Parallel query hint with stored outlines

Hi,
Can I use parallel query hint with stored outlines.
Regards
MMU

I'm not quite sure what you're asking, since stored outlines themselves implement hints to try to maintain plan stability.
If you're asking if stored outlines will utililze the parallel query hints I'd have to assume "yes" but would test the idea anyway.
Message was edited by:
riedelme

Similar Messages

Stored outlines hints in diff query...

hello all,
I am on 10.2.0.3 i had a question on stored outline....i create the below stored outline in our dummy env....but my question is how can i use the hints used by stored outline in my query that i was use in my other env ....just use all the hints from this stroed outlines in other env...
CREATE OUTLINE emp_dept FOR CATEGORY scott_outlines
ON SELECT e.empno, e.ename, d.dname FROM emp e, dept d WHERE e.deptno = d.deptno;
-- Check the outline as been created correctly.
COLUMN name FORMAT A30
SELECT name, category, sql_text FROM user_outlines WHERE category = 'SCOTT_OUTLINES';
NAME                           CATEGORY
SQL_TEXT
EMP_DEPT                       SCOTT_OUTLINES
SELECT e.empno, e.ename, d.dname FROM emp e, dept d WHERE e.deptno = d.deptno
1 row selected.
-- List the hints associated with the outline.
COLUMN hint FORMAT A50
SELECT node, stage, join_pos, hint FROM user_outline_hints WHERE name = 'EMP_DEPT';
      NODE      STAGE   JOIN_POS HINT
         1          1          0 NO_EXPAND(@"SEL$1" )
         1          1          0 PQ_DISTRIBUTE(@"SEL$1" "E"@"SEL$1" NONE NONE)
         1          1          0 USE_MERGE(@"SEL$1" "E"@"SEL$1")
         1          1          0 LEADING(@"SEL$1" "D"@"SEL$1" "E"@"SEL$1")
         1          1          0 NO_STAR_TRANSFORMATION(@"SEL$1" )
         1          1          0 NO_FACT(@"SEL$1" "E"@"SEL$1")
         1          1          0 NO_FACT(@"SEL$1" "D"@"SEL$1")
         1          1          2 FULL(@"SEL$1" "E"@"SEL$1")
         1          1          1 INDEX(@"SEL$1" "D"@"SEL$1" ("DEPT"."DEPTNO"))
         1          1          0 NO_REWRITE(@"SEL$1" )
         1          1          0 NO_REWRITE(@"SEL$1" )
11 rows selected.so how would i use the 11 hints that i got from this hint...in my other DB....so now in my other DB i was a query like
SELECT /* hints hints hints */ e.empno, e.ename, d.dname FROM emp e, dept d WHERE e.deptno = d.deptno;
where hints are below ...
NO_EXPAND(@"SEL$1" )
PQ_DISTRIBUTE(@"SEL$1" "E"@"SEL$1" NONE NONE)
USE_MERGE(@"SEL$1" "E"@"SEL$1")
LEADING(@"SEL$1" "D"@"SEL$1" "E"@"SEL$1")
NO_STAR_TRANSFORMATION(@"SEL$1" )
NO_FACT(@"SEL$1" "E"@"SEL$1")
NO_FACT(@"SEL$1" "D"@"SEL$1")
FULL(@"SEL$1" "E"@"SEL$1")
INDEX(@"SEL$1" "D"@"SEL$1" ("DEPT"."DEPTNO"))
NO_REWRITE(@"SEL$1" )
NO_REWRITE(@"SEL$1" )
is that even do-able if so, how would my new query look like with all the hints ??

yes i understand i need to hand code that into the sql...thats exactly what i want....
how would i use the below hints from stored outline in my query ???
NO_EXPAND(@"SEL$1" )
PQ_DISTRIBUTE(@"SEL$1" "E"@"SEL$1" NONE NONE)
USE_MERGE(@"SEL$1" "E"@"SEL$1")
LEADING(@"SEL$1" "D"@"SEL$1" "E"@"SEL$1")
NO_STAR_TRANSFORMATION(@"SEL$1" )
NO_FACT(@"SEL$1" "E"@"SEL$1")
NO_FACT(@"SEL$1" "D"@"SEL$1")
FULL(@"SEL$1" "E"@"SEL$1")
INDEX(@"SEL$1" "D"@"SEL$1" ("DEPT"."DEPTNO"))
NO_REWRITE(@"SEL$1" )
NO_REWRITE(@"SEL$1" )

Stored outline issue

Hi experts,
i have an issues with stored outlines.i am on oracle 9.2.0.1
i created and outline as
CREATE OR REPLACE OUTLINE JOB1 FOR CATEGORY JOB_TBL2 ON
SELECT EMPLID FROM PS_JOB WHERE ACTION LIKE :1
then
ALTER SESSION SET use_stored_outlines=JOB_TBL2;
after that if i run the query SELECT EMPLID FROM PS_JOB WHERE ACTION LIKE :1 then my stored outline is used
but if i run as SELECT EMPLID FROM PS_JOB WHERE ACTION LIKE 'HIR' it doesnot use stored outline.
i test with both cursor sharing =similar\exact
Please help.

