- Cooridnator and slaves shared the cursor
select /*+ gather_plan_statistics */ count(*) from t t1, t t2 where t1.c1 = t2.c
1 and rownum <= 1000 order by t1.c2
Plan hash value: 3015647771
PLAN_TABLE_OUTPUT
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
| 1 | SORT AGGREGATE | | 1 | 1 | 1 |00:00:00.62 | 6 | | | |
|* 2 | COUNT STOPKEY | | 1 | | 1000 |00:00:00.62 | 6 | | | |
| 3 | PX COORDINATOR | | 1 | | 1000 |00:00:00.50 | 6 | | | |
| 4 | PX SEND QC (RANDOM) | :TQ10002 | 0 | 16M| 0 |00:00:00.01 | 0 | | | |
|* 5 | COUNT STOPKEY | | 0 | | 0 |00:00:00.01 | 0 | | | |
|* 6 | HASH JOIN BUFFERED | | 0 | 16M| 0 |00:00:00.01 | 0 | 1285K| 1285K| 717K (0)|
| 7 | PX RECEIVE | | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
| 8 | PX SEND HASH | :TQ10000 | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
| 9 | PX BLOCK ITERATOR | | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
|* 10 | TABLE ACCESS FULL| T | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
| 11 | PX RECEIVE | | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
| 12 | PX SEND HASH | :TQ10001 | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
| 13 | PX BLOCK ITERATOR | | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
|* 14 | TABLE ACCESS FULL| T | 0 | 10000 | 0 |00:00:00.01 | 0 | | | |
38 rows selected.
SQL>
SQL> select sql_id, child_number, executions, px_servers_executions
2 from v$sql where sql_id = '&sql_id';
SQL_ID CHILD_NUMBER EXECUTIONS
PX_SERVERS_EXECUTIONS
bx61bkyh9ffb6 0 1
8
SQL>
SQL> insert /*+ gather_plan_statistics */ into t select * from t;
10000 rows created.
SQL>
SQL> select sql_id from v$sqlarea
where sql_text like 'insert /*+ gather_plan_statistics */ into t select * from t%';
SQL_ID
9dkmu9bdhg5h0
SQL>
SQL> select * from table(dbms_xplan.display_cursor('&sql_id', null, 'allstats last'));
Enter value for sql_id: 9dkmu9bdhg5h0
PLAN_TABLE_OUTPUT
SQL_ID 9dkmu9bdhg5h0, child number 0 <-- Coordinator Cursor
insert /*+ gather_plan_statistics */ into t select * from t
Plan hash value: 3050126167
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
| 1 | PX COORDINATOR | | 1 | | 10000 |00:00:00.20 | 3 |
| 2 | PX SEND QC (RANDOM)| :TQ10000 | 0 | 10000 | 0 |00:00:00.01 | 0 |
| 3 | PX BLOCK ITERATOR | | 0 | 10000 | 0 |00:00:00.01 | 0 |
