Can BI Server launch parallel query (with DOP 1)?

Hi guys,
I have some perfomance problems with some reports. These reports are quite siple, no aggregation, no measures...just columns coming from different dimensions.
The problem is that the size of the dimensions ranges from 1 milion to 10 milions of records and some dimensions are linked by "outer join" relationships. The physical query generated by the BI Server takes around 22 minutes but if i modify the same query adding the paralellism for the involved tables (e.g. select /*+ paralell(mytable 4) */ ...) i get the result in 5 minutes (1/4 of the time).
So is there any way to force the BI server to use a degree (DOP) > 1 for the all/some physical tables?
What about using indexes (I didn't create any index yet, maybe i should start to use them for primary/foreign keys)?
Of course, others solutions to fix this issue are appretiated! :-)
Thanks in advance,
Nazza

Nazza,
Did you try out the HINT feature(Physical Table ->>General Tab -->>HINT) available in physical layer. You can use parallel hint there and the query generated would use the same while firing it to the database.
Indexex are good to have but do check with your DBA, which index would be more cost effective to your query.
Cheers
Dhrubo

Similar Messages

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

Can there be a parallel user with exact same privilages as weblogic in 11g

Hi Gurus
Can there exist a parallel user having all capabilities that web logic user has.
Thanks

Yes, you can have as many as you want. Login as web logic, and go to roles and groups tab under my account, which is located on the top hand right corner of the analytics. Get the list of application roles, the web logic account has, and assign any number of users to the same set of roles, to get same privileges as web logic.
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Can't create a new query with an error msg

We used to create a query called, eg, Q, then we copied it to Q_1 and deleted Q, but somehow when we try to rename the copied query Q_1 back to Q by creating a new query called Q, get error msg saying that 'Query name Q exists already'. When we try to find the query from BEX analysor, can't find it, and also the query is not an entry of the table RSZCOMPDIR. Somehow the query Q still exists somewhere in the system.
Anyone's idea is greatly appreciated on how to resolve the problem!

hi Kevin,
with RSZDELETE, the query visible ?
check thread
Deleting "Ghost" queries
Deleting queries using RSZDELETE
try program ANALYZE_RSZ_TABLES ? (OSS Note 792779)
hope this helps.

VLV & Server Side Sort Query with ODSEE 11g

Hi
We are trying to integrate Microsoft FIM with ODSEE.. When FIM does a Full Import it with VLVControl and SortControl ON it gets the following error
1100 objects were returned on import, exceeding the configured page size in the Run Profile of 500. Only the first 500 objects were processed. Import aborted.
Now looking at ODSEE Logs it does the following
[27/Mar/2015:08:29:40 +1100] conn=1 op=1 msgId=402743 - SRCH base="<BASENAME>" scope=2 filter="<FILTER NAME>" attrs="<LONG LIST OF ATTRIBUTES>"
[27/Mar/2015:08:29:40 +1100] conn=1 op=1 msgId=402743 - SORT dn
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[27/Mar/2015:08:29:40 +1100] conn=1 op=1 msgId=402743 - SORT dn
[27/Mar/2015:08:29:40 +1100] conn=1 op=1 msgId=402743 - VLV 0:499:0:0 1:4 (0)
[27/Mar/2015:08:29:40 +1100] conn=1 op=1 msgId=402743 - SORT dn
[27/Mar/2015:08:29:40 +1100] conn=1 op=1 msgId=402743 - VLV 0:499:0:0 1:6412 (0)
[27/Mar/2015:08:29:41 +1100] conn=1 op=1 msgId=402743 - SORT dn
[27/Mar/2015:08:29:41 +1100] conn=1 op=1 msgId=402743 - VLV 0:499:0:0 1:685 (0)
[27/Mar/2015:08:29:41 +1100] conn=1 op=1 msgId=402743 - SORT dn
[27/Mar/2015:08:29:41 +1100] conn=1 op=1 msgId=402743 - VLV 0:499:0:0 1:232 (0)
[27/Mar/2015:08:29:41 +1100] conn=1 op=1 msgId=402743 - RESULT err=0 tag=101 nentries=1100 etime=1
[27/Mar/2015:08:29:55 +1100] conn=3 op=2 msgId=402744 - UNBIND
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Not well versed with VLV and sort index..

