Performance Tuning :: Database Time In AWR Report

Jul 9, 2012

I understand that when data is read from the disk, I/O is done..And When computations are done then CPU is used..Then where the following equation fits?

DB Time = sum of database CPU time + waits

Is I/O considered as a part of CPU time?

Does this equation changes with SAN, OS caching?

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Performance Tuning :: Time Calculation In AWR Report

Dec 12, 2011

Till statspack we had

elapsed time = time spent on waits + time CPU was used

Total time during snaps = Elapsed time + (may be) time waited for CPU...In AWR is it possible to draw such equation? I can see that the AWR report has following elements

1) End Snap time - Begin Snap time
2) DB time - as mentioned at the top of AWR report
3) DB CPU - in "Top 5 Timed Foreground Events" (I assume this is 'CPU used by sesson timing' in statspack)
4) Total of time for all Statistics in "Time Model Statistics"
5) BUSY_TIME + IDLE_TIME - "Operating System Statistics"

Time between 2 snapshots? or what else? Also for which seconds to multiply to 'DB Time(s)' per second and 'DB CPU(s)' per second in Load Profile to get the db time and CPU time?

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Performance Tuning :: Sql Taking More CPU Time?

Nov 23, 2010

I have one query in my production which is taking more CPU time. when that statement executing the CUP is taking more than 90%

I am attaching the sql query and indexes on the table.

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Performance Tuning :: Tools For Database Tuning And Instance Tuning

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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Performance Tuning :: Update XML Eating Up A Lot Of Time

Sep 26, 2012

update xml eating up a lot of time is there any way to tune

'"]', :B1 )

call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 499 0.44 0.90 0 3 0 0
Fetch 499 1.49 2.87 0 0 0 499
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 999 1.93 3.77 0 3 0 499

real code
SELECT updatexml(l_xml,
'_')) || '"]/text()',
INTO l_xml
FROM dual;

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Performance Tuning :: Avg Time Taken By Execution Plan

Apr 12, 2013

How can i check the avg time taken by an execution plan. Actually i have a very big query and it changes its execution plan very often, we would like to lock the best execution plan and to find it , i would like to know the Average Execution Time the query takes when it runs using different different execution plans.

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Performance Tuning :: Loading And Reading At Same Time

Feb 13, 2013

For example, we have a table ACCOUNT (snowflake dimension containing other dimension keys) and I have many fact tables based on this dimension. Normally data warehouse load happens like first dimensions needs to be loaded and then facts. Our frequency of loads is 30 mins.

To increase the rate in which the data will be available in the facts (as its a financial application), am considering to have two batches one with dimension and another one with fact (came to this conclusion as there is no dependency like first dimensions to be loaded then only fact) just the update might get missed sometimes. But if I do that, when dimension gets loaded, it will be read in the facts in another session. Will this affect the performance ?

LOADING (insert/update) and selecting data from table at the same time. Will it affect the performance in any way.

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Performance Tuning :: SQL Ordered By Elapsed Time

Feb 2, 2013

Elapsed Time (s)CPU Time (s)Executions Elap per Exec (s) % Total DB TimeSQL IdSQL ModuleSQL Text

3,263 32 1 3263.49 2.79 3ta0ms19fvgds httpd.exe SELECT CASE WHEN COUNT >= 1...Elapsed
6,360 164 2 3180.17 5.44 51jx99dm0swv7 cpm_srvscript@ahcaxasmil1b (TNS V1-V3) SELECT /*+ CCL<PFT_GET_RP...

On AWR, I see two script that are out of ordinary, and I want to make sure that I interpret them correctly.

1) "Elap per Exec (s)" shows 3263.49 with 1 "Executions".
2) "Elap per Exec (s)" shows 3180.17 each execution with 2 "Executions".

Does this mean that this script ran for ~ 54 minutes (3263.49 / 60 seconds) for 1 "Execution" and ~ 53 minutes (3180.17 / 60 seconds) per each execution? I need to understand "Elapsed Time (s),CPU Time (s),Executions ,Elap per Exec (s), % Total DB Time" represent.

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Performance Tuning :: Lot Of Time Being Taken To Delete Data From A Table

Apr 27, 2012

I have a table which contains 8,21,177 amount of data totally.Now I am trying to delete around 4,84,000 of data from this table by using just one filter i.e. my query is something like below

DELETE /*+ parallel(resource,4) */ FROM resource where created_by = 'MIGN'

This is going to delete 4,84,000 rows of data . But my current issue is this is taking lots of time to delete the data . To be precise , its almost taking 25 hours to delete this data..The created_by column is indexed .

Execution Plan
Plan hash value: 2389236532

| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time

| 0 | DELETE STATEMENT | | 499 | 20459 | 39 (0)| 00:00:
01 |

| 1 | DELETE | RESOURCE | | | |

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Performance Tuning :: Lost Index From Second Execution Time?