|* 4 | TABLE ACCESS FULL| T | 0 | 10000 | 0 |00:00:00.01 | 0 |
SQL_ID 9dkmu9bdhg5h0, child number 1 <-- Slave(s)
insert /*+ gather_plan_statistics */ into t select * from t
PLAN_TABLE_OUTPUT
Plan hash value: 3050126167
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
| 1 | PX COORDINATOR | | 0 | | 0 |00:00:00.01 | 0 |
| 2 | PX SEND QC (RANDOM)| :TQ10000 | 0 | 10000 | 0 |00:00:00.01 | 0 |
| 3 | PX BLOCK ITERATOR | | 1 | 10000 | 2628 |00:00:00.20 | 16 |
|* 4 | TABLE ACCESS FULL| T | 4 | 10000 | 2628 |00:00:00.02 | 16 |
SQL>
SQL> select sql_id, child_number, executions, px_servers_executions
2 from v$sql where sql_id = '&sql_id'; <-- 2 child cursors here
SQL_ID CHILD_NUMBER EXECUTIONS
PX_SERVERS_EXECUTIONS
9dkmu9bdhg5h0 0 1
0
9dkmu9bdhg5h0 1 0
4
SQL>
SQL> set serveroutput on
-- check mismatch
SQL> exec print_table('select * from v$sql_shared_cursor where sql_id = ''&sql_id''');
Enter value for sql_id: 9dkmu9bdhg5h0
SQL_ID : 9dkmu9bdhg5h0
ADDRESS : 6AD85A70
CHILD_ADDRESS : 6BA596A8
CHILD_NUMBER : 0
UNBOUND_CURSOR : N
SQL_TYPE_MISMATCH : N
OPTIMIZER_MISMATCH : N
OUTLINE_MISMATCH : N
STATS_ROW_MISMATCH : N
LITERAL_MISMATCH : N
SEC_DEPTH_MISMATCH : N
EXPLAIN_PLAN_CURSOR : N
BUFFERED_DML_MISMATCH : N
PDML_ENV_MISMATCH : N
INST_DRTLD_MISMATCH : N
SLAVE_QC_MISMATCH : N
TYPECHECK_MISMATCH : N
AUTH_CHECK_MISMATCH : N
BIND_MISMATCH : N
DESCRIBE_MISMATCH : N
LANGUAGE_MISMATCH : N
TRANSLATION_MISMATCH : N
ROW_LEVEL_SEC_MISMATCH : N
INSUFF_PRIVS : N
INSUFF_PRIVS_REM : N
REMOTE_TRANS_MISMATCH : N
LOGMINER_SESSION_MISMATCH : N
INCOMP_LTRL_MISMATCH : N
OVERLAP_TIME_MISMATCH : N
SQL_REDIRECT_MISMATCH : N
MV_QUERY_GEN_MISMATCH : N
USER_BIND_PEEK_MISMATCH : N
TYPCHK_DEP_MISMATCH : N
NO_TRIGGER_MISMATCH : N
FLASHBACK_CURSOR : N
ANYDATA_TRANSFORMATION : N
INCOMPLETE_CURSOR : N
TOP_LEVEL_RPI_CURSOR : N
DIFFERENT_LONG_LENGTH : N
LOGICAL_STANDBY_APPLY : N
DIFF_CALL_DURN : N
BIND_UACS_DIFF : N
PLSQL_CMP_SWITCHS_DIFF : N
CURSOR_PARTS_MISMATCH : N
STB_OBJECT_MISMATCH : N
ROW_SHIP_MISMATCH : N
PQ_SLAVE_MISMATCH : N
TOP_LEVEL_DDL_MISMATCH : N
MULTI_PX_MISMATCH : N
BIND_PEEKED_PQ_MISMATCH : N
MV_REWRITE_MISMATCH : N
ROLL_INVALID_MISMATCH : N
OPTIMIZER_MODE_MISMATCH : N
PX_MISMATCH : N
MV_STALEOBJ_MISMATCH : N
FLASHBACK_TABLE_MISMATCH : N
LITREP_COMP_MISMATCH : N
