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HP NonStop Shadowbase Command Definitions

Queue Manager Command Descriptions

HP NonStop Shadowbase Command Reference Manual—785421-002

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This parameter specifies whether buffered I/O is used when writing to the

queue files. If set ON, the writes are buffered in the disk cache. If set off,

the write-thru-cache option is used to write the data to the disk. Tests have

shown that higher throughput is attained using buffered I/O, however,

since the QMGR is continuously writing at the end of the file, each write

requires new disk cache. If the disk is dedicated to the queue file storage,

buffered I/O is recommended. If the disk is used for other purposes,

buffered I/O may impact the performance of the other applications by

using up the disk cache.

QFILEEXTENT (prirmay_extent, secondary-extent, maximum exts)

Initial Changed

Version Version Values Default Value Specifications Alter

4.090 4000,400,128 2,2,16 - 65535,65535,959 No

This parameter defines the extent size that will be used by the Queue

Manager when creating its data files for the queue. The default extent

size is (400, 400,128). That is, the primary extent size is 400 pages, the

secondary extent size is 400 pages, and the maximum number of extents

allocated is 128. The valid range for the primary extent and secondary is

2 through 65535. The valid range for the maximum extents is 16 through

959. The minimum size of the file is 57,344 bytes.

QFILESPERVOLUME number

Initial Changed

Version Version Values Default Minimum Maximum Alter

4.090 3 1 100 No

Is the number of files the Queue Manager will create on each volume

specified by the QVOLUMES parameter. The total number of files created

by the Queue Manager is the number of volumes specified in QVOLUMES

times the QFILESPERVOLUME. The default is to create three per volume.

There must be at least two queue files configured – either the

QFILESPERVOLUME must be 2 or greater or there must be two volumes

configured.

QFILEPREFIX filename_prefix

Initial Changed

Version Version Values Default Value Specifications Alter

4.090 None A two character prefix No

for the queue file names.

This is a required parameter. It is the two character prefix for the queue

filenames. Queue filenames are built from the volume name (specified by

the QVOLUMES parameter), the subvolume name (specified by the

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