Loading at non lev0 members and aggregating with SET AGGMISSIG OFF may protect the data at non lev0 combinatioons that time.
It will not protect the data permanantly as future calc operations has always a chance to overwrite that data.
Follow the below prctices
1) Load high at the non lev0 combination
2) Run the push down calculation to allocate this data to lev0 combinations.
3) Aggregate the data.
Second approch is
If you dont like to tie this data to the any available lev0 members for any reasons.Consider the below hierarchy
---PG
-------PG1
-------PG2
-------PG3
You want to load data at PG member level and dont like to tie for any of the members PG1, PG2 and PG3.
Then add a place holder member PG_I as a sibling to PG3 and load the data to that PG_I.
Then you can see the expected data at PG with out loading high and applying conditions.

Parallel query feature

Hi to utilize the parallel query option in database in 9i 10 g how can me modify the sql staments or the procedures.Whether it will use the parallel query feature without giving the parallel query hint?
with regards
ramya

When we have to handle a lot of data in operations, like full table scans of large tables, or the creation of large indices, we can divide the work. Instead of using a single process for one statement, the work can be spread to multiple processes. This is called parallel execution or parallel processing. Parallel execution normally reduces response time when you are accessing large amount of data, but it is not always faster than a serial operation.
Parallel execution is useful for many types of operations like:
* Queries requiring large table scans, joins, or partitioned index scans
* Creation of large indices and large tables
* Bulk inserts, updates and deletes
* Aggregations
We have the following hints to influence the use of parallel execution
* PARALLEL
* NOPARALLEL
* PQ_DISTRIBUTE
* PARALLEL_INDEX
* NOPARALLEL_INDEX
From the session where the query run, type:
select * from v$pq_sesstat;
SELECT slave_name,status, cpu_secs_total
FROM v$pq_slave;
Performance summary:
It cannot be stressed strongly enough that parallel query is not always quicker than serial. Some queries are more suited to parallel operations than others. If you are using parallel execution, then you should endeavour to maximize I/O throughput to your disk. Ensure that:
* you have enough slaves to retrieve the data efficiently
* you do not have too many slaves (avoid maxing out the CPU)
* you set realistic memory parameters (sort_area_size etc.) so that you do not max out memory and cause swapping
* the data is spread over multiple disk spindles so that slaves do not contend for I/O resource
* the type of query your are attempting to execute in parallel is suitable for parallelisation.
* watch for non-uniform loading on slave processes as this could indicate data skew.
http://www.jlcomp.demon.co.uk/pqcosts.html
courtesy from oracle metalink.
SJH
OCP DBA

Use Stored Outlines to replace ANALYZE with "do nothing" ?

Has anyone used Stored Outlines to replace statements like "ANALYZE TABLE abc COMPUTE STATISTICS" ?
Say you have an application that issues a number of 'ANALYZE TABLE' statements at different times during a batch run and you want some of the ANALYZE calls to succeed (eg for tables 'stu' and 'xyz') but others to "do nothing" (eg for table 'abc').
Could you replace "ANALYZE TABLE abc COMPUTE STATISTICS" with a (for example) "select 'x' from dual" call ?

Hemant K Chitale wrote:
Has anyone used Stored Outlines to replace statements like "ANALYZE TABLE abc COMPUTE STATISTICS" ?
Say you have an application that issues a number of 'ANALYZE TABLE' statements at different times during a batch run and you want some of the ANALYZE calls to succeed (eg for tables 'stu' and 'xyz') but others to "do nothing" (eg for table 'abc').
Could you replace "ANALYZE TABLE abc COMPUTE STATISTICS" with a (for example) "select 'x' from dual" call ?
If i understood it right, you seem to mean query rewrite.
As you know already, stored outline is a series of hints to guide optimizer to emulate previous plan.
It cannot be used to replace query text itself.
Advanced query rewrite(10g) seems to be promising, but it can only be used for select statement.
Dion Cho
PS) Rewriting query is very powerful, but very dangerous both for performance and security.
That is maybe the reason why Oracle does not provide those kinds of functionality.

