Database Performance Degraded When Migrated From 10g To 11g R2
Jan 19, 2013
We have just migrated our database from 10g to 11g R2. We are using a PLSQL block to gather stats (analyze) which was executing successfully on 10g but giving below error on 11g:
PLSQL
BEGIN
/* Delete statistics */
DBMS_STATS.DELETE_TABLE_STATS( ownname => 'owner_name', tabname=> 'table_name');
/* Gather statistics */
DBMS_STATS.GATHER_TABLE_STATS( OWNNAME => 'owner_name', TABNAME=> 'table_name' ,METHOD_OPT=>'FOR ALL INDEXED COLUMNS', ESTIMATE_PERCENT => DBMS_STATS.AUTO_SAMPLE_SIZE, DEGREE => DBMS_STATS.DEFAULT_DEGREE, CASCADE => TRUE, NO_INVALIDATE => TRUE);
Error report:
ORA-12801: error signaled in parallel query server P057, instance<instance_name> (2)
ORA-12853: insufficient memory for PX buffers: current 958640K, max needed 11666304K
ORA-04031: unable to allocate 65560 bytes of shared memory ("large pool","unknown object","large pool","PX msg pool")
ORA-06512: at "SYS.DBMS_STATS", line 23828
ORA-06512: at "SYS.DBMS_STATS", line 23879
ORA-06512: at line 5
12801. 00000 - "error signaled in parallel query server %s"
*Cause: A parallel query server reached an exception condition.
*Action: Check the following error message for the cause, and consult your error manual for the appropriate action.
*Comment: This error can be turned off with event 10397, in which case the server's actual error is signaled instead.
This block is working successfully when the degree was hardcoded as 8 in 11g. This block is giving error for only 2 partition tables which has 2 million records. Only difference in both the database parameter is CPU COUNT.
10g CPU count = 16 integer
11g CPU count =48 integer (RAC)
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Feb 22, 2013
Previously we had 32 bit C++. Now, we have migrated it to 64 bit. And our C++ programs interact with Oracle 10g DB.Our C++ program was working fine with 32 bit. But once after we migrate to 64 bit we are facing problem with one program which does FETCH(EXEC SQL FETCH SUBP1 INTO :new TabRec;) from Oracle DB. ie, We exit from a for loop in the C++ program when we get NOT FOUND(sqlca.sqlcode=1403) on executing the FETCH statement.
The sqlcode generated for NOT FOUND scenario is 1403. But, once after moving to 64 bit C++, we do not see the sqlcode 1403 instead we are seeing a different code 7124089117159473.
As the sqlcode is not 1403, our program does not exit from the for loop and goes on an infinite loop.Am I missing anything that makes me to not get the exact sqlcode?
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any possible reason that we'd have to re-install a procedure to correct a performance problem?
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Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class
gc buffer busy 95,077 73,786 776 76.0 Cluster
cursor: pin S wait on X 3,524,808 54,467 15 56.1 Concurrency
library cache lock 30,223 13,660 452 14.1 Concurrency
gc cr request 2,876 3,594 1,250 3.7 Cluster
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CLUSTER 70 0.00 73 0.00 0 0
INDEX 178 0.00 925 0.00 0 0
SQL AREA 423,064 50.25 2,465,209 2.37 182 119,671
TABLE/PROCEDURE 1,848 21.27 22,638 0.62 70 0
TRIGGER 14 0.00 1,801 0.06 1 0
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We've been battling with very slow performance for some time. Herewith a detail description of the problem:
Solaris-11/ZFS/Oracle problem
We purchased Oracle T4-2 servers, and are experiencing some weird performance problems.
Hardware:
T4-2
2 x 600GB HDD per server
128GB memory per server
2 x dual port QLE2562 FO HBAs
IBM V7000 StorWyse data array
2 x CISCO MDS 9148 fibre optic fabric switches
Software:
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MPXIO
Solaris 10 branded local zones
ORACLE 10g Enterprise edition
Project for the oracle user:
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SQL> show parameter sga
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 1152M
sga_target big integer 0
[code]....
in scenario above, the database do not using ASMM, and spfile If I wan to increase db_cache_size parameter, do i need to rebounce instance?
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Query:
SELECT seq,CCN,ProcessorPart,root_item,comp_path,Item,comp_item,comp_item_type,
lag(comp_item_type,1,'PART') over(PARTITION BY seq ORDER BY lvl)Nxt_comp_item_type,lvl,bom_qty,
ROUND(CASE min(abs(bom_qty)) OVER (PARTITION BY seq ORDER BY lvl)
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'AMER'
[code]...
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SORT UNIQUE236360
UNION-ALL
PARTITION LIST SINGLE117240
[code]...
Explain Plan in SIT: COST CARDINALITY BYTES
SELECT STATEMENT, GOAL = ALL_ROWS3211689
SORT UNIQUE347240
UNION-ALL
PARTITION LIST SINGLE172120
[code]...
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@?/rdbms/admin/addmrpt.sql.
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DETAILED ADDM REPORT FOR TASK 'TASK_64718' WITH ID 64718
Analysis Period: 10-APR-2012 from 06:00:15 to 07:00:22
Database ID/Instance: 324353546/1
Database/Instance Names: JACK/jack1
Host Name: fdsfggwe001
[code].....
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[code]
Variable sga = java pool + large pool + shared pool
select pool,name,sum(bytes)
from v$sgastat
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Here variable size using v$sga : 211337216 bytes
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[/code]
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Begin
-- create the pending area
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END;
/
BEGIN
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[code]....
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