Hello,
Could you try to perform an equivalent search with the ldapseatch that comes with DSEE and check how many entries are returned ?
See ldapsearch(1) (Sun Java System Directory Server Enterprise Edition 6.2 Man Page Reference) , option -G
If the ldapsearch returns more than 500 entries, I would encourage you to contact the Oracle Support.
-Sylvain
Please mark this response as correct or helpful when appropriate to make it easier for others to find it

How Can I increase performance of Query with Distinct Keyword

Dear Experts,
In my Query when I execute this without Distinct it give result very soon,
But when I excute this with Distinct its performance is very slow is there any option for increase the performance with Distinct .
I have to use Distinct according to our rewuirement.

neither DISTINCT nor GROUP BY do sort. If you need to sort, use ORDER BY. Slight correction, they do a sort, but your results are not guarenteed to be sorted.
The overhead of a sort is incurred, if your results is large enough (my test below isn't) you will be sorting to disk. Which as we all know can be very slow.
9i:
SQL> SET TRIMSPOOL ON
SQL> CREATE TABLE D (A VARCHAR2(2));
Table created.
SQL> INSERT INTO D (A) SELECT DBMS_RANDOM.STRING('U',2) FROM DUAL CONNECT BY LEVEL <= 5000;
5000 rows created.
SQL> COMMIT;
Commit complete.
SQL> SET AUTOTRACE TRACEONLY EXPLAIN;
SQL> SELECT DISTINCT A FROM D;
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE
   1    0   SORT (UNIQUE)
   2    1     TABLE ACCESS (FULL) OF 'D'
SQL> SELECT A FROM D GROUP BY A;
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE
   1    0   SORT (GROUP BY)
   2    1     TABLE ACCESS (FULL) OF 'D'
SQL> SELECT DISTINCT A FROM D ORDER BY A;
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE
   1    0   SORT (UNIQUE)
   2    1     TABLE ACCESS (FULL) OF 'D'
SQL> SPOOL OFF10g
SQL> SET TRIMSPOOL ON
SQL> CREATE TABLE D (A VARCHAR2(2));
Table created.
SQL> INSERT INTO D (A) SELECT DBMS_RANDOM.STRING('U',2) FROM DUAL CONNECT BY LEVEL <= 5000;
5000 rows created.
SQL> COMMIT;
Commit complete.
SQL> SET AUTOTRACE TRACEONLY EXPLAIN;
SQL> SELECT DISTINCT A FROM D;
Execution Plan
Plan hash value: 3079699766
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      | 5000 | 15000 |     7 (29)| 00:00:01 |
|   1 | HASH UNIQUE       |      | 5000 | 15000 |     7 (29)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| D    | 5000 | 15000 |     5   (0)| 00:00:01 |
Note
   - dynamic sampling used for this statement
SQL> SELECT A FROM D GROUP BY A;
Execution Plan
Plan hash value: 2712634873
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      | 5000 | 15000 |     7 (29)| 00:00:01 |
|   1 | HASH GROUP BY     |      | 5000 | 15000 |     7 (29)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| D    | 5000 | 15000 |     5   (0)| 00:00:01 |
Note
   - dynamic sampling used for this statement
SQL> SELECT DISTINCT A FROM D ORDER BY A;
Execution Plan
Plan hash value: 1773491675
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      | 5000 | 15000 |     8 (38)| 00:00:01 |
|   1 | SORT UNIQUE       |      | 5000 | 15000 |     7 (29)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| D    | 5000 | 15000 |     5   (0)| 00:00:01 |
Note
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SQL> SPOOL OFF

How can I send a post query with attached data using Labview?

Hi,
I need to send data (a file of 5KB) to a php server.
In order to do it, I need to send a post request with attached data.
I'm using Labview 6.1 and I have the Internet Toolkit.
But I just see the Get Method. Isn't implemented the post method in Labview?
Thanks for your help
Best regards

Hi,
In order to use the POST request method as opposed to the GET request method I used a VI set up as shown in the attached GIF.
From the front panel you need to provide values for the 3 inputs. "Bytes to read" is an arbitrarily large number that meets or exceeds the maximum number of bytes you expect as a response from your server. "Address" is just the URL of the server, e.g. "10.90.1.1" or "localhost" or "www.google.com". "Data in" is the actual request you're sending with the data included.
"Data in" would be in a format similar to everything in the quotes below (important to have 2 carriage returns to finish the request);
POST /phppage.php HTTP/1.1
Content-Length: ??
Host: http://www.mywebserver.com
Content-Type: application/x-www-form
-urlencoded
email=[email protected]&password=mypassword
For sending your data file you just have to set the requisite MIME-type and then include the file data in place of the form data in the example above.
Hope this helps,
Neil
Attachments:
LV_TCP_code.gif ‏4 KB

Can I run windows xp sp0 with parallel under snow leopard?

