HP Integrity NonStop H-Series Podręcznik Użytkownika Pobierz pdf (Strona 303)

HP NonStop Shadowbase Command Definitions

Queue Manager Command Descriptions

HP NonStop Shadowbase Command Reference Manual—785421-002

294

Initial Changed

Version Version Values Default Minimum Maximum Alter

4.090 40 0 32767 No

This is the number of messages the Queue Manager can receive from the

Collector prior to flushing data to disk and saving the restart file

information. If QFLUSHLIMIT is set to 0, message-counted flushing is

disabled.

Note that there are other events which may cause the data to be flushed

to disk and the restart file written. This also occurs if the flush delay

(number of seconds between flushing) specified by QFLUSHDELAY is

exceeded. Flushing also occurs whenever a file is filled, becomes

available because the Consumer’s restart point has moved beyond the

end of the file, or when the Queue Manager is shutdown.

More frequent flushing will mean less data to be resent on startup at the

expense of additional I/Os to the disk.

QMSGCACHESIZE <number>

Initial Changed

Version Version Values Default Minimum Maximum Alter

4.090 500 3 32767 No

Is the number of messages from the Collector that Queue Manager keeps

in memory in its internal cache. When the Consumer is ready to accept a

message from the Queue Manager, the Queue Manager will check its

internal cache to see if the next message is there. If it is, the message can

be sent without reading from disk. Ideally, this parameter should be set

high enough to allow most messages to be sent without re-reading. Each

message requires approximately 30,000 bytes of memory.

STATS QMGR can be used to help tune this parameter. It provides usage

information on the average number of messages waiting in cache, the

maximum used, and the percent cache hits. These statistics can be used

to help you achieve the optimum balance between memory usage and

performance.

QPREALLOCATE {ON}

{OFF}

Initial Changed

Version Version Values Default Minimum Maximum Alter

4.090 ON OFF ON No

1 2 ... 298 299 300 301 302 303 304 305 306 307 308 ... 345 346

Brak uwag

HP Integrity NonStop H-Series Podręcznik Użytkownika Strona 303