Problem with temp space allocation in parallel query

Hello
I've got a query which matches two large result sets (25m+ rows) against each other and does some basic filtering and aggregation. When I run this query in serial it takes about 30 mins and completes successfully. When I specify a parallel degree of 4 for each result set, it also completes successfully in about 20 minutes. However, when I specify that it should be run in parallel but don't specify a degree for each result set, it spawns 10 parallel servers and after a couple of minutes, bombs out from one of the parallel servers with:
ORA-12801: error signaled in parallel query server P000
ORA-01652: unable to extend temp segment by 64 in tablespace TEMPThis appears to be when it is about to perform a large hash join. The execution plan does not change whether the parallel degree is specified or not, and there is several GB of temp space available.
I'm at a bit of a loss as to how to track down specifically what is causing this problem. I've looked at v$sesstat for all of the sessions involved and it hasn't really turned anything up. I've tried tracing the main session and that hasn't really turned up much either. From what I can tell, one of the sessions seems to try to allocate massive amounts of temp space that it just does not need, but I can figure out why.
Any ideas of how to approach finding the cause of the problem?
David

Hello
I've finally resolved this and the resolution was relatively simple - and was also the main thing that Mark Rittman said he did in his article: reduce the size of the hash join.
After querying v$sql_workarea_active I could see what was happening which was that the sum of the temp space for all of the parallel slaves was exceeding the total amount of temp space available on the system. When run in serial, it was virtually at the limit. I guess the extra was just the overhead for each slave maintaining it's own hash table.
I also made the mistake of misreading the exectuion plan - assuming that the data being pushed to the hash join was filtered to eliminate the data that was not of interest. Upon reflection, this was a rather stupid assumption on my part. Anyway, I used sub query factoring with the materialize hint to ensure that the hash join was only working on the data it should have been. This significantly reduced the size of the hash table and therefore the amount of temp space required.
I did speak to oracle support and they suggested using pga_aggregate_target rather than the separate *area_size parameters. I found that this had very little impact as the problem was related to the volume of data rather than whether it was being processed in memory or not. That said, I did try upping the hash_area_size for the session with some initial success, but ultimately it didn't prove to be scalable. We are however now using pga_aggregate_target in prod.
So that's that. Problem sorted. And as the title of Mark Rittman's article suggests, I was trying to be too clever! :-)
HTH
David

ORA-1555 with Parallel query problem

Hi
We are getting many ora-1555 errors with parallel query stuff. Few queries are throwing with hint /* Q98989129 NO_EXPAND INDEX or /* Q908231094 INDEX_RRS. Our applicaiton is like DSS kind with bulk loading and big reports. I have doubled the undo retention and undo size to 200G and set the trace event. But most of the queries are parallel queries. We are not using the following query in applicaiton. seems like it is parallel sub queries. I need to know the exact mechanism how to devide the parallel queries with its degree of parallalism.
SELECT /*+ Q277874009 INDEX_RRS(A1 "PK_TF_UTRAN_UCELL10_TAB") */ A1."TSTAMP" C0,A1."INSTANCE_ID" C1,A1."PMNOFOIRATHOM
ULTIGSMFAILURE" C2,A1."PMNOFOIRATHOCS57GSMFAIL" C3,A1."PMNOFOSPEECHGSMFAILURE" C
4,A1."PMNOFOHOSTANDGSMFAILURE" C5 FROM "FLEXPM"."ERC_TF_UTRAN_UCELL10_TAB" PX_G
RANULE(0, BLOCK_RANGE, DYNAMIC) A1 WHERE A1."TSTAMP"(+)<=TO_DATE('2006-09-25 23:
45:00', 'yyyy-mm-dd hh24:mi:ss')
Thanks

Hi,
probably the error is due to wrong execution plans choosen by the optimizer.
Are the table statistics up to date? Did You use parallel w/o and degree (ex. defining parallel on object using DEFAULT clause instead of a DEGREE)?
Normally, parallel execution can be done in 2 ways, considering the driving object:
1. like in previous versions, like 7.3, w/o partitioning, the object is split, by rowid, directly from the parallel coordinator to the query slaves (normally a number that can be equivalent to the degree of parallelism or the double in case of sort e/o joins).
2. considering a partitioned object, for every partition/subpartition (phisical segment), a query slaves is made in charge.
In both ways, the original session (SID) is the parallel coordinator that coordinates the salves executions.
The hints and statements that You've reported are tipical queries used by slave process.
In my experience, setting the PARALLEL degree to DEFAULT (no degree during CREATE or ALTER of the object after PARALLEL clause) will cause an "explosion" of slaves startup that can conduct to yr errors.
Hope this helps
Max

Query on stored outlines

Hi,
The database version is 10204.
I have a query which is running fine in TEST but not in PRODUCTION.
I have created the outline, however have a doubt.
The difference in the query in TEST and PROD is that the schema in TEST differs from the schema in PROD.
However object names remain the same.
Would the outline still work in PROD?
select * from crmprd.table1 ...........
select * from db3.table1 ......Rgds,
Sanjay

No, that won't work
>
There is a one-to-one correspondence between SQL text and its stored outline. If you specify a different literal in a predicate, then a different outline applies. To avoid this, replace literals in applications with bind variables
>
See Using Plan Stabilility in the Database Performance Tuning Guide.
http://docs.oracle.com/cd/B19306_01/server.102/b14211/outlines.htm
The outline association is based on a hash of the SQL text and the hash won't match. That is why the above excerpt suggests using bind variables; it makes the hash the same even though the actual value of the bind can be different at run time.