I am needing to run some windows applications on my Imac1,5 [intel, late 2006] since I cannot seem to connect via remote desktop. I am getting very mixed signals regarding whether I can run Windows XP Professional SP0 [which I own with my rickety old Dell PC] on either Bootcamp or Parallels; my OS is Snow Leopard.
Can anyone help me with this?
Thanks!

I can't speak for Parallels but with VMWare Fusion it worked fine. After it's installed I would recommend letting XP update itself, I think it's on Service pack 3 now.

Partitioning For Optimal Parallel Query Execution

Hi All,
We are trying to design an architecture that benefits from partitioning and parallel query to obtain the best query response times for our system.
Let me start by describing the main table which has five columns:
Columns:
1) DocId ------- Numeric Primary Key Constraint (Unique)
2) Text ------- CLOB of XML Content
3) SCode ------- Varchar 12 ( service code Can be one of 200 values)
4) A_Date ------- Oracle Date ( The arrival date )
5) A_Month ------- Numeric partition key, the month number (1-12)
We insert 100,000 records daily so a month of data will contain 3,000,000 rows. The Text varies from 4k to 200k bytes and on average is around 30k bytes per document. A_Date is obtained when the C++ application receives a client connection. After document transmission is complete the DocId is obtained from an Oracle sequence. It is true that A_Date and DocId increase together. However because of varying document sizes and transmission rates, there is no guarantee that consistent order between the two columns exists.
For Example: If time (t) increases and the connection times are: t1, t2, t3, t4 and the document at t2 took long to transmit, we can have:
A_Date -------- DocId (From Oracle Sequence)
t2 -------------- 1004
t4 -------------- 1003
t3 -------------- 1002
t1 -------------- 1001
A_Month is simply the month number (1-12) extracted from the transmission entry timestamp. It is also our Partition Key (see below). When the year wraps around from 2006 to 2007, data for January will simpy fall into the 1st partition bucket, and so on..
QUERY NEEDS: Our queries are centered around a DateTime interval Where the left endpoint is current day/time. They can query the current day, current to 1 month back, current to 2 months back, .. current to 15 months back. We MUST RETURN a list of DocId's sorted in DESCENDING ORDER for screen display purposes.
In General we need to return sub-second for the 1st month. As we query further back in time longer response times between 1 and 4 seconds are acceptable.
PARTITIONING AND INDEXES:
The table is partitioned by A_Month as shown below:
Create Table IndexTable
PARTITION BY RANGE (A_Month)
( PARTITION p1 VALUES LESS THAN 1.1 ...
PARTITION p2 VALUES LESS THAN 2.1 ...
PARTITION p3 vALUES LESS THAN 3.1 ...
There are GLOBAL INDEXES on DocId, Text(Domain Index), and SCode.
A_Date is a LOCAL INDEX.
QUERY STRUCTURE:
My Query structure looks like this (for a 2 month query):
SELECT DocId from IndexTable WHERE
Contains (Text, 'BUSH and EARNINGS') > 0 AND
SCode in ('S1', 'S2', 'S3', 'S4') AND
A_Date Between '2006-01-15 11:00:00' AND '2006-03-15 11:00:00'
Order By DocId DESC;
QUESTIONS (THERE ARE THREE)
#### QUESTION 1 ####
As I examine various explain plans, the PSTART and PSTOP do not reflect consistency with my A_Date range. It seems to always display:
PStart PStop
RowId RowId
no matter what my A_Date range is.. I don't see it pruning my partitions. I cannot find documentation as to what RowId means or how it affects the optimizer's plan.
#### QUESTION 2 ####
I have tried parallelization hints on the table and indexes such as
/*+ PARALLEL( IndexTable, 4) */ and on the A_Date index
/*+ PARALLEL_INDEX( IndexTable, A_Date_Index, 4) */.
I can't really tell if the parallel hints make a difference.
However, the FIRST_ROWS hint makes a big difference if I nest the query inside a rownum clause as:
SELECT * from
( Select /+* first_rows */ ... WHERE CONTAINS... > 0 AND... )
Where ROWNUM <=20;
#### QUESTION 3 ####
I'm running close to the latest RedHat Linux and Oracle 10g2 and I have read about Parallel Slave Processes in Tom Kyte's Expert Oracle Architecture book in which he says you should see processes like:
ora...p000..
ora...p001..
ora...pnnn..
Which are the parallel slave processes. I have NEVER seen any oracle processes numbered as such running on my system when I run test queries. I have seen some q_ processes and others, but not the pnnn processes..
Can I benefit from parallel query without ever seeing these processes??
I Greatly Appreciate Any Advice To Any Of These Questions..
Joe

