Performance Tuning :: TKPROF Output For Session
Jun 9, 2010
understanding the TKPROF output for the session that was executing an insert statement(inserting 70 lakh data) on which a row level trigger get fired and select from following table.The trace was run for 1 hour.
Table name - > GS_MAP_RCC_CCIT
This table is having 37 rows as in on single block and having primary key index on RCC_NUM that is also contained on single block.We are getting maximum wait events on db_file_sequential_read.
As per my understanding this is due to the contention for the same block because for each row these queries get fired.
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May 13, 2011
why there is no "Row Source Operation" information when I trace a long and complicated SQL query (It takes at least 25 minutes ro run)?
However, I can get the "Row Source Operation" information for a simple SQL Query.
Here are the tkprof output for a simple query and complicated query:
tkprof Output for a simple query
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 13 0.00 0.00 0 16 0 173
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 15 0.00 0.00 0 16 0 173
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 3139
Rows Row Source Operation
------- ---------------------------------------------------
173 TABLE ACCESS FULL MY_TABLE (cr=16 pr=0 pw=0 time=0 us)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 13 0.00 0.00
SQL*Net more data to client 24 0.00 0.00
SQL*Net message from client 13 5.33 5.47
Tkprof output for a complex query
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.38 0.40 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 2 0.38 0.40 0 0 0 0
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 3139
No Row Source Operation information here Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 1 0.00 0.00
db file sequential read 73062 0.25 692.23
db file scattered read 16099 0.18 76.65
latch: shared pool 4 0.02 0.03
latch: cache buffers chains 3 0.04 0.04
latch free 16 0.00 0.00
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Apr 10, 2013
i want to know about trace file and TKPROF. any example.
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Aug 31, 2011
I am trying to run a trace file with TKPROF. It throws an error :
MEMORY FAULT
The size of the trace file is 8MB. I tried with some other file trace files bigger in size (10MB) than the above file, it works fine. I tried seeing any permission right is required on that trace file is required for the tkprof to excute, but it has got the same permissions like the other trace files.
The problem is that it is not showing any error number or any other Error Description other than "MEMORY FAULT".
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Jan 13, 2011
find the attached tkprof'ed file of session
I started the trace after the query started (upon user's complaint)
However even after tracing the session for more than 30 minutes I am not geeting where the 30 minutes are accounted in this file
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Jun 11, 2010
How can i differentiate between system issued sql's and user issued sql's in the tkprof report ?
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May 25, 2010
Doing some data conversion at the moment and using V$SESSION_LONGOPS to predict when the current task will be finished so I can run the next one.
V$SESSION_LONGOPS seems to have only the last 16 long operations for the session. Older operations are automatically purged. My bigger tables have 32 partitions, so after the first 16 are processed, I cannot tell which partition I am up to.
Googling "old longops" and "longops history" didn't work, nor did the same searches on this site. The Oracle Reference manual section on V$SESSION_LONGOPS did not mention that older entries are purged.
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Dec 12, 2010
Even though the users are not logged in why the V$SESSOIN shows the SID and why many times?
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Apr 4, 2012
dbo is a table with 1M records and structure similar to dba_objects
The following queries which does FTS, access same number of blocks as observed in v$session_longops
select * from dbo;
and
select * from dbo where object_type='VIEW';
Ex.
select * from dbo where object_type='VIEW';
select * from table(dbms_xplan.display_CURSOR(null,null,'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------
------------------------------------------------------------------------------
SQL_ID 5mh418w9stax2, child number 0
-------------------------------------
select * from dbo where object_type in('VIEW')
Plan hash value: 2675347415
-------------------------------------------
| Id | Operation | Name | E-Rows |
-------------------------------------------
|* 1 | TABLE ACCESS FULL| DBO | 77611 |
-------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("OBJECT_TYPE"='VIEW')
I understand that because the query is accessing large number of blocks which exceeds 6 seconds threshold, the session appears in v$session_longops And this has nothing to do with the time spent in displaying the records on the screen
Now, why the following query does not appear in v$session_longops?
select /*+ full(dbo) */ count(*) from dbo;
select /*+ full(dbo) */ count(*) from dbo;
COUNT(*)
----------
1006525
Elapsed: 00:00:01.36
dv3_erie-dev_08 >select * from table(dbms_xplan.display_CURSOR(null,null,'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
-------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------
SQL_ID 4mgjwp3tv70db, child number 0
-------------------------------------
select /*+ full(dbo) */ count(*) from dbo
Plan hash value: 1423969929
--------------------------------------------
| Id | Operation | Name | E-Rows |
--------------------------------------------
| 1 | SORT AGGREGATE | | 1 |
| 2 | TABLE ACCESS FULL| DBO | 1007K|
--------------------------------------------
The table has all nullable columns and thus I assume the index on ID can't be used for this COUNT Thus ideally it shall be accessing same number of blocks and thus shall appear in v$session_longops
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May 16, 2013
How to set commit_write parameter to 'BATCH' in another session.
