Procedure using lot of temp space
Hi all,
DB version is 10.2.0.4. A procedure named xxxx while executing using 10gb of temp tablespace...What are the basic checklist of tuning that procedure...
thanks,
baskar.l
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/toc.htm
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SQL query using lot of Temp space
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Rajanuse {noformat}<your code here>{noformat} tags to format your code.
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Edited by: user10745648 on Mar 5, 2013 2:00 PM
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Edited:
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Query on V$STREAMS_APPLY_COORDINATOR used large temp space
Hi
My database recently experience ORA-1652 error consistently on temp tablespace. I found out the query to cause this was an OEM query SELECT APPLY_NAME,TOTAL_RECEIVED,TOTAL_ASSIGNED,TOTAL_APPLIED FROM V$STREAMS_APPLY_COORDINATOR, which uses over than 800M temp space frequently. I am not sure why is this, I can query the same select statement in sqlplus, it returns immeidatly. Can anyone help to teach me on this? Thanks.
The query to find the user for temp tablespace is.
SELECT S.sid || ',' || S.serial# sid_serial, S.username, Q.hash_value, Q.sql_text,
T.blocks * TBS.block_size / 1024 / 1024 mb_used, T.tablespace
FROM v\$sort_usage T, v\$session S, v\$sqlarea Q, dba_tablespaces TBS
WHERE T.session_addr = S.saddr
AND T.sqladdr = Q.address
AND T.tablespace = TBS.tablespace_name
ORDER BY mb_used)
where mb_used >=800;
I got
SID_SERIAL USERNAME HASH_VALUE SQL_TEXT MB_USED TABLESPACE
1626,1 DBSNMP 3741683138 /* OracleOEM */ SELECT APPLY_NAME,TOTAL_RECEIVED,TOTAL_ASSIGNED,TOTAL_APPLIED FROM V$STREAMS_APPLY_COORDINATOR 880 TEMP1Hi
My database recently experience ORA-1652 error consistently on temp tablespace. I found out the query to cause this was an OEM query SELECT APPLY_NAME,TOTAL_RECEIVED,TOTAL_ASSIGNED,TOTAL_APPLIED FROM V$STREAMS_APPLY_COORDINATOR, which uses over than 800M temp space frequently. I am not sure why is this, I can query the same select statement in sqlplus, it returns immeidatly. Can anyone help to teach me on this? Thanks.
The query to find the user for temp tablespace is.
SELECT S.sid || ',' || S.serial# sid_serial, S.username, Q.hash_value, Q.sql_text,
T.blocks * TBS.block_size / 1024 / 1024 mb_used, T.tablespace
FROM v\$sort_usage T, v\$session S, v\$sqlarea Q, dba_tablespaces TBS
WHERE T.session_addr = S.saddr
AND T.sqladdr = Q.address
AND T.tablespace = TBS.tablespace_name
ORDER BY mb_used)
where mb_used >=800;
I got
SID_SERIAL USERNAME HASH_VALUE SQL_TEXT MB_USED TABLESPACE
1626,1 DBSNMP 3741683138 /* OracleOEM */ SELECT APPLY_NAME,TOTAL_RECEIVED,TOTAL_ASSIGNED,TOTAL_APPLIED FROM V$STREAMS_APPLY_COORDINATOR 880 TEMP1 -
HI all,
I receive an error while executing a procedure.
ORA-01652: unable to extend temp segment by 128 in tablespace TEMP
can any one please exlain what is the problem.
thanks in advance
baskar khi
First ORA-01652 may occur because there is simply no space available in the temp tablespace of which is being used. The second cause of ORA-01652 may have to do with the local temp segment not being able to extent space even though there is space in other instances.
To trouble shoot for ORA-01652, and find out which of the above scenarios are causing ORA-01652 use this query offered by MetaLink:
select sum(free_blocks)
from gv$sort_segment
where tablespace_name = '<TEMP TABLESPACE NAME>'
You will know that the first scenario is causing ORA-01652 to be thrown if the free block reads '0' because it signifies that there is no free space.
If there is a good amount of space, you know that there is another cause for ORA-01652, and it is probably the second scenario. It is important to note that in a non-RAC environment, local instances are not able to extend the temp segments, so in the RAC environment, ORA-01652 has to be handled differently. If you are experiencing ORA-01652 in a non-RA environment, be aware that every SQL making use of the tablespace can fail.
In RAC, more sort segment space can be used from other instances, which can help resolve ORA-01652 more easily. Try using the query below:
select inst_id, tablespace_name, total_blocks, used_blocks, free_blocks
from gv$sort_segment;
Basically, you can then find out how much temp segment space can be used for each instance by viewing the total_blocks, and the used_blocks can reveal the space which has been used so far, and and the free_blocks gives the amount of space allocated to this particular instance. This being, to resolve ORA-01652, you can check out that used_blocks = total_blocks and free_blocks = 0 will probably show for the instance, and ORA-01652 will be shown multiple times within the alert log.
This basically means that free space from other instances is being requested, and typically signifies that there is instance contention. Instance contention within the temporary space can make the instance take more time to process.
In sever cases, a slowdown may occur, in which you might want try one of the following work-arounds:
Increase size of the temp tablespace
Increase sort_area_size and/or pga_aggregate_target
However, remember to not use the RAC feature of DEFAULT temp space.
If ORA-01652 is causing the slowdown, SMON will probably not be able to process the sort segment requests, you you should try to diagnose the contention:
Output from the following query periodically during the problem:
select inst_id, tablespace_name, total_blocks, used_blocks, free_blocks
from gv$sort_segment;
Global hanganalyze and systemstate dumps
Hope this helps
CHeers -
Dear All
A technical colleague of mine is executing a procedure which selects data from two databases and inserts it into the third one. The procedure is not new and he has been executing the same since a year now.However in past two weeks the procedure is either consuming too much amount of time ( 3-4 hours as against 10-12 mins ) or it fails as it utilises more amount of temp space on the database on which insertions are made. In the temporary tablespace i added about 10gb more but it is still not suffice for the procedure to execute successfully.The sga for the database onto which insertion is done is 2560M and pga for the same is 2G.
Please suggest what is to be done as it is an extremely crucial procedure.
Thanks in advance.
Regards
rdxdbaIf you have Diagnostic Pack licence try to use AWR to compare instance activity for this procedure execution. If not try to install Statspack.
I recommend also to use SQL trace to have trace data for a "good" execution and for a "bad" execution and to compare TKPROF output for related trace files.
If you are using Oracle 10 or 11 try to use DMBS_MONITOR as described in http://www.oracle-base.com/articles/10g/SQLTrace10046TrcsessAndTkprof10g.php. -
Oracle.sql.BLOB.freeTemporary() is not freeing TEMP space in the database
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We are using oracle.sql.BLOB to store some file information into the database.
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BLOB blob=BLOB.createTemporary(conn, false, BLOB.DURATION_SESSION); // this results in the usage of TEMP space from database
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Thanks,
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