These parameters control system-related SharePlex properties.

SP_SYS_HOST_NAME

This parameter is for use in environments where one SharePlex variable-data directory is shared among multiple nodes, such as clusters and systems with alternate network interfaces. It provides SharePlex the correct logical host name (global cluster package name) when any of its processes issues a name lookup, superseding the local system name. The name set with this parameter enables SharePlex to migrate properly during failover.

  • Set SP_SYS_HOST_NAME on the primary node and all secondary (adoptive) nodes before you activate the configuration, and configure it into the package that fails over.
  • Set this parameter in the .profiles file on Unix and Linux systems and in the Windows Registry on

    Windows systems.

  • On Unix and Linux systems, set this parameter through sp_ctrl in the shared variable-data directory. Setting SP_SYS_HOST_NAME through sp_ctrl sets it permanently in the variable-data directory, which is part of the failover, and it ensures that the package name exports before sp_cop starts when you are ready to begin replication.
  • Set SP_SYS_HOST_NAME only on machines within the cluster.

When you issue sp_ctrl commands from a system affecting a clustered machine, use the name set with SP_SYS_HOST_NAME as the host in the [onhost] option, or set it as the default for sp_ctrl by using the host command.

For more information about how to set up SharePlex on clustered systems, see the SharePlex Installation and Setup Guide.

 

Default: none

Range of valid values: the character string of the package name

Takes effect: when SharePlex is restarted

 

SP_SYS_IN_SYNC

This parameter controls the way that SharePlex replicates tables that have key columns where a NULL value is allowed.

  • When this parameter is set to the default of 0 (off), SharePlex uses the key to locate rows on the target system, whether or not any of those columns contain NULLs. This can cause an out-of-sync condition for UPDATEs and DELETEs if the key for a row contains NULLs. The row’s uniqueness cannot be assured, and it is possible for SharePlex to change the wrong row on the target system.
  • When this parameter is set to 1 (on), it directs SharePlex to use the key, but only if there are no NULLs in the row’s key. If the key contains a NULL value, SharePlex uses all of the columns in the row as a simulated key to ensure that it locates the correct target row.

If you know that the keys in your application will never contain NULLs (although NULLs were declared), leave this parameter off, because it incurs more overhead with the added logic that it uses. Set this parameter on the source system, and set it before you activate the configuration.

 

Default: 0 (off)

Range of valid values: 0 or 1 (flag)

Takes effect: when Capture and Read are restarted

SP_SYS_JOB_HISTORY_RETENTION

This parameter defines how many days information about past compare, compare using, repair, copy or append jobs will be kept for the job status and/or report commands to display.

 

Default: 90 days

Range of valid values: 0 or any positive integer

Takes effect: immediately

SP_SYS_JOB_HISTORY_SIZE

This parameter controls the size of the jobs status database, which resides in the data sub-directory of the SharePlex variable-data directory. The value specified determines the maximum size in kilobytes (kB) allowed for the database. When the database size exceeds the value specified, entries are deleted, oldest first. The default value is 0, specifying unlimited.

 

Default: 0 (unlimited)

Range of valid values: 0 or any positive integer

Takes effect: immediately

 

SP_SYS_SUSPEND_ON_ERROR

This parameter controls whether or not the Capture or Post process stops when it encounters a system or internal SharePlex error. The default of 1 directs the process to stop when there is an error. A setting of 0 directs the process to continue but generate a message in the Event Log.

Important: If Capture is stopped for too long, it can lose pace with Oracle, and the redo logs can wrap. If that happens, Capture reads the archive logs, but if the archive logs become unavailable, you will need to resynchronize the data.

 

Default: 1 (stop on errors)

Range of valid values: 0 or 1 (flag)

Takes effect: immediately

SP_SYS_TARGET_COMPATIBILITY

This parameter enables you to preserve compatibility between different versions of SharePlex to allow for smoother migrations and upgrades. As SharePlex continues to evolve to satisfy new user requirements, features or functionality added in a new version are not always compatible with previous versions. This parameter enables replication from a higher version of SharePlex on the source system to a lower version on a target system.

By default, this parameter is set to the version of the installed SharePlex software.

  • When replicating from a higher version on a source system to a lower version of SharePlex on a target, set this parameter to a value that most closely matches the version of SharePlex on the target. For example, if SharePlex is version 8.6.3 on the source and 8.6.2 on the target, set this parameter to 8.6.2.
  • When replicating between identical versions, leave this parameter set to the default on both systems.

 

Default: The version of the installed SharePlex software

Range of valid values: SharePlex release versions from 6.0.0 to the current version, up to three numbers long (for example 8.6.3).

Takes effect: when Capture is restarted

 

SP_SYS_VAR_FULL

This parameter sets a threshold for available space on the disk where the SharePlex variable- data directory is installed. It prevents the queues from exceeding available disk space. If an operation being processed by Capture, Read or Import will cause available disk space to drop below the value set for this parameter, the process stops. Processing resumes when available disk space reaches the threshold set with the SP_SYS_VAR_OK parameter.

 

Default: 30 MB

Range of valid values: any positive integer greater than the value of SP_SYS_VAR_OK

Takes effect: immediately

SP_SYS_VAR_OK

This parameter sets the amount of available disk space at which Capture, Read or Import resumes processing after it stopped because the value for SP_SYS_VAR_FULL was reached.

 

Default: 50 MB

Range of valid values: any positive integer

Takes effect: immediately