SharePlex 9.4 - Reference Guide

This starts the detailed reference documentation for SharePlex commands in alphabetical order.

Use the abort config command to deactivate a configuration instantly and delete all associated queues and replication processes at the same time. This command stops all replication activity for the configured datasource on the source and target systems, whether or not data in the queues has been posted. It is a forceful deactivation.

The abort config command is effective when there has been a system, configuration, or data problem and you need to prevent posting to the target system(s). Because you are deleting whatever data remains in the pipeline, the source and target instances will go out of synchronization after this command takes effect.

If any SharePlex replication process stops before or during the abort config command, the command also stops. When the process starts again, the command resumes working. This allows abort config to work even if the network is temporarily down — it remains in the queues until the connection is restored.

If there are multiple active configurations on the same source system, use the abort config command only if there are named export queues that separate the replication streams for each one. Without named export queues, SharePlex funnels all replicated data through one export queue, and an abort config command for one configuration deletes the data for all of them. To create named queues, see Chapter 5 of the SharePlex Administrator’s Guide.

Usage

Syntax

Syntax description

Remote options

These options enable you to issue the command on a remote machine and to script commands that include a login name, password, port number, or combination of those items.

Use the abort service command to terminate a SharePlex replication process (service) immediately, whether or not that process has finished reading from, or writing to, its queues. This command is effective when you cannot wait for a process to stop gracefully, or in unusual circumstances when a process will not shut down when you issue the stop command.

This command does not affect replicated data. The data remains safely in the queues, and SharePlex resumes normal processing when the process is started again.

A process aborted with the abort service command remains stopped even if SharePlex is shut down and re-started. Only the start command can start it again.

The abort service command provides options with which you can abort a process for any (or all) systems, or for a named queue, without affecting replication for other routes.

Usage

Syntax

Syntax description

Remote options

These options enable you to issue the command on a remote machine and to script commands that include a login name, password, port number, or combination of those items.

Use the activate config command to activate a configuration. Replication begins immediately as soon as the activation process is complete. For more information about what happens when you activate a configuration, see the SharePlex Administration Guide.

The activation process reads the configuration file, from which it gets all of the information needed for SharePlex to:

• Identify the objects that are in replication
• Route the replicated changes to the appropriate target database
• Generate the SQL that Post uses to apply the changes to the target
• Activate all of the tables that have been added to replication

The process that sp_cop calls to activate a configuration is sp_tconf.

Activation creates asynchronous, parallel processing threads to activate multiple tables simultaneously. Each table is locked for a very short time, just long enough to activate the table. Replication of each table begins as soon as its activation is complete.

Should one or more table fail to activate, SharePlex continues with the activation of the other tables. If an application uses NOWAIT locking on tables in the replication configuration, it could fail if it attempts to obtain a lock on an object being activated.

Guidelines for activation

• To activate a configuration, the database containing the objects to be replicated must be mounted and open. The length of time that activation takes varies, depending on the size, number and structure of the configured objects.
• You can activate one configuration per datasource (Oracle instance) on each system. For example, if there are ConfigA, ConfigB and ConfigC for instance ora10, you can activate only one of them at a time. Activating another configuration for the same datasource automatically deactivates the first one.
• Do not perform DDL, including TRUNCATE, during activation. DML changes are the only permissible changes during activation.
• Activation requires that the applications have retry logic. NOWAIT locking on tables in the replication configuration may cause the application to fail if it attempts to obtain a lock on an object that is being activated.
• The activation process retains control of the sp_ctrl interface until the activation is finished. To activate multiple configurations for different datasources on the same system, activate the first one, then open another session of sp_ctrl to activate the second one. Open as many sessions of sp_ctrl as you have configurations to activate.

• Before you activate a configuration, use the verify config command to confirm that basic requirements for successful activation and replication have been satisfied. The command alerts you to potential problems that can cause the activation to fail.

Set the number of activation threads

You can set the number of activation threads globally (for all activations) and you can override this setting for any activation.

To set the number of threads globally

1. Run sp_ctrl

2. Issue the following command. You may use a value of up to 32 threads.

   sp_ctrl> set param SP_OCF_THREAD_COUNT number_of_threads

To set the number of threads for the current activation

Use the [threads=n] option when you issue the activate config command.

View activation status and results

SharePlex activates objects according to their object ID, not their order in the configuration file, so there is no way to predict the order of activation.

Because SharePlex continues with activation whether or not individual tables fail to activate, it alerts you when tables fail to activate by displaying the following error message at the sp_ctrl prompt: “WARNING, not all objects activated successfully. Check activation log.”

To view the results of activation:

Issue the show config command

What to do if activation fails

Many things can cause the activation of a table or the entire configuration to fail. For example, if one or more components in the configuration file were entered incorrectly, activation of the affected objects fails.

If you did not issue the verify config command before you activated, run it now, and correct any problems that it finds. Then, try activating again. For more troubleshooting advice, see the SharePlex Administration Guide.

Usage

Syntax

Syntax description

Remote options

These options enable you to issue the command on a remote machine and to script commands that include a login name, password, port number, or combination of those items.