SQL_ID : 9dkmu9bdhg5h0
ADDRESS : 6AD85A70
CHILD_ADDRESS : 6B10AA00
CHILD_NUMBER : 1
UNBOUND_CURSOR : N
SQL_TYPE_MISMATCH : N
OPTIMIZER_MISMATCH : N
OUTLINE_MISMATCH : N
STATS_ROW_MISMATCH : N
LITERAL_MISMATCH : N
SEC_DEPTH_MISMATCH : N
EXPLAIN_PLAN_CURSOR : N
BUFFERED_DML_MISMATCH : N
PDML_ENV_MISMATCH : N
INST_DRTLD_MISMATCH : N
SLAVE_QC_MISMATCH : N
TYPECHECK_MISMATCH : N
AUTH_CHECK_MISMATCH : N
BIND_MISMATCH : N
DESCRIBE_MISMATCH : N
LANGUAGE_MISMATCH : N
TRANSLATION_MISMATCH : N
ROW_LEVEL_SEC_MISMATCH : N
INSUFF_PRIVS : N
INSUFF_PRIVS_REM : N
REMOTE_TRANS_MISMATCH : N
LOGMINER_SESSION_MISMATCH : N
INCOMP_LTRL_MISMATCH : N
OVERLAP_TIME_MISMATCH : N
SQL_REDIRECT_MISMATCH : N
MV_QUERY_GEN_MISMATCH : N
USER_BIND_PEEK_MISMATCH : N
TYPCHK_DEP_MISMATCH : N
NO_TRIGGER_MISMATCH : N
FLASHBACK_CURSOR : N
ANYDATA_TRANSFORMATION : N
INCOMPLETE_CURSOR : N
TOP_LEVEL_RPI_CURSOR : N
DIFFERENT_LONG_LENGTH : N
LOGICAL_STANDBY_APPLY : N
DIFF_CALL_DURN : Y <-- Mismatch here. diff_call_durn
BIND_UACS_DIFF : N
PLSQL_CMP_SWITCHS_DIFF : N
CURSOR_PARTS_MISMATCH : N
STB_OBJECT_MISMATCH : N
ROW_SHIP_MISMATCH : N
PQ_SLAVE_MISMATCH : N
TOP_LEVEL_DDL_MISMATCH : N
MULTI_PX_MISMATCH : N
BIND_PEEKED_PQ_MISMATCH : N
MV_REWRITE_MISMATCH : N
ROLL_INVALID_MISMATCH : N
OPTIMIZER_MODE_MISMATCH : N
PX_MISMATCH : N
MV_STALEOBJ_MISMATCH : N
FLASHBACK_TABLE_MISMATCH : N
LITREP_COMP_MISMATCH : N
PL/SQL procedure successfully completed. -
I am finding this bug 11930680 is affecting my APEX 4.1.1 install.. I am Running 11.2.0.1 on Redhat linux
eg
I get 21 versions of this SQL in APEX_040100 in v$sql_shared_cursor, with reasons AUTH_CHECK_MISMATCH LANGUAGE_MISMATCH
SELECT SHORTCUT_NAME, ID
FROM WWV_FLOW_SHORTCUTS
WHERE FLOW_ID = :B3 AND (BUILD_OPTION IS NULL OR (BUILD_OPTION > 0 AND (:B2 IS NULL OR INSTR(:B2 ,':'||BUILD_OPTION||':') = 0) ) OR (BUILD_OPTION < 0 AND (:B1 IS NOT NULL AND INSTR(:B1 ,':'||(0-BUILD_OPTION)||':') = 0) ) )
ORDER BY SHORTCUT_NAMEAny many, many other APEX_040100 SQLs having same issue, which I think is slowing down APEX
Should I
- Grant MERGE ANY VIEW to SYS (as per http://magnusjohanssontuning.wordpress.com/2012/08/01/cursor-not-shared-for-different-users/)
- set optimizer_secure_view_merging=false (as per oracle Workaround)
Anyone have similar problems?