Well I can tell you this much. You will never get partition pruning if you don't have the partition key in the where clause.
I'm not sure about the parallel query. There was a time that this wasn't supported with Text indexes, but not sure if that still applies today.
In theory there are two levels of partitioning that can be defined that you may want to test out.
1st, range partition the base table and create a partitioned text index based on that. This is what you are currently doing.
2nd, in the storage preference for the $I table specify a range or hash partition (I've never tried this, but in theory it should work) on the token_text column. Try this out and see if it works.

Error during search !!! Associate Search Query with Indexes !!!

We are trying to implement a simple index with Trex Search .
We have done the following tasks :
1. Created my index
2. Assigned data to the the indexes
3. Created taxonomies for classification indexes
4. Created my search query asociated to the index
When we try to search with the iview search , we got this error : <i><b>"Error during search occurred - com.sapportals.wcm.WcmException: A received argument has an invalid value (Errorcode 18)"</b></i> .
We think that something is missing and for that we need to know how can we
associate the search query with the index ?
After the step 4), what we have to do in order to get this implementation (search working)
Please send us any ideas ..
THANKS !!!

Dear Ato
Check in IMG Path - Enterprise Structure --> Assignment --> Logistis Execution --> Assign warehouse number to plant/storage location.
Here check whether the warehouse number is assigned to your plant and storage location.
thanks
G. Lakshmipathi

Rest query with filter sub-string (contains, not eq)

Hi,
how can I do a REST-query with a filter for a string-column which is only a sub-string? I only found EQ, for example $filter=(name EQ 'tom') which compares the whole string.
But I would like to query records, where a string-column CONTAINS a specific sub-string.
Thx, Tom

Hi Tom,
Do you use it on azure Data Market place? Did you try to add "*" on your query string, like this
post.
Also, you could try this tool from this
thread. Also, for this issue, I suggest you could post it on
SQL forum for better support.
If I misunderstood, please let me know.
Regards,
Will
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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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: #

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-12801: error signaled in parallel query server P000

