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 :: Performance Standard Edition Without Partitioning?

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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Performance Tuning :: Oracle10g Standard Edition On Linux Machine

Jan 16, 2012

In my production ENV there is two node RAC database is running , and on both machine RAM size is (35GB on node1,41GB on Node2) and other configuration is like below.

SGA SGA_TARGET DB_BLOCK_SIZE DB_MULTIBLOCK_READ_COUNT
NODE1 16G 14G 8K 16K
NODE2 16G 14G 8K 16K

Our Database size is 700GB approx.

The above SGA configuration is ok or need to be increase the size of SGA , our HIT RATIO is almost 99%.

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Performance Tuning :: How Does Standard Versus Advanced Handle Index Compression

Aug 18, 2010

How does standard vs advanced handle index compression? Is there an advantage to having one vs the other besides the incurred cost?

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Performance Tuning :: Standard SQL Query To Benchmark Oracle DB Response Time?

Oct 26, 2013

I wish to run a SQL query and measure elapsed time, then compare the values to other Oracle DBs from other companies. That will give me a feeling if our DB performs well.For example in UNIX world, you can create a random 4GB file to measure throughput I/O and compare the values (for example 4MB/sec).

What's the simplest way to compare DB response time from forum members to our own DB? I don't need 100% accurate numbers.

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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 :: 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 :: 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 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 :: 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 :: 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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Performance Tuning :: Oracle Documentation On Details Of AWR Report

Jun 4, 2012

A coworker of mine asked if there was any documentation from Oracle that listed all of the parts of the AWR report and what each meant. I was taken back because I don't think there is. There are third party books that talk about AWR reports and their predecessor Statspack reports.

Oracle has some notes on their support site about reading an AWR or Statspack report. All I found in the official documentation was some basic information about how to run an AWR report and an overview of what it was. It would be nice to have some sort of documentation that lists out each section and explains the units and purpose.

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Performance Tuning :: AWR Report Generation For Short Duration

Nov 5, 2012

Is it possible to generate AWR report for the duration of 5 min? As we know that snapshots are generated for every 1 hour, which we specified in parameter.

By changing the parameter to 2 min, what could be the impact on database?

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Performance Tuning :: Application (software / Utility) For Report?

Jul 28, 2010

Now, I'm tired to capture one-by-part image, and realize.

I've not seen any application or utility to make this work easier to me.

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Performance Tuning :: ASH Report - SQL Has Been Executed For 1567 Times?

Sep 12, 2012

In ASH report

there is a section that goes like this

SQL ID Planhashed Sampled # of Executions % ActivityEvent% Event Top Row Source
fdy93qpr1227 1567 7.58direct path read 3.65TABLE ACCESS - FULL

does it suggest that this SQL has been executed for 1567 times is this correct .

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Performance Tuning :: AWR Report Network Foreground Wait Events?

Jun 29, 2011

I ran an AWR report. The database looks fine, but a data load that loaded 1 Million rows an hour is now doing 500K per hour.

Wait Class Waits %Time -outs Total Wait Time (s) Avg wait (ms) %DB time
DB CPU 224 80.70
Other 2,668 0 28 10 9.99
System I/O 4,753 0 9 2 3.23
Administrative 1 0 6 5543 2.00
Commit 357 0 4 11 1.46

[code]....

The network value for wait: 630,601. What does this mean? Anything I should look at? When it was 1million per hour, the value was 4,563,000.

Top 5 Timed Foreground Events

Event Waits Time(s) Avg wait (ms) % DB time Wait Class
DB CPU 224 80.70
unspecified wait event 2,666 28 10 9.99 Other
control file sequential read 4,753 9 2 3.23 System I/O
switch logfile command 1 6 5543 2.00 Administrative
log file sync 357 4 11 1.46 Commit

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Performance Tuning :: Difference Between System / User Sql In Tkprof Report?

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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Performance Tuning :: Top Wait Events - Specific Document To Analyze AWR Report

Jun 24, 2013

We are using 11.2.0.3.0 on solaris 10 facing slow performance, following are the Wait Events in AWR report, Also if any specific document to analyze AWR report and to pin point the performance bottleneck.

Foreground Wait Events
**********************
Avg
%Time Total Wait wait Waits % DB
Event Waits -outs Time (s) (ms) /txn time
-------------------------- ------------ ----- ---------- ------- -------- ------
direct path read 308,729 0 21,191 69 58.0 39.5
db file sequential read 208,754 0 3,742 18 39.2 7.0
cursor: pin S 19,541,899 0 2,561 0 3,668.5 4.8
[code]....

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Application Express :: Changing Row Color Of Standard SQL Report

Feb 2, 2013

change the color of a row in APEX SQL report. Change Colour of Row - Oracle APEX SQL Report...It's a bit outdated, and trying to figure out how to get to this page: URL.....where I can conditionally set background color.

I am using theme 13 (legacy) and made a copy of the report region. Edited it but cannot find an equivalent section of that apex 3.1 screenshot.

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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 :: Merge Statement Tuning For 100M Records In Table?

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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Performance Tuning :: How Length Of Column Width Effects Index Performance

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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Performance Tuning :: Fragmentation Can Reduce Performance In Query Times

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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Performance Tuning :: Method Of Tuning Database - Row Reduction?

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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Performance Tuning :: Procedure Performance On New Database Import?

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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Performance Tuning :: Checking Delete Performance In Package

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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Performance Tuning :: Query Performance Gain Using Statistics?

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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