Apply process is aborting with:ORA-12801: error signaled in parallel query

hi,
We created a queue of a specific type, capture and apply process on the queue. Then we started the queue capture and the apply process. The problem is that the apply process is getting enabled and with in moments going into aborted state. wea re getting the follwoing error:
ORA-12801: error signaled in parallel query server P000
ORA-00600: internal error code, arguments: [kwqiceval:anyconv], [], [], [], [], [], [], []
Any idea what could have gone wrong?
scripts:
exec dbms_aqadm.create_queue_table(queue_table=>'qt_anc',queue_payload_type=>'type_anc',multiple_consumers=> true, compatible => '9.0');
exec dbms_aqadm.create_queue (queue_name => 'q_anc',queue_table=>'qt_anc');
EXEC DBMS_AQADM.START_QUEUE (queue_name => 'q_anc');
DECLARE
emp_rule_name_dml VARCHAR2(300);
emp_rule_name_ddl VARCHAR2(300);
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_RULES(
table_name => 'ops.t_anc',
streams_type => 'capture',
streams_name => 'capture_anc',
queue_name => 'strmadmin.q_anc',
include_dml => true,
include_ddl => false,
source_database => null,
dml_rule_name => emp_rule_name_dml,
ddl_rule_name => emp_rule_name_ddl);
DBMS_APPLY_ADM.SET_ENQUEUE_DESTINATION(
rule_name => emp_rule_name_dml,
destination_queue_name => 'strmadmin.q_anc');
END;
DECLARE
emp_rule_name_dml VARCHAR2(300);
emp_rule_name_ddl VARCHAR2(300);
BEGIN
DBMS_STREAMS_ADM.ADD_TABLE_RULES(
table_name => 'ops.t_anc',
streams_type => 'apply',
streams_name => 'apply_anc',
queue_name => 'strmadmin.q_anc',
include_dml => true,
include_ddl => false,
source_database => null,
dml_rule_name => emp_rule_name_dml,
ddl_rule_name => emp_rule_name_ddl);
DBMS_APPLY_ADM.SET_ENQUEUE_DESTINATION(
rule_name => emp_rule_name_dml,
destination_queue_name => 'strmadmin.q_anc');
END;
BEGIN
DBMS_APPLY_ADM.START_APPLY(
apply_name => 'apply_anc');
END;
BEGIN
DBMS_CAPTURE_ADM.START_CAPTURE(
capture_name => 'capture_anc');
END;
/

Hello
The above configuration is never supported. The implicit capture expects the queue payload to be SYS.ANYDATA and same with implicit apply also.
However you can use Streams Messaging capability to achieve this. You need to wrap the messages with SYS.ANYDATA for this to work. The implicit capture uses a persistent logminer session to generate LCRs and it then wraps it with SYS.ANYDATA and enqueues into the capture queue, it then propagated to apply queue. You can generate LCRs and wrap it with SYS.ANYDATA and then enqueue into the capture queue then apply can recognise the messages.
Here is an example on creating LCRs (tested in 10g):
CREATE TABLE lcr_test (col1 NUMBER);
DECLARE
     l_lcr SYS.LCR$_ROW_RECORD;
BEGIN
     l_lcr :=
SYS.LCR$_ROW_RECORD.CONSTRUCT
     source_database_name=>SYS_CONTEXT('USERENV','DB_NAME'),
     command_type=>'INSERT',
     object_owner=>USER,
     object_name=>'LCR_TEST'
     l_lcr.ADD_COLUMN('new','col1',SYS.AnyData.ConvertNumber(99));
     l_lcr.EXECUTE(TRUE);
     COMMIT;
END;
SELECT * FROM lcr_test;
Converting to SYS.ANYDATA:
DECLARE
     l_lcr SYS.LCR$_ROW_RECORD;
     l_anydata SYS.ANYDATA;
BEGIN
     l_lcr :=
SYS.LCR$_ROW_RECORD.CONSTRUCT
     source_database_name=>SYS_CONTEXT('USERENV','DB_NAME'),
     command_type=>'INSERT',
     object_owner=>USER,
     object_name=>'LCR_TEST'
     l_lcr.ADD_COLUMN('new','col1',SYS.AnyData.ConvertNumber(99));
     l_anydata:=SYS.ANYDATA.ConvertObject(l_lcr);
     ENQ_PROC(l_anydata);
     COMMIT;
END;
Thanks,
Rijesh