This is My SQL to find problem SQLs.. try it on your apex system
select version_count,address,hash_value,parsing_schema_name,reason,sql_text from (
select
address,''
||decode(max( UNBOUND_CURSOR),'Y', ' UNBOUND_CURSOR')
||decode(max( SQL_TYPE_MISMATCH),'Y', ' SQL_TYPE_MISMATCH')
||decode(max( OPTIMIZER_MISMATCH),'Y', ' OPTIMIZER_MISMATCH')
||decode(max( OUTLINE_MISMATCH),'Y', ' OUTLINE_MISMATCH')
||decode(max( STATS_ROW_MISMATCH),'Y', ' STATS_ROW_MISMATCH')
||decode(max( LITERAL_MISMATCH),'Y', ' LITERAL_MISMATCH')
||decode(max( EXPLAIN_PLAN_CURSOR),'Y', ' EXPLAIN_PLAN_CURSOR')
||decode(max( BUFFERED_DML_MISMATCH),'Y', ' BUFFERED_DML_MISMATCH')
||decode(max( PDML_ENV_MISMATCH),'Y', ' PDML_ENV_MISMATCH')
||decode(max( INST_DRTLD_MISMATCH),'Y', ' INST_DRTLD_MISMATCH')
||decode(max( SLAVE_QC_MISMATCH),'Y', ' SLAVE_QC_MISMATCH')
||decode(max( TYPECHECK_MISMATCH),'Y', ' TYPECHECK_MISMATCH')
||decode(max( AUTH_CHECK_MISMATCH),'Y', ' AUTH_CHECK_MISMATCH')
||decode(max( BIND_MISMATCH),'Y', ' BIND_MISMATCH')
||decode(max( DESCRIBE_MISMATCH),'Y', ' DESCRIBE_MISMATCH')
||decode(max( LANGUAGE_MISMATCH),'Y', ' LANGUAGE_MISMATCH')
||decode(max( TRANSLATION_MISMATCH),'Y', ' TRANSLATION_MISMATCH')
||decode(max( INSUFF_PRIVS),'Y', ' INSUFF_PRIVS')
||decode(max( INSUFF_PRIVS_REM),'Y', ' INSUFF_PRIVS_REM')
||decode(max( REMOTE_TRANS_MISMATCH),'Y', ' REMOTE_TRANS_MISMATCH')
||decode(max( LOGMINER_SESSION_MISMATCH),'Y', ' LOGMINER_SESSION_MISMATCH')
||decode(max( INCOMP_LTRL_MISMATCH),'Y', ' INCOMP_LTRL_MISMATCH')
||decode(max( OVERLAP_TIME_MISMATCH),'Y', ' OVERLAP_TIME_MISMATCH')
||decode(max( MV_QUERY_GEN_MISMATCH),'Y', ' MV_QUERY_GEN_MISMATCH')
||decode(max( USER_BIND_PEEK_MISMATCH),'Y', ' USER_BIND_PEEK_MISMATCH')
||decode(max( TYPCHK_DEP_MISMATCH),'Y', ' TYPCHK_DEP_MISMATCH')
||decode(max( NO_TRIGGER_MISMATCH),'Y', ' NO_TRIGGER_MISMATCH')
||decode(max( FLASHBACK_CURSOR),'Y', ' FLASHBACK_CURSOR')
||decode(max( ANYDATA_TRANSFORMATION),'Y', ' ANYDATA_TRANSFORMATION')
||decode(max( TOP_LEVEL_RPI_CURSOR),'Y', ' TOP_LEVEL_RPI_CURSOR')
||decode(max( DIFFERENT_LONG_LENGTH),'Y', ' DIFFERENT_LONG_LENGTH')
||decode(max( LOGICAL_STANDBY_APPLY),'Y', ' LOGICAL_STANDBY_APPLY')
||decode(max( DIFF_CALL_DURN),'Y', ' DIFF_CALL_DURN')
||decode(max( BIND_UACS_DIFF),'Y', ' BIND_UACS_DIFF')
||decode(max( PLSQL_CMP_SWITCHS_DIFF),'Y', ' PLSQL_CMP_SWITCHS_DIFF')
||decode(max( CURSOR_PARTS_MISMATCH),'Y', ' CURSOR_PARTS_MISMATCH')
||decode(max( STB_OBJECT_MISMATCH),'Y', ' STB_OBJECT_MISMATCH')
||decode(max( PQ_SLAVE_MISMATCH),'Y', ' PQ_SLAVE_MISMATCH')
||decode(max( TOP_LEVEL_DDL_MISMATCH),'Y', ' TOP_LEVEL_DDL_MISMATCH')
||decode(max( MULTI_PX_MISMATCH),'Y', ' MULTI_PX_MISMATCH')
||decode(max( BIND_PEEKED_PQ_MISMATCH),'Y', ' BIND_PEEKED_PQ_MISMATCH')
||decode(max( MV_REWRITE_MISMATCH),'Y', ' MV_REWRITE_MISMATCH')
||decode(max( ROLL_INVALID_MISMATCH),'Y', ' ROLL_INVALID_MISMATCH')
||decode(max( OPTIMIZER_MODE_MISMATCH),'Y', ' OPTIMIZER_MODE_MISMATCH')
||decode(max( PX_MISMATCH),'Y', ' PX_MISMATCH')
||decode(max( MV_STALEOBJ_MISMATCH),'Y', ' MV_STALEOBJ_MISMATCH')
||decode(max( FLASHBACK_TABLE_MISMATCH),'Y', ' FLASHBACK_TABLE_MISMATCH')
||decode(max( LITREP_COMP_MISMATCH),'Y', ' LITREP_COMP_MISMATCH')
reason
from
v$sql_shared_cursor
group by
address
) join v$sqlarea using(address) where version_count>2
and parsing_schema_name like 'APEX_0%'
order by version_count desc,address;Hi,
are you sure that you are calling f from schema apex_040100 and not from the previous version? As a test, can you prefix your call with apex_040100.f
If you check your error/access logs of Apache and mod_plsql, do you see any errors?
