Ora-12801 Error Signaled In Parallel Query Server P004 Instance
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Ora-12801 Error Signaled In Parallel Query Server P000 Instance
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ora-12801 error signaled in parallel query server p006 Parallel query error ORA-12801 Oracle Database Tips by Burleson Consulting Question: When running Oracle parallelOra-12801 Error Signaled In Parallel Query Server P010
query, I get a sporadic error like this: ERROR: ORACLE execute error: ORA-12801: error signaled in parallel query server P017 ORA-01652: unable to extend temp segment by 314 in http://searchoracle.techtarget.com/answer/ORA-12801-error-signaled-in-parallel-query-server-P004 tablespace TEMP. I understand the ORA-01652 as being caused by running out of space, but I do not understand the ORA-12801. Answer: Wow, P017, that's a lot of parallel query processes. Just make sure that you have enough processors to support this load. I've seen this ORA-12801 error pop-up intermittently for no apparent reason, usually when the server is especially active, http://www.dba-oracle.com/t_ora_12801_parallel_query.htm and it's always the second message (in your case, ORA-01652). MOSC note 184416.1 has details on diagnosing the ORA-12801 error. It notes that the ORA-12801 is somewhat generic and that you should look for more details in your alert.log or in trace files in the USER_DUMP_DEST or BACKGROUND_DUMP_DEST location. You can set event 10397 to get more details: ORA-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. In any case, the central question is why your parallel query was performing a sort, resulting in the ORA-01652 error? OPQ generally sorts as the final step, after the paralel processes have returned the result set to the parallel query coordinator (usually P00).The symptom solution, of course, is to increase the size of your TEMP tablespace, or better still, increase your sort_area_size. If this job is running batch, y
3:46 pm UTC Category: Database � Version: 8.1.7 Whilst you are here, check out some content from the AskTom team: On Uniqueness, Space, and Numbers https://asktom.oracle.com/pls/asktom/f%3Fp%3D100:11:0::::P11_QUESTION_ID:1027523970333 Latest Followup You Asked Tom, Suppose I have enabled parallel query on one of the tables out of 50 in my application..Then if I query using a join between https://myoraclehome.wordpress.com/2010/07/28/oracle-parallel-query/ those tables (only one of them is parallel query enabled ) then would Oracle still use the parallel query when running that query. If not, is there something like error signaled a hint to make Oracle use the parallel query against that table. eg...EMP table with 1 million rows and parallel query enabled. DEPT with 1000 rows and parallel query NOT enabled. Then the following query will it use the parallel query on EMP table. Select * from EMP, DEPT WHERE emp.deptno = dept.deptno; Thanks, Suresh and we said... Any error signaled in operation that could be parallelized against that table in any query would be a condidate for parallelization (against that table) You can always add the parallel hint to the query. As for your question -- it might, it might not. Depends on what table is driving the query. If we full scan DEPT and index access EMP, no -- most likely a serial operation. If we full scan EMP and index access DEPT -- probably. If we full scan both, probably. Easy enough to see what'll happen (dbms_stats is great for this "what if" stuff) ops$tkyte@ORA817.US.ORACLE.COM> create table emp as select * from scott.emp where 1=0; Table created. ops$tkyte@ORA817.US.ORACLE.COM> create table dept as select * from scott.dept where 1=0; Table created. ops$tkyte@ORA817.US.ORACLE.COM> ops$tkyte@ORA817.US.ORACLE.COM> alter table dept add constraint dept_pk primary key(deptno); Table altered. ops$tkyte@ORA817.US.ORACLE.COM> alter table emp add constraint emp_fk foreign key(deptno) references dept; Table altered. ops$tkyte@ORA817.US.ORACLE.COM> create index emp_fk_idx on emp(deptno); Index created. ops$tkyte@ORA817.US.ORACLE.COM> ops$tkyte@ORA817.US.ORACLE.COM> ops$tkyte@ORA817.US.ORACLE.COM> exec dbms_stats.set_table_stats( USER, 'EMP', numrows => 1000000, numblks => 100000, avgrlen=> 700 ) PL/SQL procedure successfully completed. ops$tkyt
Filed under: Oracle Core — Leave a comment July 28, 2010 Parallel Query Is Oracle's way of scaling database performance. It uses the CPUs to define up how many parallel requests can be made. When the tables and indexes are defined using PARALLEL = DEFAULT, they pick up the default degree of parallelism for the instance, which should be (processors) x 2 (parallel threads per CPU). So for example, consider a table with 10 rows is partitioned into 5 parts. When we run a query for a full table scan, then the database, can use the parallel query concept can spawn up to 5 different processed to gather the required information for the query. These separate results are then passed to a parallel query coordinator which the consolidates the results and publishes the output
Usually errors associated with parallel query are something like this. ERROR ORA-01652: unable to extend temp segment by 512 in tablespace ERROR at line 1: ORA-12801: error signaled in parallel query server P005 In the database the parallel query parameter is controlled by the initialization parameter parallel_max_servers. SQL> conn sys/password@orcl as sysdba Connected. SQL> alter system set parallel_max_servers = 24 scope=memory; System altered. We can Query V$PX_PROCESS to see how many slaves are running. SQL> SELECT * FROM v$px_process; SERV STATUS PID SPID SID SERIAL# --- ------ ------- -------- ------- ------- P023 IN USE 52 11852 318 441 P012 IN USE 38 11830 327 7723 P000 IN USE 24 10078 348 2064 P004 IN USE 29 10086 357 1433 . . The errors ORA-12805 and ORA-12801 returned from a parallel query don't give the root cause of the problem, they just indicate that we have had some other problem in processing the query in parallel. These messages are usually accompanied by additional messages which indicate the real problem. These additional messages may be displayed on the screen or in the alert.log or in trace files in the USER_DUMP_DEST or BACKGROUND_DUMP_DEST location. Like this:Like Loading... Related Comments RSS feed Leave a Reply Cancel reply Enter your comment here... Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using you