Redistributing Files - IBM Cognos User Manual

v Sort buffer size
v Maximum number of transactions per commit (Windows only)
v Ulimit (UNIX/Linux only)

Redistributing Files

You can globally change various file location settings by means of a preference file,
to place your files on servers with sufficient space to handle your production
requirements.
You can also specify preference settings on the command line. These settings
override or take precedence over all other settings, including environment settings
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IBM Cognos Transformer Version 10.1.1: User Guide
On UNIX or Linux servers, the default value for this setting is 32768 (32 MB).
You can double the value to 65536 (64 MB) or triple it to 98304 (96 MB) to
optimize larger UNIX or Linux systems.
To modify the WriteCacheSize setting, open the ppds_cfg.xml.sample file located
in the installation_location/configuration directory. After you change the
WriteCacheSize setting, save the file in the same directory as ppds_cfg.xml.
The sort buffer size used for local processing is specified as a preference setting
on Windows and UNIX/Linux. The default is 8000000; however, you can raise
the amount of physical memory available for sorting data during the
consolidation and auto-partitioning process.
– On Windows, specify this setting using the Work file sort buffer size
preference on the Files tab of the Preferences dialog box, or the
WorkFileSortBufferSize preference in the cogtr.xml file.
– On UNIX/Linux, set the sort buffer size using the WorkFileSortSize
preference in the cogtr.xml file.
Note: This preference applies only when the Cognos Transformer Version 8.4
sort method is used (WorkFileSortMethodis set to 0). This preference does not
apply when the Cognos Transformer Version 10.1.0 sort method is used
(WorkFileSortMethodis set to 1).
This setting limits the number of records that can be processed in temporary
files before a checkpoint is inserted and records are committed to the
PowerCube. To reduce cube build time, try raising the setting from its default
(500000) to 800000. Or, if you get error message TR0112 during a cube build,
lower the setting so records are committed more frequently, thereby freeing up
space.
You change this setting using the Maximum number of transactions per commit
preference on the General tab of the Preferences property sheet, or the
MaxTransactionNum preference in the cogtr.xml file.
Typically, you specify a value for this setting, such as 67 MB for a 2 GB-capacity
server, so that system resources get shared effectively among competing
processes. However, when operating Cognos Transformer on HP-UX, set this
environment variable to unlimited to provide the cube build process with as
much physical memory as possible. For other UNIX platforms or Linux, consult
your operating system documentation to learn how you can best tune your
kernel settings to allocate sufficient memory for Cognos Transformer.
Note: To specify this setting, type the command ulimit -a to determine the
currently assigned values for Cognos Transformer. The time, file, and memory
settings should show a value of unlimited.