Regards
Patrick
My Blog: http://www.inside-oracle-apex.com
APEX Plug-Ins: http://apex.oracle.com/plugins
Twitter: http://www.twitter.com/patrickwolf -
Cursor_sharing改成force,会引起什么bug吗?
公司的数据库内有一套老的应用，跑了好多年了，但没有绑定变量，导致SQLAREA占用大量资源
我想将cursor_sharing改成force，会不会引起bug
我在此之前将此参数similar ，应用会报错
数据库版 10.2.0.4 64bit
SELECT substr(sql_text, 1, 40) "SQL", count(*), sum(executions) "TotExecs"
FROM v$sqlarea
WHERE executions < 5
GROUP BY substr(sql_text, 1, 40) HAVING count(*) > 30 ORDER BY 2 desc;
结果为
1 SELECT ………… 22625 23047
2 insert ………… 21437 21437
3 insert ………… 21429 21429
4 select ………… 19464 22630
5 delete ………… 18655 18655
6 INSERT ………… 18078 20520
7 SELECT ………… 13218 15798
8 INSERT ………… 9060 9060
9 INSERT ………… 9060 9060
10 select ………… 7870 8451
11 insert ………… 7837 8350
12 select ………… 7790 7790
13 select ………… 7789 7789
14 insert ………… 7768 7937
15 SELECT ………… 7716 9052
16 insert ………… 6636 6643
17 SELECT ………… 6392 6392
18 UPDATE ………… 6077 6439
19 SELECT ………… 6027 6389
20 update ………… 4414 4414
21 INSERT ………… 4018 40161. 不推荐在任何版本上继续使用 CURSOR_SHARING=SIMILAR
2. cursor_sharing=force 在某些特性条件下会触发bug， 主要是在低版本(9iR2,10gR2早期)，具体是否触发bug取决于SQL的写法。
建议你直接参考以下 10.2.0.4上cursor_sharing的 bug list:
NB Bug Fixed Description
12862170 12.1.0.0 INSERT ALL fails with ORA-600[kkslhsh1] with CURSOR_SHARING enabled / High Version Count on HASH_MATCH_FAILED
12374212 11.2.0.3, 12.1.0.0 Assorted dump , internal errors, memory corruptions with cursor_sharing = force
12334286 11.2.0.3, 12.1.0.0 High version counts with CURSOR_SHARING=FORCE (BIND_MISMATCH and INCOMP_LTRL_MISMATCH)
11063191 11.2.0.2.7, 11.2.0.2.BP17, 11.2.0.3.2, 11.2.0.3.BP04, 12.1.0.0 ORA-4031 with hint /*+ CURSOR_SHARING_EXACT */ - excessive "KKSSP^nn" memory
10013170 11.2.0.3, 12.1.0.0 ORA-600 [736] from literal replacement with a "WAIT n" clause
9877964 11.2.0.3, 12.1.0.0 ORA-600 [19003] raised by LIKE :BIND in query
9680430 11.2.0.3, 12.1.0.0 High version count with CURSOR_SHARING = FORCE due to CBO transformation
9411496 11.2.0.2, 12.1.0.0 ORA-979 on GROUP BY query with CURSOR_SHARING set
9362218 11.2.0.2, 12.1.0.0 Literals replaced by binds when CURSOR_SHARING=EXACT
9348402 12.1.0.0 OERI [kks-hash-collision] can occur with CURSOR_SHARING=FORCE|SIMILAR
9223586 11.2.0.2, 12.1.0.0 Problems with variable length NCHAR literals with cursor sharing
9031183 11.2.0.2, 12.1.0.0 ORA-1722 with CURSOR_SHARING=SIMILAR and with NCHAR
8246445 11.2.0.2, 12.1.0.0 Query rewrite not working for multi-MV rewrite with literal replacement
5751866 11.2.0.2 Wrong Results with CASE and CURSOR_SHARING
9767674 10.2.0.5.5 Dump [kkslmtl] using CURSOR_SHARING - superceded
