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Procedure documentation Setting Up a Standby Instance Locate the document in its SAP Library structure

This section describes how you set up a standby database with SAP DB.

Procedure

Use the Structure linkDatabase Manager for the following steps:

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       1.      Create the standby instance by making a copy of your original instance. Proceed as described in Creating a Homogeneous System Copy (points 1-5). However, do not start the copy in the Structure linkoperational state ONLINE; instead, keep it in the operational state ADMIN.

Note

Set up the original instance and standby instance on different hosts.

       2.      In the standby instance, create a Structure linkbackup medium for importing Structure linklog backups.

       3.      Make log backups in your active original instance at regular intervals.

       4.      Import these log backups into your standby instance with the time delay of your choice.

Note

In the Database Manager GUI, import the backups as described under Structure linkRestoring Without a Backup History.

In the Database Manager CLI, use the Structure linkrestore commands recover_start and recover_replace.

Notes

Keep the following points in mind:

·        The Structure linkdata volumes and Structure linklog volumes of the standby instance must be configured with enough space to be able to import the log backups of the original instance.

·        The two instances cannot access the same files. This means that their Structure linkrun directories must be physically separate.

·        You can use pipes to transport the data backup. You can transport log backups with ftp, or copy them with an exported file system (such as NFS or a shared file system).

Caution

You can start the standby instance in the operational state ONLINE, if you want it to replace the original instance as the active instance (see Starting the Standby Instance as an Active Instance). If the standby instance has been in the state ONLINE, but you still want to use it as a standby instance, then you must initialize the instance, and import a complete data backup of the original instance.

 

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