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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Administrator's ReferenceThe HCL OneDB™ Administrator's Reference includes comprehensive descriptions of HCL OneDB™ configuration parameters, the system-monitoring interface (SMI) tables in the sysmaster database, the syntax of database server utilities such as onmode and onstat, logical-log records, disk structures, event alarms, and unnumbered error messages.
Configuring and monitoring HCL OneDB™
Database configuration parametersThe HCL OneDB™ database server uses a configuration file, which is called the onconfig file, during initialization. This file contains default configuration parameter values. You can modify the parameter values to improve performance and other characteristics of the instance or database.
DBSPACETEMP configuration parameterUse the DBSPACETEMP configuration parameter to specify a list of dbspaces that the database server uses to globally manage the storage of temporary tables.
Use Hash Join Overflow and DBSPACETEMPHCL OneDB™ uses an operating-system directory or file to direct any overflow that results from certain database operations, if you do not set the DBSPACETEMP environment variable or DBSPACETEMP configuration parameter.

Use Hash Join Overflow and DBSPACETEMP

HCL OneDB™ uses an operating-system directory or file to direct any overflow that results from certain database operations, if you do not set the DBSPACETEMP environment variable or DBSPACETEMP configuration parameter.

You can specify the operating-system directory or file in the following ways:

SELECT statement with GROUP BY clause
SELECT statement with ORDER BY clause
Hash-join operation
Nested-loop join operation
Index builds

Location of the sort overflow files

The following table lists the environment variables and ONCONFIG configuration parameters that you can use to specify the location of the sort overflow files.

Table 1. Location of sort overflow files
Variable or Parameter	Location of the sort overflow files
PSORT_DBTEMP environment variable	The location specified in the environment variable
DBSPACETEMP environment variable	The location specified in the environment variable
DBSPACETEMP configuration parameter specified in the ONCONFIG file	The dbspace that is specified in the ONCONFIG file DBSPACETEMP configuration parameter

If more than one variable or parameter is specified, the priority by which the HCL OneDB determines the location of the sort overflow files is:

PSORT_DBTEMP environment variable
DBSPACETEMP environment variable
DBSPACETEMP ONCONFIG variable
DUMPDIR
$ONEDB_HOME/tmp

If the environment variables or configuration parameter are not set, the sort overflow files are placed in the $ONEDB_HOME/tmp directory and the temporary tables are placed in the rootdbspace.

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