Jul 11, 2013

The problem was describe:

- First time to execute: Using all indexes on 2 tables

- Second time to execute: Using only indexes on first table, full table scan on the other

- Third time to execute: Do FTS on both of tables.

Now, I show the objects and relate information here:

The Tables:

system@dbwap> select count(*) from my_wap.news_relation;


system@dbwap> select count(*) from my_wap.news_content;


system@dbwap> desc my_wap.news_content;
Name Null? Type
----------------------------------------------------- -------- ----------------


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Performance Tuning :: Max And Delete Statement Talking Lot Of Time?

Apr 15, 2011

Test1 table have around 385772300 rows. below delete and select statment talking lot of time.

Select stament taking more than 1 hrs.

FROM Test1 f;

delete statment taking more than 2 hours



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Performance Tuning :: Snapshot Skipped In Between Scheduled Time?

Sep 11, 2013

Yesterday, there were performance issue at server. So today, when i am generating report for that particular period, found snapshot id sequence is serially but with skipped hourly timed. Instead of generating report at 15:30, it generated at 16:30.

Enter value for num_days: 2

Listing the last 2 days of Completed Snapshots
Instance DB Name Snap Id Snap Started Level
------------ ------------ --------- ------------------ -----
tagidev TAGIDEV 2857 10 Sep 2013 00:30 1
2858 10 Sep 2013 01:30 1
2859 10 Sep 2013 02:30 1
2860 10 Sep 2013 03:30 1
2861 10 Sep 2013 04:30 1
2862 10 Sep 2013 05:31 1


Below are the details at alert log -

Tue Sep 10 14:28:20 2013
Thread 1 cannot allocate new log, sequence 7029
Checkpoint not complete
Current log# 2 seq# 7028 mem# 0: E:APPORACLEORADATATAGIDEVREDO02.LOG
Thread 1 advanced to log sequence 7029 (LGWR switch)


1) why snap didn't started at 15:30?

2) since database just started at the scheduled time of AWR snap time. But generated at 16:32 instead of 16:30, though last services "SMCO" is started at 16:42. How it snap id generated for this particular time?

3) what does "kewastUnPackStats(): bad magic 1 (0x000000001B3CE48D, 0)" mean?

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Performance Tuning :: How To Reduce Index Creation Time

Aug 17, 2010

Is there any way to reduce the index creation time. I have one table which has 7700000 records and every day this table get truncate and we create with create table as select statement and then create the 4 indexes and each index took 5 minutes so in totality it took 20 minutes in index creation.

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Performance Tuning :: Why Different Elapsed Time In Oracle9i And 10g For Same Query

May 5, 2011

why different elapsed time in Oracle9i and oracle10g for the same query ?

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Performance Tuning :: SQL Ordered By Elapsed Time And SQL Module?

Feb 24, 2013

Elapsed Time (s) CPU Time (s) Executions Elap per Exec (s) % Total DB Time SQL Id SQL Module SQL Text
2,423 1 3,919 0.62 1.83 gt49gg0fnc5x8 srv_dr@ahs (TNS V1-V3) UPDATE /*+ CCL<OENDB_FILE...
2,227 14 1 2227.16 1.68 bggfx8a04prj9 SQL*Plus select * from (select n.source...

On [SQL ordered by Elapsed Time], [SQL Module] shows an indication that a SQL was executed by which process (i.e. srv_dr@ahs)outside of SQL*PLUS.If [SQL Modeule] shows as [SQL*Plus], does it mean the query was run in SQL*PLUS manually or directly?I have the SQL ID. How do I find out who, how, and exactly what time it was run?

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Performance Tuning :: WINDOW SORT - Reduce Time?

Nov 30, 2011

In my insert query, Window sort takes longer time i.e. 93% of total execution time, How do i reduce this time? are there any tuning parameters availabe for this?

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Performance Tuning :: AWR Report Evaluation

May 20, 2010

My DB is oracle10g.

I have AWR report comparison for two different days. I want to find the below things.

1. Which day has better performance?
2. What are the top two findings on the report.

I attached the report.

Here are my answer. Please correct me if i am wrong.

1. Which day has better performance? Second day has higher load. Since redosize is showing very high.
2. What are the top two findings on the report.

a) Compared to two days, first day, little bit more I/0 wait for single block read.
b) Compared to two days, 2nd day, it takes higher CPU.

However, which day is best compared to two days?

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Performance Tuning :: No Snapshot Available For AWR Report

Feb 1, 2011

I am trying to generate AWR report for database observation. But I am not getting any snapshot listed there. below is the output of my awrrpt.sql

SQL> @?/rdbms/admin/awrrpt.sql

Current Instance
DB Id DB Name Inst Num Instance
----------- ------------ -------- ------------
1140984076 AFCCV 1 afccv

Specify the Report Type
Would you like an HTML report, or a plain text report?