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Jan 12, 2011
How to enable tracing for sessions connected using shared servers ?
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Jun 13, 2012
I've been searching the web for examples of how to run a trace.It's needed for a session different then current in trace LEVEL 4 (I need the bind variables values in the trace).
Unfortunately, I couldn't trace with DBMS_SUPPORT.START_TRACE_IN_SESSION, I understand that this is because it was only introduced in Oracle 11g.
how can i trace a session in level 4 on Oracle 10g for another session?
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Feb 22, 2012
At my prod instance one sql query ran for about 9 hours.Now the sql query completed with success.Suddenly our ops team want to know the which sql query was running for 9 hours.As the query got success no record is being found at session level.
I know the SID.How Do I get the SQL query ?
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Mar 28, 2013
How can I find out the particular oracle session which was consuming high memory in the past?
I can't get the data in v$sessstat
Unable to get the information in AWR
dba_hist_active_session_history do not have field which indicate memory related information
Shall I concetrate on EVENT in dba_hist_active_session_history which continuosly had sort, direct path read
Or
Locate sql_id from dba_hist_sqlstat with high SORTS_DELTA for snapshots belonging to problematic time period and then using the sql_id query dba_hist_active_session_history
which approach I shall take to find out the session which consumed most memory in the past?
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Nov 16, 2011
I executed a query which executed quickly (1.7 seconds) but since its output took time in displaying on the console the time shown by 'set timing on was 39.5 seconds
also I took trace (tkprof) for the same.My query is why the timings under 'Total Waited' (43.19 and 1.69) are not added to the elapsed time 1.83 seconds
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.06 0 10 0 0
Fetch 758 0.03 1.77 0 0 0 11345
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 760 0.03 1.83 0 10 0 11345
[code]....
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Jul 12, 2010
Looking to understand the difference between instance tuning and database tuning.
What is the difference between these two tuning exercises? I understand that an instance is memory based structures (logical) where as database consists of physical structures.
However, how does one tune a database the physical structure? Does it have to do with file placements/block sizes etc. Would you agree that a lot of that is taken care by ASM now in 11g? What tools are required/available (third party as well as oracle supplied) for these types of tuning scenarios?
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Oct 31, 2011
I have two tables with 113M records in DWH_BILL_DET & 103M in prd_rerate_chg_que and Im running following merge query, which is running for 13 hrs to update records, which is quiet longer time.
SQL> explain plan for MERGE /*+ parallel (rq, 16) */
INTO DWH_BILL_DET rq
USING (SELECT rated_que_rowid,
detail_rerate_flag_code,
rerate_sel_key,
[code].....
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Sep 30, 2010
How the length of column width effects index performance?
For example if i had IOT table emp_iot with columns:
(id number,
job varchar2(20),
time date,
plan number)
Table key consist of(id, job, time)
Column JOB has fixed list of distinct values ('ANALYST', 'NIGHT_WORKED', etc...).
What performance increase i could expect if in column "job" i would store not names but concrete numbers identifying job names.
For e.g. i would store "1" instead 'ANALYST' and "2" instead 'NIGHT_WORKED'.
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Jun 16, 2010
I have a question about database fragmentation.I know that fragmentation can reduce performance in query times. The blocks are distributed in many extents and scans process takes a long time. Oracle engine have to locate the address of the next extent..
I want to know if there is any system view in which you can check if your table or index has high fragmentation. If it's needed I will have to re-create, move or rebulid the table or index, but before I want to know if the degree of fragmentation is high.
Any useful script or query to do this, any interesting oracle system view?
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Oct 20, 2010
There is a simple way to increase the performance of a query by reducing the row-size of the table it hits. I used it in the past by dividing the table into smaller parts and querying respective smaller table in each query.
what is this method called ? just forgot the method and can't recall it. what this type of row-reduction optimization is called ?
