Re: IO Details || ORCL
- From: Mladen Gogala <gogala.mladen@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Sat, 15 Jul 2023 01:21:19 -0400
On 7/14/23 23:34, Krishnaprasad Yadav wrote:
How to calculate read response time for a single block and for
multiple blocks for an oracle database ?
i tried certain research from different website , we see only metric
is about : 'Average Synchronous Single-Block Read Latency' , i
can't get any further details , Are Average Synchronous Single-Block
Read Latency can be used to calculate the IO-throughput from database .
SLOB can help you with that. SLOB is an abbreviation for "Silly Little
Oracle Benchmark" and was written by Kevin Closson, The software can be
downloaded from GitHub. My favorite starting point for all things SLOB
is:
https://kevinclosson.net/slob/
If you don't want to include database in measuring the IO
characteristics of your system, you can also use things like fio or
bonnie++. Those programs are benchmark which measure IO performance.
Especially fio has many options to emulate Oracle I/O (direct I/O) and
is a great tool.
Oracle has DBMS_RESOURCE_MANAGER.CALIBRATE_IO. However, the results
aren't repeatable which makes it somewhat questionable as a benchmark.
You can even update SYS.RESOURCE_IO_CALIBRATE$ manually. That's what
SLOB is for. There was even a bug with DBMS_STATS failing because of row
lock contention in RESOURCE_IO_CALIBRATE$ and Oracle Support directed
people to truncate this table manually.
--
Mladen Gogala
Database Consultant
Tel: (347) 321-1217
https://dbwhisperer.wordpress.com
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