Enter 'html' for an HTML report, or 'text' for plain text Defaults to 'html'

Enter value for report_type: html

Type Specified: html

Instances in this Workload Repository schema
DB Id Inst Num DB Name Instance Host
------------ -------- ------------ ------------ ------------
* 1140984076 1 AFCCV afccv SERVICEDB1

Using 1140984076 for database Id
Using 1 for instance number

Specify the number of days of snapshots to choose from
Entering the number of days (n) will result in the most recent (n) days of snapshots being listed. Pressing <return> without specifying a number lists all completed snapshots.

Enter value for num_days: 3

Listing the last 3 days of Completed Snapshots

Specify the Begin and End Snapshot Ids
Enter value for begin_snap:

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Performance Tuning :: Get AWR Report Data?

Aug 8, 2012

I am having only select_catalog_role in database. Can I take complete AWR report data from awr views without using DBMS_WORKLOAD_REPOSITORY package?

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Performance Tuning :: Delete Statement Is Taking More Time For Execution?

Mar 9, 2010

In my code I am using delete statement which is taking too much time to execute.

Statement is as follow:


Tables Used:
oTRADE_ORDER_EMP_ALLOCATION Row count (329525880)
oLOAD_TRADE_ORDER Row count (29281)

Every column in "IN" clause and select clause is containing index on it

Every time no of rows which to be deleted is vary (May be in hundred ,thousand or hundred thousand )so that I am Unable to use "BITMAP" index on the table "LOAD_TRADE_ORDER" column "IND_IS_BAD_RECORD" though it is containing distinct record in it.

Even table "TRADE_ORDER_EMP_ALLOCATION" is containing "RANGE" PARTITION over it on the column "ARTEMIS_SOURCE_SYSTEM_ID". With this I am enclosing table scripts with Indexes and Partitions over it.

way for fast execution in of above delete statement?

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Performance Tuning :: Query Running For A Long Time In Second Schema

Apr 27, 2012

I have a Query(report) which is running in <5 mins in one Scheme, where as the same is running for a long time in second schema. I have identified that an Index is scanning for more than 2000 Millions of records in second Schema, but this is scanning only 440 Millions in First Schema and hence it is fast. I am expecting the same to be done in Second schema.

I have verified the following
All records in tables in 2 schemas are same.
All indexes are same
Analyzed the tables
Gathered Histogram on all the columns as per the first schema.

But now i still have the same problem, don't know what could be the problem.


Also attached 2 screen shots of OEM Plans..

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Performance Tuning :: Elapsed Time Not Accounted In Tkprof File

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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Performance Tuning :: Elapsed Time In Trace File Output

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

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Performance Tuning :: How To Find Out Queries That Are Executed In Particular Range Of Time

Sep 9, 2011

here we have an scenario where we want to find out all the sql statements that are executed in a particular time. The sql statements are executed via our application. I tried in awr report but it shows only the sql query which has taken long time to execute. and i even tried in V$session and V$sqlarea. how to view the executed sql statements in a particular session/current session

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Performance Tuning :: Cost Of Query Is Brought Down But Taking Same Time

Sep 1, 2010

For an query, cost was 16Lakhs and was taking 30min, I brought down the cost to 1.5lakhs, but still it is taking 30min.

There were many outer joins and same table has been Used(FROM clause) 5 times in the query. I have introduced WITH clause, and brought down the cost.

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Performance Tuning :: Generate HTML AWR Report?

Jan 10, 2012

I would like to generate HTML awr report and save it to my local machine.

After running $ORACLE_HOME/rdbms/admin/awrrpt.sql in sqlplus and specifying HTML in (Enter value for report_type: HTML) i hvae get numerous html code in my sqlplus prompt.. I want to save the html report in local machine and open it by double clicking on it.. it will be opened in a browser..

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Performance Tuning :: AWR Report In 11g Standard Not Supported?

Jan 15, 2011

I was trying to generate AWR report, but the report which got generated consist most of the sections without data. Later i came to know that AWR report is not fully supported in 11g? Is that true?

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Performance Tuning :: AWR Report For Specific Date

Jun 4, 2010

I want to take AWR report at specific date ex(25-05-2010).

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Performance Tuning :: How To Read And Understand AWR Report

Sep 9, 2011

One of my procedure recently taking very long time to execute. I'm attaching AWR report. But I don't know how to read and understand this.

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Performance Tuning :: AWR Report - Find Disk I/O

Mar 11, 2012

In AWR report, in order to find the disk i/o, Should I see the avg read(ms) under Tablespace I/O and Filesystem I/O columns?

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