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SharePlex 10.2 - Administration Guide

About this Guide Conventions used in this guide Revision History Overview of SharePlex Run SharePlex Run multiple instances of SharePlex Execute commands in sp_ctrl Set SharePlex parameters Configure data replication Configure replication to and from a container database Configure named queues Configure partitioned replication Configure replication to a change history target Configure a replication strategy Configure DDL replication Configure error handling Configure data transformation Configure security features Start replication on your production systems Monitor SharePlex Prevent and solve replication problems Repair out-of-sync data Tune the Capture process Tune the Post process Recover replication after Oracle failover Make changes to an active replication environment Apply an Oracle application patch or upgrade Back up Oracle data on the source or target Troubleshooting Tips Appendix A: Peer-To-Peer Diagram Appendix B: SharePlex environment variables

Continue to Post on DDL errors

By default, Post stops on DDL errors. An error usually indicates that the database component for which the DDL was executed on the source system does not exist in the target database. The default setting of the SP_OPO_STOP_ON_DDL_ERR parameter stops Post on DDL errors, so that subsequent DML on that object does not fail. This enables you to correct the problem and keep the databases synchronized. For more information about this parameter, see the SharePlex Reference Guide.

Increase the number of retries on error

Post will retry certain failed operations when there is the possibility that they will succeed with another attempt. The main operations that Post will retry are TNS write failures, connection failures, or locks on tables when Post needs to apply a TRUNCATE.

To increase the likelihood that the failed operations are successful, you can increase the SP_OPO_RETRIES_MAX parameter so that Post tries the operation more times. At the same time, increase the SP_OPO_RETRY_DELAY_TIME parameter to increase the time interval between the attempts. That gives the lock or other blocking operation enough time to be resolved between attempts.

If the Post process is set to continue on error (SP_SYS_SUSPEND_ON_ERROR=0) or if the error message is listed in the oramsglist file, Post moves on to the next transaction in the queue. In all other cases, Post stops after it reaches the maximum allowed attempts.

Important: Reducing this parameter can cause the data to accumulate in the queues, possibly causing them to exceed the available disk space.

For more information, see SP_OPO_RETRIES_MAX in the SharePlex Reference Guide.

Handle transactions that contain out-of-sync operations

You can configure Post to handle out-of-sync conditions. The following explains the default and alternate behaviors.

Default Post handling of out-of-sync errors

The default Post behavior when a transaction contains an out-of-sync operation is to continue processing other valid operations in the transaction to minimize latency and keep targets as current as possible. Latency is the amount of time between when a source transaction occurs and when it is applied to the target. Different factors affect the amount of latency in replication, such as unusually high transaction volumes or interruptions to network traffic.

Post logs the SQL statement and data for the out-of-sync operation to the ID_errlog.sql log file, where ID is the database identifier. This file is in the log sub-directory of the variable-data directory on the target system.

Stop on out-of-sync errors

You can configure Post to stop when it encounters an out-of-sync condition by setting the following parameter to 1:

  • Oracle targets: SP_OPO_OUT_OF_SYNC_SUSPEND
  • Open Target targets: SP_OPX_OUT_OF_SYNC_SUSPEND

If you use this feature, make certain to monitor replication frequently. If Post stops, latency increases and data accumulates in the queues. For more information, see the parameter documentation in the SharePlex Reference Guide.

Roll back the transaction if it generates out-of-sync errors

You can configure Post to roll back and discard a transaction if any operation in that transaction generates an out-of-sync error. The entire transaction is logged to a SQL file, but not applied to the target.You can edit the SQL file to fix the invalid DML and then run the SQL file to apply the transaction. This feature is enabled by setting the SP_OPO_SAVE_OOS_TRANSACTION to 1.

For more information, see the parameter documentation in the SharePlex Reference Guide.

Configure data transformation

This topic contains instructions for using the transformation feature of SharePlex. Transformation enables SharePlex to manipulate data before, or instead of, posting it to a target.

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