Oracle11g RAC with partitioning and cross instance parallel query problem

I have set up a 300gb TPC-H database using a 4 node RAC environment (8 cpu per node, 16 GB memory, 2 GHz processors) the system is served by 2.5 terabytes of SSD for its IO subsystem managed by a combination of ASM and OCFS2.
When I run a large parallel query (number 9 in the TPCH query set) I get:
ORA-00600: internal error code, arguments [kxfrGraDistNum3],[65535],[4]
with all other arguments blank. There were some reports of this in version 9, but it was supposedly fixed. Has any one seen this behavior or have a work around?
Mike

Good Idea! Why didn't I think of that? Oh yea...I did. Unfortunately TMS CSI is an update only partner type CSI so I cannot submit a SR. The 600 lookup was how I found the old stuff, but it didn't have any 11g references. I hoped maybe someone in the community had encountered this and had a workaround. By the way, the querey looks like so:
select
nation,
o_year,
sum(amount) as sum_profit
from
select
n_name as nation,
extract(year from o_orderdate) as o_year,
l_extendedprice * (1 - l_discount) - ps_supplycost * l_quantity as amount
from
h_part,
h_supplier,
h_lineitem,
h_partsupp,
h_order,
h_nation
where
s_suppkey = l_suppkey
and ps_suppkey = l_suppkey
and ps_partkey = l_partkey
and p_partkey = l_partkey
and o_orderkey = l_orderkey
and s_nationkey = n_nationkey
and p_name like '%spring%'
) as profit
group by
nation,
o_year
order by
nation,
o_year desc;
the other 21 queries, all using the same tables and degrees of paralell and cross instance settings, executed ok.
Mike

Database stopped with Error:ORA-10388: parallel query server interrupt (fai

Hi Team,
My Oracle 10g Database stopped automatically. When i checked the alert log i found the below Errors:
Errors in file /opt/oracle/admin/DWS/bdump/dws_p000_10374.trc:
ORA-10388: parallel query server interrupt (failure)
Fri Mar 2 18:55:18 2012
SMON: Restarting fast_start parallel rollback
Fri Mar 2 18:55:47 2012
Thread 1 advanced to log sequence 384310 (LGWR switch)
Current log# 3 seq# 384310 mem# 0: +DBDG/dws/onlinelog/group_3.259.733426831
Fri Mar 2 18:57:48 2012
Errors in file /opt/oracle/admin/DWS/bdump/dws_p000_10374.trc:
ORA-10388: parallel query server interrupt (failure)
Fri Mar 2 18:57:49 2012
Errors in file /opt/oracle/admin/DWS/bdump/dws_smon_10337.trc:
ORA-00600: internal error code, arguments: [6006], [1], [], [], [], [], [], []
Fri Mar 2 19:18:31 2012
Errors in file /opt/oracle/admin/DWS/bdump/dws_pmon_10277.trc:
ORA-00474: SMON process terminated with error
Fri Mar 2 19:18:31 2012
PMON: terminating instance due to error 474
======================================================================
A week before we stopped oracle using "Shutdown abort" command. But two days before we stopped using "shutdown immediate", it went fine and system up and run fine.
But today it stopped with this error message.
Operating system : SOlaris 10
I changed the parameter parameter fast_start_parallel_rollback to HIGH from LOW, but no use
SQL> ALTER SYSTEM SET FAST_START_PARALLEL_ROLLBACK=HIGH SCOPE=BOTH;
System altered.
SQL> show parameter fast_start_parallel_rollback
NAME TYPE VALUE
fast_start_parallel_rollback string HIGH
Usually The dead transaction will be rolled back after raising the Priority from LOW to HIGH. But this time its not rolled back. still etting the same error.
Your answers will help to stop the oracle getting down in the LIVE production server. please share your experience guys.
Thanks and Regards,
Deeban

