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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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DB2_TABLES(3)								 1							     DB2_TABLES(3)

db2_tables - Returns a result set listing the tables and associated metadata in a database

SYNOPSIS
resource db2_tables (resource $connection, [string $qualifier], [string $schema], [string $table-name], [string $table-type]) DESCRIPTION
Returns a result set listing the tables and associated metadata in a database. PARAMETERS
o $connection - A valid connection to an IBM DB2, Cloudscape, or Apache Derby database. o $qualifier - A qualifier for DB2 databases running on OS/390 or z/OS servers. For other databases, pass NULL or an empty string. o $schema - The schema which contains the tables. This parameter accepts a search pattern containing _ and % as wildcards. o $table-name - The name of the table. This parameter accepts a search pattern containing _ and % as wildcards. o $table-type - A list of comma-delimited table type identifiers. To match all table types, pass NULL or an empty string. Valid table type iden- tifiers include: ALIAS, HIERARCHY TABLE, INOPERATIVE VIEW, NICKNAME, MATERIALIZED QUERY TABLE, SYSTEM TABLE, TABLE, TYPED TABLE, TYPED VIEW, and VIEW. RETURN VALUES
Returns a statement resource with a result set containing rows describing the tables that match the specified parameters. The rows are composed of the following columns: +------------+---------------------------------------------------+ |Column name | | | | | | | Description | | | | +------------+---------------------------------------------------+ | TABLE_CAT | | | | | | | The catalog that contains the table. The value is | | | NULL if this table does not have catalogs. | | | | |TABLE_SCHEM | | | | | | | Name of the schema that contains the table. | | | | |TABLE_NAME | | | | | | | Name of the table. | | | | |TABLE_TYPE | | | | | | | Table type identifier for the table. | | | | | REMARKS | | | | | | | Description of the table. | | | | +------------+---------------------------------------------------+ SEE ALSO
db2_column_privileges(3), db2_columns(3), db2_foreign_keys(3), db2_primary_keys(3), db2_procedure_columns(3), db2_procedures(3), db2_spe- cial_columns(3), db2_statistics(3), db2_table_privileges(3). PHP Documentation Group DB2_TABLES(3)
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