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тАО04-03-2001 03:08 AM
тАО04-03-2001 03:08 AM
OS read buffer size - I/O channel
How do I determine the OS read buffer size on an HPUX system? I have an 8k db_block_size and want to correctly determine the db_multi_block_read_count parameter.
2 REPLIES 2
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тАО04-03-2001 03:30 AM
тАО04-03-2001 03:30 AM
Re: OS read buffer size - I/O channel
If you have an 8k db block size in Oracle then you want to match this with the blocksize of the logical volume.
To find out what it is;
fstyp -v | grep bsize
The normal blocksize for JFS filesystems is 8k anyway.
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тАО04-03-2001 03:31 AM
тАО04-03-2001 03:31 AM
Re: OS read buffer size - I/O channel
Hi Raj,
hfs block size is 8k and jfs is 1k , but may be this is not what you want :
following is topic about db_multi_block_read_count
---------------
It depends on what kind of application (DSS,OLTP) your database is running. Increasing DB_FILE_MULTIBLOCK_READ_COUNT doesnt always increase performance. Other factors like size of tables and whether parallel query is being utilized come into the picture. Unlike db_file_mult_read_cnt which is primarily for I/O performance, DB_BLOCK_SIZE affects other parameters like the maximum value of the 'freelists' storage param for tables and indexes. Increasing db_block_size also requires recreating your whole database with a larger block size. I dont think it's worthwhile to do that just for a small performance increase in I/O. So increasing one or the other is definitely not the same. I would increase the DB_file_mult... if I/O performace was an issue and test the results first.
--------------
this is from oracle metalink
why not start at 16 ?
hfs block size is 8k and jfs is 1k , but may be this is not what you want :
following is topic about db_multi_block_read_count
---------------
It depends on what kind of application (DSS,OLTP) your database is running. Increasing DB_FILE_MULTIBLOCK_READ_COUNT doesnt always increase performance. Other factors like size of tables and whether parallel query is being utilized come into the picture. Unlike db_file_mult_read_cnt which is primarily for I/O performance, DB_BLOCK_SIZE affects other parameters like the maximum value of the 'freelists' storage param for tables and indexes. Increasing db_block_size also requires recreating your whole database with a larger block size. I dont think it's worthwhile to do that just for a small performance increase in I/O. So increasing one or the other is definitely not the same. I would increase the DB_file_mult... if I/O performace was an issue and test the results first.
--------------
this is from oracle metalink
why not start at 16 ?
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