Hi,
Here im pasting the Trace file content for the error "ORA-00600: internal error code, arguments: [6006], [1], [], [], [], [], [], []".
[10:20pm] root@dws41: # cat /opt/oracle/admin/DWS/bdump/dws_pmon_10277.trc
/opt/oracle/admin/DWS/bdump/dws_pmon_10277.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /opt/oracle/product/10.2.0
System name: SunOS
Node name: dws41
Release: 5.10
Version: Generic_138888-06
Machine: sun4u
Instance name: DWS
Redo thread mounted by this instance: 1
Oracle process number: 3
Unix process pid: 10277, image: oracle@dws41 (PMON)
**** 2012-03-02 19:18:31.509*
**** SERVICE NAME:(SYS$BACKGROUND) 2012-03-02 19:18:31.504*
**** SESSION ID:(1511.1) 2012-03-02 19:18:31.504*
Background process SMON found dead
Oracle pid = 8
OS pid (from detached process) = 10337
OS pid (from process state) = 10337
dtp = 380017a10, proc = 7fd001048
Dump of memory from 0x0000000380017A10 to 0x0000000380017A58
380017A10 0000007C 00000000 00000007 FD001048 [...|...........H]
380017A20 00000000 00000000 00000000 534D4F4E [............SMON]
380017A30 00020000 00000000 00002861 00000000 [..........(a....]
380017A40 00000000 4F507D38 00000001 327FA838 [....OP}8....2..8]
380017A50 00040081 00000000 [........]
Dump of memory from 0x00000007FD001048 to 0x00000007FD001830
7FD001040 02010000 00000000 [........]
7FD001050 00000000 00000000 00000000 00000000 [................]
7FD001060 00000000 00000000 00000007 FD6D0CD0 [.............m..]
7FD001070 00000007 FD700328 00000007 FD546D78 [.....p.(.....Tmx]
7FD001080 00000005 3C6FD110 00000000 00000000 [....<o..........]
7FD001090 00000005 3C6FD198 00000005 3C6FD198 [....<o......<o..]
7FD0010A0 00000007 FD700318 01160800 00000000 [.....p..........]
7FD0010B0 00000007 FD53FF88 00000007 FD544698 [.....S.......TF.]
7FD0010C0 00000008 00000000 00000000 00000000 [................]
7FD0010D0 00000000 00000000 00000000 00000000 [................]
7FD0010E0 00000007 FD6CE770 00000007 FD6D0D00 [.....l.p.....m..]
7FD0010F0 00000000 00000000 00000000 00000000 [................]
Repeat 3 times
7FD001130 00000000 00000000 00000012 00000000 [................]
7FD001140 00000000 00000000 0000000F 00000000 [................]
7FD001150 00000000 00000000 00000012 00000000 [................]
Repeat 1 times
7FD001170 00000000 00000000 0000000F 00000000 [................]
Repeat 1 times
7FD001190 00000000 00000000 00000012 00000000 [................]
Repeat 1 times
7FD0011B0 00000000 00000000 0000000E 00000000 [................]
7FD0011C0 00000000 00000000 00000008 00000000 [................]
7FD0011D0 00000000 00000000 00000012 00000000 [................]
7FD0011E0 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
7FD001210 00000000 00000000 00000004 00000000 [................]
7FD001220 00000000 00000000 00000000 00000000 [................]
7FD001230 4F50FF9A 00000000 00000000 00000000 [OP..............]
7FD001240 00000000 00000000 00000000 00000000 [................]
Repeat 1 times
7FD001260 00000007 FD001260 00000007 FD001260 [.......`.......`]
7FD001270 00000000 00000000 00000000 FFFFFFFF [................]
7FD001280 00000007 FD001280 00000007 FD001280 [................]
7FD001290 00000000 00000000 00000005 00000000 [................]
7FD0012A0 00000000 00000000 00000000 00000000 [................]
7FD0012B0 000000AB BABCDEFA 00000000 00000000 [................]
7FD0012C0 00000000 00000000 000000FF 7FFFC971 [...............q]
7FD0012D0 00000021 00000026 0008CBAA 00039976 [...!...&.......v]
7FD0012E0 00000005 3C003FB8 00000006 7E0037D0 [....<.?.....~.7.]
7FD0012F0 00000001 00000000 00000000 00000000 [................]
7FD001300 00000000 00000000 00000000 00000000 [................]
Repeat 1 times
7FD001320 00000000 00000000 00002861 00000000 [..........(a....]
7FD001330 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
7FD001360 00000000 00000000 00000007 FD001048 [...............H]
7FD001370 00000000 00000000 00000000 00000000 [................]
Repeat 4 times
7FD0013C0 00000000 00000000 00000001 00000000 [................]
7FD0013D0 00000000 00000000 00000000 00000000 [................]
Repeat 1 times
7FD0013F0 4F50FF9A 00000000 00000007 FD0013F8 [OP..............]
7FD001400 00000007 FD0013F8 00000000 00000000 [................]
7FD001410 00010000 00000000 00000000 01000057 [...............W]
7FD001420 0000000C 00000000 00002861 00000000 [..........(a....]
7FD001430 00000000 4F507D38 00000001 00000000 [....OP}8........]
7FD001440 00000000 00000000 00000000 00000000 [................]
Repeat 3 times
7FD001480 0000000F FFFFFFFF 00000000 00000000 [................]
7FD001490 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
7FD0014C0 00000000 00000000 00000020 00000000 [........... ....]
7FD0014D0 00000000 00000000 00000000 00000000 [................]
Repeat 8 times
7FD001560 00000000 00000000 6F726163 6C650000 [........oracle..]
7FD001570 00000000 00000000 00000000 00000000 [................]
7FD001580 00000000 00000000 00000000 00000006 [................]
7FD001590 64777334 31000000 00000000 00000000 [dws41...........]
7FD0015A0 00000000 00000000 00000000 00000000 [................]
Repeat 2 times
7FD0015D0 00000000 00000005 554E4B4E 4F574E00 [........UNKNOWN.]
7FD0015E0 00000000 00000000 00000000 00000000 [................]
7FD0015F0 00000000 00000000 00000000 00000008 [................]
7FD001600 31303333 37000000 00000000 00000000 [10337...........]
7FD001610 00000000 00000000 00000000 00000005 [................]
7FD001620 6F726163 6C654064 77733431 2028534D [oracle@dws41 (SM]
7FD001630 4F4E2900 00000000 00000000 00000000 [ON).............]
7FD001640 00000000 00000000 00000000 00000000 [................]
7FD001650 00000000 00000013 00000000 00000002 [................]
7FD001660 00000000 00000000 00000000 00000000 [................]
Repeat 9 times
7FD001700 00000000 00020000 00000000 00000000 [................]
7FD001710 00000000 00000000 00000000 00000000 [................]
7FD001720 00000003 BD4FFA28 00000005 3C0026F8 [.....O.(....<.&.]
7FD001730 00000006 7E000F40 00000000 00000000 [....~..@........]
7FD001740 00000003 BC691FD8 00000000 00000000 [.....i..........]
7FD001750 00000000 00000000 00000000 00000000 [................]
7FD001760 00000000 00000000 00000007 FD001768 [...............h]
7FD001770 00000007 FD001768 00000000 09EF0000 [.......h........]
7FD001780 00000000 086F0000 00000000 017A17D9 [.....o.......z..]
7FD001790 00000000 00273A49 00000000 13B817D9 [.....':I........]
7FD0017A0 00000000 00015030 00000000 0000A848 [......P0.......H]
7FD0017B0 00000000 001350A0 00000000 00000828 [......P........(]
7FD0017C0 00000000 000000E0 00000000 00000828 [...............(]
7FD0017D0 00000000 00000000 00000000 00000000 [................]
Repeat 4 times
7FD001820 32B310E7 000152FB 00000003 00000000 [2.....R.........]
error 474 detected in background process
ORA-00474: SMON process terminated with error
[10:20pm] root@dws41: #

