Home
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.
HDR_TXN_SCOPE configuration parameterThe HDR_TXN_SCOPE configuration parameter is used with the DRINTERVAL configuration parameter to specify the synchronization mode for HDR replication in a high-availability cluster.

HDR_TXN_SCOPE configuration parameter

The HDR_TXN_SCOPE configuration parameter is used with the DRINTERVAL configuration parameter to specify the synchronization mode for HDR replication in a high-availability cluster.

onconfig.std value

HDR_TXN_SCOPE NEAR_SYNC

values

FULL_SYNC = HDR replication if fully synchronous. Transactions require acknowledgement of completion on the HDR secondary server before they can complete.

NEAR_SYNC = HDR replication if nearly synchronous. Transactions require acknowledgement of being received on the HDR secondary server before they can complete. If used with unbuffered logging, SYNC mode, which is turned on when DRINTERVAL is set to -1, is the same as nearly synchronous mode.

ASYNC = HDR replication if fully asynchronous. Transactions do not require acknowledgement of being received or completed on the HDR secondary server before they can complete.

takes effect

After you edit your onconfig file and restart the database server.

When you reset the value dynamically in your onconfig file by running the onmode -wf command.

When you reset the value in memory by running the onmode -wm command.

After you run the SQL administration API task() or admin() function with the "onmode","-wf HDR_TXN_SCOPE=value" or

"onmode","-wm
HDR_TXN_SCOPE=value"

argument.

Usage

When the DRINTERVAL configuration parameter is set to 0, the value of the HDR_TXN_SCOPE parameter determines the synchronization mode for HDR replication.

If unbuffered logging is used, HDR SYNC mode is the same as the nearly synchronous mode that is set through the HDR_TXN_SCOPE configuration parameter.

Table 1. Matrix of DRINTERVAL, HDR_TXN_SCOPE, and logging settings, and their resulting HDR replication modes.
DRINTERVAL	HDR_TXN_SCOPE	Logging	Result
-1	n/a	buffered	Asynchronous replication
-1	n/a	unbuffered	Nearly synchronous replication
0	FULL_SYNC	buffered	Fully synchronous replication
0	FULL_SYNC	unbuffered	Fully synchronous replication
0	ASYNC	buffered	Asynchronous replication
0	ASYNC	unbuffered	Asynchronous replication
0	NEAR_SYNC	buffered	Nearly synchronous replication
0	NEAR_SYNC	unbuffered	Nearly synchronous replication
positive integer	n/a	buffered	Asynchronous replication
positive integer	n/a	unbuffered	Asynchronous replication

Have feedback?
Google Analytics is used to store comments and ratings. To provide a comment or rating for a topic, click Accept All Cookies or Allow All in Cookie Preferences in the footer of this page.