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Operating Systems AIX Asynchronous I/O on AIX and DB performance Post 302515321 by arizah on Tuesday 19th of April 2011 08:11:05 PM
Old 04-19-2011
Hi,

Thanks for your comments once again. I wonder if in this case everytime when we hit the peak in my case we have only 120 AIO servers procesess on this server then any other requests has to sit in the queue and wait for a AIO server to be released/available. If this how it works?. I must admit I'm a bit confuse with the maxreqs parameter. In our enviroment is set to 4096 but I believe this is just a hard limit assuming that the combination of maxservers and the number of CPU's doesn't go beyond this limit.
Code:
│ Asynchronous-I/O-Processes ───────────────────────────────────────────────────────────────────────────────────────────────│
│ Total AIO processes= 120 Actually in use=   0  CPU used=   0.0%    [Use zero                                              │
│       All time peak= 120     Recent peak= 119      Peak=  28.0%     to reset]                                             │
│ Top-Processes-(308) ─────Mode=3  [1=Basic 2=CPU 3=Perf 4=Size 5=I/O 6=Cmds]─────────────

 

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SQL::ReservedWords::DB2(3pm)				User Contributed Perl Documentation			      SQL::ReservedWords::DB2(3pm)

NAME
SQL::ReservedWords::DB2 - Reserved SQL words by DB2 SYNOPSIS
if ( SQL::ReservedWords::DB2->is_reserved( $word ) ) { print "$word is a reserved DB2 word!"; } DESCRIPTION
Determine if words are reserved by DB2. METHODS
is_reserved( $word ) Returns a boolean indicating if $word is reserved by either DB2 5, 6, 7 or 8. is_reserved_by_db2v5( $word ) Returns a boolean indicating if $word is reserved by DB2 5. is_reserved_by_db2v6( $word ) Returns a boolean indicating if $word is reserved by DB2 6. is_reserved_by_db2v7( $word ) Returns a boolean indicating if $word is reserved by DB2 7. is_reserved_by_db2v8( $word ) Returns a boolean indicating if $word is reserved by DB2 8. reserved_by( $word ) Returns a list with DB2 versions that reserves $word. words Returns a list with all reserved words. EXPORTS
Nothing by default. Following subroutines can be exported: is_reserved is_reserved_by_db2v5 is_reserved_by_db2v6 is_reserved_by_db2v7 is_reserved_by_db2v8 reserved_by words SEE ALSO
SQL::ReservedWords <http://www-306.ibm.com/software/data/db2/udb/> AUTHOR
Christian Hansen "chansen@cpan.org" COPYRIGHT
This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2008-03-28 SQL::ReservedWords::DB2(3pm)
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