Parallel query execution on Multiprovider with noncumulative KF

Hello !
We built a multiprovider (MP) on three not overlapping (disjunct?) basis cubes, which are all stock cubes, partitioned by 0PLANT and copies of 0IC_C03.
The Multiprovider-explain of TX RSRT says:
"The MultiProvider query is executed sequentially (reason: NCUM)".
Ok so far, maybe its not possible to execute queries in parallel on that multiprovider even if desirable.
But I found note 781921 which says as symptom:
"If a MultiProvider query with non-cumulative key figures is processed in a parallel way, the system terminates due to a type conflict". That means that queries CAN be executed in parallel on MPs with noncumulative key figures.
Does anybody know if that type of queries can run in parallel or not ??
Any advice is appreciated.
Kind regards, Philipp

Note 717451 solves this.

ORA-12801 error signalled in parallel query with ORA-00018 max # session

Hello,
I've just run dbca to create a new database. On completion I received the following:
ORA-12801 error was signalled in parallel query server
ORA-00018 maximum number of sessions exceeded
ORA-06512 at sys_utl_recomp line 760
ORA-06512 as sys_utl_recomp line 773
ORA-06512 as sys_utl_recomp line 1
The processes are set at 100, sessions is set at 115?
Can you tell how to address this error and resolve the problem? I'm thinking that I should rerun sys_utl_recomp

Hi,
You didn't mention oracle version as well OS.
might be you hit a bug.
check the below link for reference
https://metalink2.oracle.com/metalink/plsql/f?p=130:14:8051847734518941130::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,21564.1,1,1,1,helvetica
Regards,
Taj

How to set hint with SQL profile

Hi,
I need to put a leading hint into a sub-query
How can I do that ?
I tried:
dbms_sqltune.import_sql_profile
sql_text => 'select ...'
profile => sqlprof_attr(XXXXX) => I don't know what to set for XXXXX
name => my_sql_profile
force_match => true)10.2.0.4
Thanks for your help

