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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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The space for the queue files will be pre-allocated if this parameter is on.

Otherwise, it will be allocated as the queue fills, and will be deallocated as

the queue empties. Setting this parameter to ON guarantees that Queue

Manager will not run out of space on the disk while it is running and is

recommended for production configurations. Setting this parameter to

OFF allows much more effective use of disk space, and is recommended

for test configurations.

QREADAHEAD <number>

Initial Changed

Version Version Values Default Minimum Maximum Alter

4.090 3 2 100 No

Is the number of blocks the Queue Manager will read ahead when reading

data to send to the Consumer. Each block requires approximately 56K

bytes of memory. Since the Queue Manager typically can read data from

disk faster than the Consumer can apply it, the default value of 3 should

usually be sufficient. Note: each read from disk may translate into many

insert, updates, and deletes at the Consumer.

QSUBVOLUME <subvolume-part>

Initial Changed

Version Version Values Default Value Specifications Alter

4.090 None The subvolume the queue No

files will be placed in.

This is subvolume the Queue Manager will place the queue files in. It is a

required parameter. Note that this is only the subvolume portion of the file

name – the volume and name portions are constructed by the Queue

Manager using the QVOLUMES and QFILEPREFIX parameters.

See QFILEPREFIX for an example of how the full file name is created.

QVOLUMES {volume}

{(volume [,volume...])}

Initial Changed

Version Version Values Default Value Specifications Alter

4.090 None A disk volume or list of No

disk volumes for storing

the queue data.

This parameter is the volume or list of volumes to store the queue data on.

This is a required parameter. Up to 16 disks can be specified.

Note: if possible, the disks should be dedicated to the disk queue to avoid

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HP Integrity NonStop H-Series Guía de usuario Pagina 304