Update statement takes long time - Why so ?

Dear DBAs;
Daily update statement takes 20 mins. But today update takes more time.
What is the reason how to resolve ?
Thanks in advance ..

8f953842-815b-4d8c-833d-f2a3dd51e602 wrote:
Dear DBAs;
Daily update statement takes 20 mins. But today update takes more time.
What is the reason how to resolve ?
Thanks in advance ..
More time? How much more?

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Replication update statement takes long time

Hi Replication experts,
I have a issue and please suggest if my understanding and solution is correct.
We have a transactional replication setup for data warehouse, from today morning replication got huge latency so when I looked into it I saw the "sp_MSupd_< tablename >" was running for very long time and by this time it was running for 9 hours
still no data was updated, Latency went very high. What we feel is that the index maintenance was not done in subscriber also it was not replicated too. So due to high fragmentation the update statement could take very long.
As there was no error message or blocks found all we see is the update taking very long. So to avoid this we are planning to remove the index, as this is just data warehouse index maintenance is not required by removing we can gain some space too. Is this a
good Idea to implement?
When we ran profiler nothing was found, no error or alert logged.
Please let me know your suggestions
Thanks
Best Regards Moug

Hi All,
The Issue we found to be is that a day before, new column was added to the table and 9000 rows were updated ... This caused the distributor to slow down the update operation as the index in subscriber(15 million rows) was updating every time a row
is updated.. So we suspect that adding a new column and updating it at the same time is the culprit..
But still am not convinced as per my understanding the distributor operates by comparing the primary key of publisher that was changed with the primary key of the subscriber and apply those change.. If that is the case why should it worry about the new column
added or the number of updates..
Also one strange thing is another table was also lagging behind in its operation ,though that table was updated with just 18 rows.. So in a nutshell the update operation was totally down by distributor operation on that day..
Can someone please shed some light on this, Replication is my favorite topic but now I got fear of it.. after failing to know what could be issue...
Best Regards Moug

Why update query takes long time ?

Hello everyone;
My update query takes long time. In emp ( self testing) just having 2 records.
when i issue update query , it takes long time;
SQL> select * from emp;
EID ENAME     EQUAL     ESALARY     ECITY    EPERK       ECONTACT_NO
      2   rose              mca                  22000   calacutta                   9999999999
      1   sona             msc                  17280    pune                          9999999999
Elapsed: 00:00:00.05
SQL> update emp set esalary=12000 where eid='1';
update emp set esalary=12000 where eid='1'
* ERROR at line 1:
ORA-01013: user requested cancel of current operation
Elapsed: 00:01:11.72
SQL> update emp set esalary=15000;
update emp set esalary=15000
* ERROR at line 1:
ORA-01013: user requested cancel of current operation
Elapsed: 00:02:22.27

Hi BCV;
Thanks for your reply but it doesn't provide output, please see   this.
SQL> update emp set esalary=15000;
........... Lock already occured.
>> trying to trace >>
SQL> select HOLDING_SESSION from dba_blockers;
HOLDING_SESSION
            144
SQL> select sid , username, event from v$session where username='HR';
SID USERNAME     EVENT
   144   HR    SQL*Net message from client
   151   HR    enq: TX - row lock contention
   159   HR    SQL*Net message from client
>> It does n 't provide clear output about transaction lock >>
SQL> SELECT username, v$lock.SID, TRUNC (id1 / POWER (2, 16)) rbs,
2 BITAND (id1, TO_NUMBER ('ffff', 'xxxx')) + 0 slot, id2 seq, lmode,
3 request
4 FROM v$lock, v$session
5 WHERE v$lock.TYPE = 'TX'
6 AND v$lock.SID = v$session.SID
7 AND v$session.username = USER;
no rows selected
SQL> select MACHINE from v$session where sid = :sid;
SP2-0552: Bind variable "SID" not declared.

SELECT statement takes long time

Hi All,
In the following code, if the T_QMIH-EQUNR contains blank or space values ,SELECT statement takes longer time to acess the data from OBJK table. If it T_QMIH-EQUNR contains values other than blank, performance is good and it fetches data very fast.
Already we have indexes for EQUNR in OBJK table.
Only for blank entries , it takes much time.Can anybody tell why it behaves for balnk entries?
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        REFRESH T_OBJK.
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Ajay

Hi
You can use the field QMIH-QMNUM with OBJK-IHNUM
in QMIH table, EQUNR is not primary key, it will have multiple entries
so to improve the performance use one dummy internal table for QMIH and sort it on EQUNR
delete adjacent duplicates from d_qmih and use the same in for all entries
this will improve the performance.
Also use the fields in sequence of the index and primary keys also in select
if not T_QMIH[] IS INITIAL.
SORT T_QMIH BY EQUNR.
REFRESH T_OBJK.
SELECT EQUNR OBKNR
FROM OBJK INTO TABLE T_OBJK
FOR ALL ENTRIES IN T_QMIH
WHERE IHNUM = T_QMIH-QMNUM
OBJK~TASER = 'SER01' AND
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regards
Shiva

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Deleting rows can be an expensive operation.
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Hi All,
The following query is taking too much time for update the 100000 records.
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DECLARE
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Hoek wrote:
Second: you're doing row-by-row (= slow-by-slow) processing.
See if you can rewrite your code into a single SQL UPDATE statement that will process an entire SET at once.Well to be nitpicking. The op already does a single big update. He just does it again and again and again for each account id. Each time completely overwriting the values from the last account id.

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Update statement takes long time - Why so ?

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