Hello All,
Week before one of the APPLY process ABORTED with following error:
ORA-12801: error signaled in parallel query server P000
ORA-04031: unable to allocate 104 bytes of shared memory ("streams pool","unknown object","apply shared t","knalfGetTxn:lcr")
We are using ORACLE 10.2.0.4.0 on HP unix B.11.23
For now, I have started the APPLY process again and it's working properly.
When I looked into the trace file it shows following
A001: [enq: TM - contention] name|mode=544d0002, object #=2a67, table/partition=0
*** 2009-06-15 10:53:57.897
A001: warning -- apply server 1, sid 302 waiting on user sid 267 for event (since 302 seconds):
A001: [enq: TM - contention] name|mode=544d0002, object #=2a67, table/partition=0
*** 2009-06-15 10:58:58.792
A001: warning -- apply server 1, sid 302 waiting on user sid 267 for event (since 603 seconds):
A001: [enq: TM - contention] name|mode=544d0002, object #=2a67, table/partition=0
*** 2009-06-15 12:14:36.679
A001: [enq: TX - row lock contention] name|mode=54580004, usn<<16 | slot=90028, sequence=1b743
*** 2009-06-15 12:19:36.961
A001: warning -- apply server 1, sid 302 waiting on user sid 181 for event (since 300 seconds):
A001: [enq: TX - row lock contention] name|mode=54580004, usn<<16 | slot=90028, sequence=1b743
*** 2009-06-15 12:24:37.417
A001: warning -- apply server 1, sid 302 waiting on user sid 181 for event (since 600 seconds):
A001: [enq: TX - row lock contention] name|mode=54580004, usn<<16 | slot=90028, sequence=1b743
*** 2009-06-15 12:29:37.906
A001: warning -- apply server 1, sid 302 waiting on user sid 181 for event (since 901 seconds):
A001: [enq: TX - row lock contention] name|mode=54580004, usn<<16 | slot=90028, sequence=1b743
*** 2009-06-15 12:34:37.428
A001: warning -- apply server 1, sid 302 waiting on user sid 181 for event (since 1201 seconds):
A001: [enq: TX - row lock contention] name|mode=54580004, usn<<16 | slot=90028, sequence=1b743
*** 2009-06-19 11:26:44.601
A001: [enq: TX - row lock contention] name|mode=54580006, usn<<16 | slot=8001e, sequence=1a4af
*** 2009-06-19 11:31:43.753
A001: warning -- apply server 1, sid 302 waiting on user sid 212 for event (since 300 seconds):
A001: [enq: TX - row lock contention] name|mode=54580006, usn<<16 | slot=8001e, sequence=1a4af
*** 2009-06-19 11:36:44.149
A001: warning -- apply server 1, sid 302 waiting on user sid 212 for event (since 600 seconds):
A001: [enq: TX - row lock contention] name|mode=54580006, usn<<16 | slot=8001e, sequence=1a4af
*** 2009-06-19 11:41:43.775
A001: warning -- apply server 1, sid 302 waiting on user sid 212 for event (since 900 seconds):
A001: [enq: TX - row lock contention] name|mode=54580006, usn<<16 | slot=8001e, sequence=1a4af
*** 2009-06-23 16:55:24.002
A001: [enq: TM - contention] name|mode=544d0004, object #=2c05, table/partition=0
*** 2009-06-29 09:48:58.166
A001: [enq: TM - contention] name|mode=544d0004, object #=2c05, table/partition=0
*** 2009-07-01 06:02:37.236
A001: [enq: TM - contention] name|mode=544d0004, object #=2c05, table/partition=0
*** 2009-07-01 11:46:43.672
error 12801 in STREAMS process
ORA-12801: error signaled in parallel query server P000
ORA-04031: unable to allocate 104 bytes of shared memory ("streams pool","unknown object","apply shared t","knalfGetTxn:lcr")
OPIRIP: Uncaught error 447. Error stack:
ORA-00447: fatal error in background process
ORA-12801: error signaled in parallel query server P000
ORA-04031: unable to allocate 104 bytes of shared memory ("streams pool","unknown object","apply shared t","knalfGetTxn:lcr")
Can you please help to provide details on that how i can fix this problem permanetely.
Any suggestions would be great!
Thanks,
Nick

It seems that you are using Oracle database and not Berkeley Database.
To fix ORA-04031 errors on streams pool, you need to increase streams pool size with
alter system set streams_pool_size=<the right value>;See recommandations in http://download.oracle.com/docs/cd/B19306_01/server.102/b14229/strms_mprep.htm#i1006278

ORA-12801: error signaled in parallel query server P007

Hi friends,
I am running a update on a big table with parallel clause.
I got the below error.Can someone help what should i next? This query takes a long time to execute(nearly 1 hour).
I searched on google and metalink but no success yet.
=======
ORA-12801: error signaled in parallel query server P007
ORA-00001: unique constraint (VEL5APPO.BL1_CHARGE_PK) violated
=======
Cheers,
Kunwar

Kunwar wrote:
Hi friends,
I am running a update on a big table with parallel clause.
I got the below error.Can someone help what should i next? This query takes a long time to execute(nearly 1 hour).
I searched on google and metalink but no success yet.
=======
ORA-12801: error signaled in parallel query server P007
ORA-00001: unique constraint (VEL5APPO.BL1_CHARGE_PK) violated
=======Not sure why you think this a complex and unusual and difficult to understand error. It is very clear what is happening.
WHAT: your code violates constraint VEL5APPO.BL1_CHARGE_PK that says that one or more columns must contain unique values.
Who says it? That is specified by the first line in the error stack.
WHO: parallel query process 7 ran into the constraint error
So what's happening? Your SQL is executed in parallel. Up to 7 PX slaves are used to run your SQL - with each slave running the SAME SQL for DIFFERENT rowid ranges. PX slave 7 attempted an insert/update that would have resulted in a duplicate row. The database constraint protecting the integrity of that table, prevented it.
So the error is very clear as to what is wrong, why it is wrong, and where it is happening.
I fail to understand that you search google and metalink and failed to find answers, when the error is meaningful....?

Can BI Server launch parallel query (with DOP 1)?

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