8794693 11.2.0.2 Dump [kkscsmtl] using literal replacement (CURSOR_SHARING)
8453245 11.2.0.1 Many child cursors with CURSOR_SHARING = FORCE
8264642 11.2.0.1 ORA-600 [kkexbindopn0] with CURSOR_SHARING = SIMILAR
7516867 10.2.0.5, 11.1.0.7.1, 11.2.0.1 Intermittent Wrong results from literal replacement with fix for bug 6163785
7272297 10.2.0.4.1, 10.2.0.5, 11.1.0.7, 11.2.0.1 Memory corruption / OERI[17114] / OERI[17125] with literal replacement
6337716 10.2.0.5, 11.1.0.7, 11.2.0.1 Wrong max column size for NULL strings with literal replacement
4071519 10.2.0.5, 11.1.0.7, 11.2.0.1 GROUP BY query with CURSOR_SHARING fails with ORA-1802
3461251 11.1.0.7, 11.2.0.1 V$SQL_SHARED_CURSOR shows all N with CURSOR_SHARING
7296258 10.2.0.5, 11.1.0.7.1 Intermittent Wrong results from literal replacement and remote objects
6163785 10.2.0.5, 11.1.0.7 Intermittent Wrong Results with dblink and cursor_sharing
8202234 Intermittent Wrong Results with dblink and cursor_sharing
4867724 10.2.0.5, 11.1.0.6 Literal replacement limits column names to 30 characters -
Ora-4031 after reducing the max sga
Oracle 10g R2 and Baan 5c on AIX 5.3 L (p550, 3792M , 4 lcpu)
After I reduced the max_sga_size (so to avoid the paging), now I see more ora-4031 (out of shared memory loading library cache object) warnings in the udump trc file, not in alert file. In addition, they appeared in the log.ora.sql of Baan as an error message, so the query requests were hung or stopped.
Reading from other posts and metalink note: 146599.1, it indicated that the system has extensive fragmentation problem. (REQUEST_FAILURES is > 0 and LAST_FAILURE_SIZE is > SHARED_POOL_RESERVED_MIN_ALLOC. )
So I used the tips form AskTom to find the query scripts that may have bind variable problem and I did found some, most of them in 2~4 multiples. However, not all of them gave ora-4031 warning/error, actually only very few.
So what should I do for the best practice of the performance? Correct the problems with the bind variable of all queries or
increase the max SGA again.
All the queries were produced by the Baan´s processes or modules.I got hit this thread while searching some other subjects.
(This is kind of old... but answered for a long time)
I think this is somewhat interesting problem.
Here is one query showing in the query of mulitple copies in system by using asktom technique. The system return 3 copies.
SELECT /*+ FIRST_ROWS INDEX(A TTSSOC@$IDX@) */ A.T$CLST FROM >BAANDB.TTSSOC@ A WHERE (A.T$CLST = :@ OR A.T$CLST = :@) AND A.T$ORNO = :@I think there is a chance that you're hitting bind mismatch problem.