I need to put a leading hint into a sub-query It doesn't sound like a good idea.
If you're going to hint - especially using plan stability features - then you need to hint fully otherwise you're asking for trouble.
See http://jonathanlewis.wordpress.com/2011/06/08/how-to-hint-1/
The "best" approach to this sort of generic question is to run the sql statement with the single leading hint (if that really is desirable) then extract the full set of hints from that execution (which will have a different sql id) and apply it to your original statement.
If you have a look at COE_XFR_SQL_PROFILE.SQL in Oracle Support doc id 215187.1 then that will give you a good idea of how to do it.
That script is not exactly what you want because it uses a sql profile to apply a previously generated plan for that specific sql taken out of AWR or the cursor cache, but the principle is the same.
This is using SQL Profiles as they were not originally designed - which was vehicles for statistical adjustements - but using them like stored outlines (the latter deprecated in 11.1 onwards).
SQL Profiles require the tuning pack.
You have not mentioned version but depending on that, it might be that SQL Plan Baselines are the appropriate mechanism and you can achieve something similar to that mentioned above using dbms_spm.load_plans_from_cursor_cache:
load_plans_from_cursor_cache
(sql_id           IN VARCHAR2,   <---------- the sql id of the manually hinted sql from which to copy the plan
plan_hash_value IN NUMBER := NULL, <-------------- the plan in memory to copy
sql_text         IN CLOB, <-------------------- the sql text of the sql to apply the plan above to (get via a direct look up from v$sql or dba_hist_sqltext as necesary)
fixed            IN VARCHAR2 := 'NO',
enabled          IN VARCHAR2 := 'YES') Whichever method you use, avoid any sort of solution involving a single hint directed at a subquery.
Edited by: Dom Brooks on Nov 26, 2012 9:48 PM
reworded

Stored Outlines on 10g as was on 9i

Hi everyone,
I built lots of stored outlines in 9i for our production database. The interface to do that by then was the java client/server enterprise manager.
When I upgraded to 10g the only outlines I could find was the sql advisor from the web enterprise manager, but it do not let me customize the plans the way I did on 9i.
I found out to be a packaged called dbms_sqltune, I wasn't able to do much with that package its kinda a way complex and less pratical.
How do I create a stored outlines on 10g?
Many will ask why to force a execution plan as the optimizer is very good? Well, in my experience sometimes the optimizer just don't know "business rules" enought to find the best execution plan for a report, he can guess on the cardinality of the columns but he can't guess that if a report is build to sales dept. then they will only use the 1000 and 1005 contracts on 99% of the cases that will represent a very small part of a huge table. To complete the scenario, many vendors do not open the code for us to "hint" their queries, so stored outlines was the way to go on those (many on my case) cases.
Thanks in advance for comments!
Ricardo Rodriguez

Ricardo,
Allow me to say a few words as I read your question just now.
Stored outlines will do exactly what you mentioned.Stored outlines are used to make sure that optimizer wont go for another plan from what you had opted.That's the basic goal in making and conceptulating outlines.The same concept is also there in 11g with Sql Plan Baselines.Therefore, stored outlines and SQL plan baselines are used to:
- ensure that a given execution plan is always used
- do SQL tuning without changing the code of the application
Stored outlines are indeed there in 10g.Please see this line here for 10gR2,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/outlines.htm#sthref1341
Now in the EM,there is no option(atleast I havenot seen one) to create them as the idea to use stored outlines never really got so popular.I agree those who use it,they like it very much but on a generic part, they were actualy a problem.Too many restrictions are there to implement and use them.
In 10g, this funcionality seems to be missing, you cannot 'hand made' a exection plan for the query anymore, you could just click on the advice of the sql advisor and pray to him find an solution.
In 10g the concept is enhanced a step further.Its always a bad idea to "hard-code" a plan for optimizer taking away its decision making sense.So Oracle is promoting for the same reasons which were there for outlines i.e. the query is a part of vendor application,you don't want to chance n number of parameters to tune one query only,they formulated stored profiles to do the job which does the same job but doesn't hard code the plan.SQL profiles are designed to provide to the query optimizer the information like:
- execution environment (e.g. optimizer mode)
- object statistics
- corrections related to the estimations performed by the query optimizer
As you can see, the aim of a SQL profile is "only" to change the environment in which the query optimizer works. The idea is that by changing the environment the query optimizer should be able to generated a more efficient execution plan.
I guess you would be clear with the part now.I wont even sya that outlines store the plan itself.Stored outlines, SQL plan baselines and SQL profile do not plans. They store hints which can be used to make up a plan.Yes the option in 10g from GUI is to just create Stored Profiles but not Stored Outlines which stands as a manualy done task.
Just my 2 cents on the topic.
Aman....

Parallel query hint with stored outlines

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