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Storage vendors offer endless amounts of performance data on their products, but the information doesn't necessarily reflect how the storage will perform when it is used by an Oracle database. This article outlines some easy ways to test the performance of your storage systems, including some utilities provided by Oracle.
Remember, the Oracle utilities use a simulated load to mimic the type of operations performed by an Oracle database. There is no guarantee your applications will be able to achieve the level of performance they produce.
For a quick and dirty test of your disk performance, you can time writes performed by the
This is no reflection of how disk performance will look when being accessed by Oracle systems.
ORION (ORacle IO Numbers) mimics the type of I/O performed by Oracle databases, which allows you to measure I/O performance for storage systems without actually installing Oracle. It used to be available to download for a number of platforms from OTN, but that download is no longer available. Instead, it is included in the '$ORACLE_HOME/bin' directory of Grid Infrastructure (GI) and database installations.
The usage information is displayed with the following command.
To run the test you need to know the LUNs you will be using for Oracle. In this case I am running it on a little VM, so I'm just going to fake the LUNs using the ext3 filesystem.
Next, create a file to hold the LUN configuration. In this case I will call my test 'ob-test', so my LUN configuration file must be called 'ob-test.lun'. It is assumed it is present in the current directory. The file should contain a list of the luns used in the test.
If you don't specify a test name, the utility assumes the test is called 'orion' and looks for the presence of the 'orion.lun' file.
Next we run a test. I'm going to do a full grid of tests, comparing the performance of a range of small I/O operations (8K) against a range of large I/O operations (1M). Doing the run using the 'normal' option can take a long time, so you may want to try using the 'basic' option first.
On completion of the test, the directory with the ORION executable will contain several new files containing information about the IOPS, MBPS and latency gathered for each test. Here are the files produced by this run.
Obviously, the parameters you use for your runs will have to be tailored to reflect your setup.
Remember, no simulation is ever perfect, but the results give you an idea of what your storage system is capable of delivering.
Introduced in Oracle Database 11g Release 1, the
CALIBRATE_IO procedure gives an idea of the capabilities of the storage system from within Oracle. There are a few restrictions associated with the procedure.
- The procedure must be called by a user with the SYSDBA priviledge.
TIMED_STATISTICSmust be set to TRUE, which is the default when
STATISTICS_LEVELis set to TYPICAL.
- Datafiles must be accessed using asynchronous I/O. This is the default when ASM is used.
You can check your current asynchronous I/O setting for your datafiles using the following query.
To turn on asynchronous I/O, issue the following command and restart the database.
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Ms powerpoint 2007 is provided by. Provided your storage supports asynchronous I/O, the ASYNC_IO flag should now have changed.
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You can now call the procedure by running the following code.
In addition to appearing on screen, the results of a calibration run can be displayed using the
Calibration runs can be monitored using the
Oracle Asm Speed Test
In addition to the methods shown above, it is worth taking a look at the SLOB utility by Kevin Closson.
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For more information see.
Hope this helps. Regards Tim..