Is [email protected]$CLST(What an annoying names~) column is VARCHAR2 type? If yes, following thread will be helpful.
Re: Is there any way to avoid hard parsing caused by "BIND_MISMATCH" in 10g -
"latch: row cache objects" and high "VERSION_COUNT"
Hello,
we are being faced with a situation where the database spends most of it's time waiting for latches in the shared pool (as seen in the AWR report).
All statements issued by the application are using bind variables, but what we can see in V$SQL is that even though the statements are using bind variables some of them have a relatively high version_count (> 300) and many invaliadations (100 - 200) even though the tables involved are very small (some not more than 3 or 4 rows).
Here is some (hopefully enough) information about the environment
Version: Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production (on RedHat EL 5)
Parameters:
cursor_bind_capture_destination memory+disk
cursor_sharing EXACT
cursor_space_for_time FALSE
filesystemio_options none
hi_shared_memory_address 0
memory_max_target 12288M
memory_target 12288M
object_cache_optimal_size 102400
open_cursors 300
optimizer_capture_sql_plan_baselines FALSE
optimizer_dynamic_sampling 2
optimizer_features_enable 11.2.0.2
optimizer_index_caching 0
optimizer_index_cost_adj 100
optimizer_mode ALL_ROWS
optimizer_secure_view_merging TRUE
optimizer_use_invisible_indexes FALSE
optimizer_use_pending_statistics FALSE
optimizer_use_sql_plan_baselines TRUE
plsql_optimize_level 2
session_cached_cursors 50
shared_memory_address 0The shared pool size (according to AWR) is 4,832M
The buffer cache is 3,008M
Now, my question: is a version_count of > 300 a problem (we have about 10-15 of those with a total of ~7000 statements in v$sqlarea). Those are also the statements listed in the AWR report at the top in the section "SQL ordered by Version Count" and "SQL ordered by Sharable Memory"
Is it possible that those statements are causing the the latch contention in the shared pool?
I went through https://blogs.oracle.com/optimizer/entry/why_are_there_more_cursors_in_11g_for_my_query_containing_bind_variables_1
The tables involved are fairly small and all the execution plans for each cursor are identical.
I can understand some of the invalidations that happen, because we have 7 schemas that have identical tables, but from my understanding that shouldn't cause such a high invalidation number. Or am I mistaken?
I'm not that experienced with Oracle tuning at that level, so I would appreciate any pointer on how I can find out where exactly the latch problem occurs
After flushing the shared pool, the problem seems to go away for a while. But apparently that is only fighting symptoms, not fixing the root cause of the problem.
Some of the statements in question:
SELECT * FROM QRTZ_SIMPLE_TRIGGERS WHERE TRIGGER_NAME = :1 AND TRIGGER_GROUP = :2
UPDATE QRTZ_TRIGGERS SET TRIGGER_STATE = :1 WHERE TRIGGER_NAME = :2 AND TRIGGER_GROUP = :3 AND TRIGGER_STATE = :4
UPDATE QRTZ_TRIGGERS SET TRIGGER_STATE = :1 WHERE JOB_NAME = :2 AND JOB_GROUP = :3 AND TRIGGER_STATE = :4
SELECT TRIGGER_STATE FROM QRTZ_TRIGGERS WHERE TRIGGER_NAME = :1 AND TRIGGER_GROUP = :2
UPDATE QRTZ_SIMPLE_TRIGGERS SET REPEAT_COUNT = :1, REPEAT_INTERVAL = :2, TIMES_TRIGGERED = :3 WHERE TRIGGER_NAME = :4 AND TRIGGER_GROUP = :5
DELETE FROM QRTZ_TRIGGER_LISTENERS WHERE TRIGGER_NAME = :1 AND TRIGGER_GROUP = :2So all of them are using bind variables.
I have seen that the columns used in the where clause all have histograms available. Would removing them reduce the number of invalidations?
