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SharePlex 8.6.6 - Administration Guide

About this Guide Conventions used in this guide Overview of SharePlex Run SharePlex Run multiple instances of SharePlex Execute commands in sp_ctrl SharePlex parameters Prepare an Oracle environment for replication Create a configuration file Configure replication to Open Target targets Configure a replication strategy Configure partitioned replication Configure named queues Configure SharePlex to maintain a change history target Replicate Oracle DDL Set up error handling Transform data Configure SharePlex security features Activate replication in your production environment Monitor SharePlex Prevent and solve replication problems Repair out-of-sync Data Procedures to maintain Oracle high availability Make changes to an active replication environment Apply an Oracle application patch or upgrade Back up Oracle data on the source or target Tune the Capture process Tune the Post process Appendix A: Peer-To-Peer Diagram Appendix B: SharePlex environment variables

Create and populate SharePlex groups on Windows

Configure SharePlex security features > Assign SharePlex users to security groups > Create and populate SharePlex groups on Windows

On Windows, the SharePlex groups are created in the Windows User Accounts control panel by the SharePlex installer. To assign users to these groups, use that control panel after you install SharePlex.

Users can verify their authorization levels by issuing the authlevel command in sp_ctrl.

Activate replication in your production environment

Activate replication in your production environment

This chapter contains instructions for the initial startup of replication from a source database to a target database on production systems.

Contents

What is activation?

When you activate a configuration, through the activate config command in sp_ctrl, SharePlex does the following:

  • Activates (read) the configuration file to build a series of internal structures that identify objects and routes. Only one configuration can be active for any given datasource at a time. Configurations for different datasources on a system can be active at the same time. For example, you can activate a configuration for each Oracle instanceon a system.
  • Starts the processes that maintain the capture and replication of source transactions.
  • Reconciles replicated data with the copied data. SharePlex applies transactions that occurred after the copy was taken and discards transactions that occurred before the copy (and thus were applied by the copy and would be redundant if applied by replication). The reconcile process is only required for procedures that start replication while the source database is active.

The activation of a configuration generally proceeds as follows.

1. Assign an activation ID

SharePlex assigns an activation ID number to each configuration activation and its associated replication processes and queues. A configuration can be activated many times, and this ID keeps track of each one.

2. Create an object cache

SharePlex builds an object cache that records the standard metadata needed to support replication: the name, size, and type of columns, NOT-NULL constraints, and whether a column is part of a key. For tables using partitioned replication, additional information is stored.

3. Add a configuration change marker

SharePlex places a configuration-change marker in the data stream. This marker directs sp_cop to generate a new set of replication processes and queues. If another configuration is active for the same datasource, the marker deactivates it, causing the removal of the old processes and queues after the data they contain is posted.

4. Lock the tables, add the activation marker, unlock

SharePlex locks the tables that are listed in the configuration file so that it can obtain information about them while they are in a read-consistent state. As many tables can be locked concurrently as there are locking threads available. When SharePlex locks a table, it places an activation marker in the data stream that tells the Capture process to start (or stop) replicating that table.

Note: If an application uses NOWAIT locking on tables in the replication configuration, the NOWAIT could fail if it attempts to obtain a lock on an object that is already locked because it is being activated.

SharePlex locks the following:

  • All tables added to replication (new and reactivated configurations)
  • All tables removed from replication (reactivated configurations)
  • All tables where routes changed (reactivated configurations)

Each table is locked for a very short time, just long enough to activate a 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. Users can access the data in a source table when the activation lock is released.

Activation commands

Use sp_ctrl commands to activate, deactivate and view information about a configuration activation, as well as to reconcile ongoing changes with a copy. For more information about these commands, see the SharePlex Reference Guide.

Purpose Command
Activate a configuration file

activate config

Starts the activation and retains control of the sp_ctrl command line until the activation is finished.

View activation status

show activate

Provides a view of the status of all activation activity on a source system. If there are two or more concurrent activations, the command displays their status in the order in which they started.

View configuration statistics

show config

Shows statistics for active configurations. It displays the status of a configuration (active or inactive), the datasource, the date and time the configuration was activated, and the number of objects that are configured.

Deactivate a configuration file

deactivate config or abort config

The purposes of these commands are different, but both deactivate a configuration file.

  • deactivate config gracefully terminates replication for an active configuration. It stops all Capture activity for the configuration, posts all data currently in the queues, and removes the associated SharePlex processes and queues.
  • abort config is a forceful deactivation. It stops all replication activity for the configured datasource on the source and target systems, whether or not data in the queues has been posted.

Deactivating or aborting a configuration stops replication. If users continue making changes to the configured objects, the source and target data can go out of synchronization.

Reconcile replicated changes with the copy

reconcile

Coordinates the results of ongoing replication with a copy of the source data that is applied to the target system, so that changes that occurred before the copy are discarded.

View replication status status

Shows a summary of the status of replication to help you ensure that processes are running and to check for errors, warnings or notices.

View queue status

qstatus

Shows statistics for the capture, post, and export queues.

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