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Jun 16, 2011
How many records could I have in a single table without performance degradation with Standard Edition without partitioning with cutting-edge server (8 or 12 cores, 72 GB RAM, FC 4 Gbit, etc...) and good storage?
300 Millions in only one table with 500K transactions / day is too much?
Simple database with simple schema.
How many records begin to be too many?
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Nov 15, 2010
Testing our 9i to 11g upgrade, we've imported the entire DB into the new machine.We've found that certain procedures are really suffering performance problems. BUT, we've also found, that if we check out a production copy of the procedure from our source code control, and reinstall it, the performance issue goes away. Just alter the procedure and recompiling does NOT work.
The new machine where the 11g database exists is slightly different than the source, but it's not like we have this problem with every procedure. It's only a couple.
any possible reason that we'd have to re-install a procedure to correct a performance problem?
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Apr 12, 2013
I need to check the package performance and need to improve the package performance.
1. how to check the package performance(each and every statement in the package)?
2. In the package using the delete statement to delete all records and observed that delete is taking long time to delete all the records in the table(Table records 7000000). This table is like staging table.Daily need to clean the data before inserting the data into it. what can I use instead of Delete.
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Aug 9, 2010
Somewhere I read that we should not use hints in Oracle production environments, but we can use hints in the development environment and on achieving the desired execution plan we can adjust the 'statistics' to follow that plan without hints.
Q1. If it is true what statistics do we adjust for influencing the execution plan and how?
For example, I have the following simple query:
select e.empid, e.ename, d.dname
from emp e, dept d
where e.deptno=d.deptno;
emp.empid, emp.deptno and dep.deptno columns have indexes and the tables have the standard structure as found in the basic oracle examples.
If I look at the execution plan of the above query then I see that the driving table is empand the driven table is dept.Also the type of join that is taking place is 'Nested Loop'.
Questions: With respect to the above query,
Q 2. If I want to make dept the driving table and emp the driven table then how can I adjust the statistics to achieve that?
Q 3. If I want to use hash join instead of a nested loop join then then how can I adjust the statistics to achieve that?
I can put the ordered and the use_hash hint to effect this but again I have heard that altering statistics is a more robust way to control an execution plan as compared to hints.
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Dec 6, 2011
I have an issue with export(expdp).
When i exporting an user using expdp utility, the load the on the server is going up-to 5. The size of the database is 180GB. Below is the command that i use for export.
expdp sys/xxxx directory=dbpdump dumpfile=expdp_trk_backup.dmp logfile=expdp_trk_backup.log exclude=statistics schemas=trk
Do i need any look into any memory parameters for this?
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Oct 17, 2011
The following query gets input parameter from the Front End application, which User queries to get Reports.There are many drop down boxes like LOB, FAMILY, BRAND etc., The user may or may not select values from drop down boxes.
If the user select any one or more values ( against each drop down box) it has to fetch all matching values from DB. If the user does'nt select any values it has to fetch all the records, in this case application will send a value 'DEFAULT' (which is not a value in DB ) so that the DB will fetch all the records.
For getting this I wrote a query like below using DECODE, which colleague suggested that will hamper performance.From the below query all the variables V_ are defined in procedure which gets the values selected by user as a comma separated string here V_SELLOB and LOB_DESC is column in DB.
DECODE (V_SELLOB, 'DEFAULT', V_SELLOB, LOB_DESC) IN
OPEN v_refcursor FOR
SELECT /*+ FULL(a) PARALLEL(a, 5) */
*
FROM items a
WHERE a.sku_status = 'A'
[code]...
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Sep 3, 2010
what the principal things to look at when we have for the same query different performance results are?I have 2 different bases: the plan and data are the same but performance results are very differents.
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Mar 17, 2012
are the most important performance keys we have to calculate or take in account to preserve or to increase the DB performance in terms of response times, and whatsoever according to performance ?
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Oct 21, 2011
understand this stats from the TKPROF. The below stats is for INSERT SELECT statment.
Here what does Disk and Current values refer ?
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 0 0.00 0.00 0 0 0 0
Execute 1 1141.84 1117.85 1829639 517129893 1749 109
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 1 1141.84 1117.85 1829639 517129893 1749 109
[code]...
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May 8, 2013
How do i get tkprof trace file in sqldeveloper tool ? I donot have access sql in command mode.
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