Unfortunately I did not save the information from v$sql_shared_cursor before the shared pool was flushed, but most of the invalidations occurred in the ROLL_INVALID_MISMATCH column if that is of any help. There are some invalidations reported for AUTH_CHECK_MISMATCH and TRANSLATION_MISMATCH but to my understanding they caused by executing the statement for different schemas if I'm not mistaken.
Looking at v$latch_missed, most of the waits for parent = 'row cache objects' are for "kqrpre: find obj" and "kqreqd: reget">
In the AWR report, what does the Dictionary Cache Stats section say?
>
Here they are:
Dictionary Cache Stats
Cache Get Requests Pct Miss Scan Reqs Mod Reqs Final Usage
dc_awr_control 65 0.00 0 2 1
dc_constraints 729 33.33 0 729 1
dc_global_oids 60 23.33 0 0 31
dc_histogram_data 7,397 10.53 0 0 2,514
dc_histogram_defs 21,797 9.83 0 0 5,239
dc_object_grants 4 25.00 0 0 12
dc_objects 27,683 2.29 0 223 2,581
dc_profiles 1,842 0.00 0 0 1
dc_rollback_segments 1,634 0.00 0 0 39
dc_segments 7,335 6.94 0 360 1,679
dc_sequences 139 5.76 0 139 19
dc_table_scns 53 100.00 0 0 0
dc_tablespace_quotas 1,956 0.10 0 0 4
dc_tablespaces 17,488 0.00 0 0 11
dc_users 58,013 0.03 0 0 164
global database name 4,261 0.00 0 0 1
outstanding_alerts 54 0.00 0 0 9
sch_lj_oids 4 0.00 0 0 2
Library Cache Activity
Namespace Get Requests Pct Miss Pin Requests Pct Miss Reloads Invalidations
ACCOUNT_STATUS 3,664 0.03 0 0 0
BODY 560 2.14 2,343 0.60 0 0
CLUSTER 52 0.00 52 0.00 0 0
DBLINK 3,668 0.00 0 0 0
EDITION 1,857 0.00 3,697 0.00 0 0
INDEX 99 19.19 99 19.19 0 0
OBJECT ID 68 100.00 0 0 0
SCHEMA 2,646 0.00 0 0 0
SQL AREA 32,996 2.26 1,142,497 0.21 189 226
SQL AREA BUILD 848 62.15 0 0 0
SQL AREA STATS 860 82.09 860 82.09 0 0
TABLE/PROCEDURE 17,713 2.62 26,112 4.88 61 0
TRIGGER 1,704 2.00 6,737 0.52 1 0 -
Huge version_count for cursor sharing for store method
Hi,
I'm using Oracle BPM 10.3.2, which is connected to database (11.2.0.3.0).
For quite huge table with 250 columns and 10 000 rows we are using buil-in load and store method, which is available for BPMObject, which is created for database table.
Build-in store method is updating always whole database object, no matter if any field was changed and all variables are bind so shared cursor are used.
Unfortunately even if all updates are similar, database is creating new child because of "bind mismatch" of the variable.
Bind mismatch is because, variable content is different and i.e. varchar2 can have 3 length 32, 128 and 2000 characters.
If database find new combination of variable length to update, new version or cursor is created.
Can I anyway force to use the same cursor for all updates (I've tried cursor_sharing parameter in sys.v_$parameter, but it doesn't work)?
Any other ideas?
BR,
WujekIt might be that your shared pool is fragmented especially if your application is using literals and not using bind variables. High number of version count does not always mean a terrible thing, but most likely it is. You may also have bind_mismatch (the most common reason) that is causing your high version count of SQLs. Read about bind_mismatch and see if this could be the reason in your application. I suggest to execute the command 'alter system flush shared pool;' during idle time (at night when there is no activity) every day to clean up the SQLs that are considered a candidate to be flushed out of the shared pool. I am suggesting this because your application might using literals. REMEMBER, this is NOT a fix. It is just kind of Aspirin until you fix the real problem in your application. You may benchmark and see how it will perform. My last suggestion which is the most important, please think about upgrading your database. This version of Oracle is an old one and Oracle itself is not well supporting it.
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