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.
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.
You can configure Post to handle out-of-sync conditions. The following explains the default and alternate behaviors.
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.
You can configure Post to stop when it encounters an out-of-sync condition by setting the following parameter to 1:
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.
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.
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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