Error Signaled In Parallel Query Server
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Client Opportunities Support Solutions Training Legacy to Oracle WebCenter Oracle Documents Cloud Service Next Generation AP Automation & error signaled in parallel query server p008 Dynamic Discounting Oracle WebCenter Contract Lifecycle Management (CLM) Search ORA-12801: error signaled in parallel query serverYou are here: Home / Resources / ORA-12801: error signaled in parallel query server error signaled in parallel query server p002 ORA-12801 One of the greatest achievements of Oracle database software is its ability to process massive sums of information into a multitude of tables and functions. The downside is that in any system, dealing with huge amounts of data can naturally carry some headaches and frustration along the way. The ORA-12801 would most easily fall into this category,
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an Oracle error emanating most often in response to errors when processing large jobs. The Problem The ORA-12801 is an Oracle error that has some confusing origins, but is described as an error resulting in some form from a parallel query server. The error frequently accompanies another error, often the ORA-01652 (which concerns an inability to extend the temp segment in a tablespace). The ORA-12801 is essentially a general error, a sort of catchall for parallel query issues. At this juncture, some of you may be wondering yourselves, “What is a parallel query?” First showing up in later versions of Oracle7, a parallel query option lets multiple processes request and receive data and perform operations at the same time. As you would imagine, this can greatly enhance the speed of the system. To achieve this kind of efficiency, there are several conditions for the parallel query that require attention. So what are those conditions and how do they pertain to resolving an ORA-12801 error? The Solution An absolutely crucial element in successful
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x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up https://www.tekstream.com/resources/ora-12801-error-signaled-in-parallel-server/ ORA-12801: error signaled in parallel query server P004 and ORA-01555: snapshot too old up vote 0 down vote favorite I am executing a insert into ... select ... from ... where ... SQL and got following error using Oracle: java.sql.SQLException: ORA-12801: error signaled in parallel query server P004 ORA-01555: snapshot too old: rollback segment number 32 with name "_SYSSMU32_2039035886$" too small I read the http://stackoverflow.com/questions/29579352/ora-12801-error-signaled-in-parallel-query-server-p004-and-ora-01555-snapshot following doc: http://www.dba-oracle.com/t_ora_12801_parallel_query.htm and http://www.dba-oracle.com/t_ora_01555_snapshot_old.htm Saying ORA-12801 is caused by no enough processors to support parallel query. ORA-01555 error relates to insufficient undo storage or a too small value for the undo_retention parameter. But how can I check related parameters to avoid such issue recur? sql oracle oracle11g oracle10g share|improve this question asked Apr 11 '15 at 15:04 coderz 1,57641333 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote accepted From the manual: ORA-12801: error signaled in parallel query server string 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. This is a generic error message and almost never has anything to do with not enough processors. This is an example of how the site you linked to often contains lots bad or outdated information. Maybe 17 processes was "a lot" 17 years ago, but it's not today. Unfortunately, that site is often the first result from Google. You can check the UNDO retention, which is the amount of time in seconds, like this: s
3:46 pm UTC Category: Database – Version: 8.1.7 Latest Followup You Asked Tom, Suppose I have enabled parallel query on one https://asktom.oracle.com/pls/asktom/f%3Fp%3D100:11:0::::P11_QUESTION_ID:1027523970333 of the tables out of 50 in my application..Then if I query using a join between 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 a hint to make Oracle use the parallel query against that error signaled 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 operation that could be parallelized against that error signaled in 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 proc