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Migrating files to ASM

Oracle 11g New Features Tips by Burleson Consulting

June 27, 2008

Moving files to ASM

The OEM page for Migrate Database to ASM makes it easier to use Enterprise Manager to migrate non-ASM databases.

Automatic Storage Management (ASM) was a new feature in Oracle 10g that freed the Remote DBA from managing files and disk drives, which eliminated the need for third-party volume managers.  Later, Oracle 10gR2 introduced the ability to migrate an entire database to ASM.  Finally, 11g now supports the capability to migrate tablespaces to ASM with a Tablespace Migration Wizard in OEM.

Initially, migrating a tablespace to ASM may be a little tricky. The process is begun by first clicking the Server tab, then Migrate to ASM.  Next is a prompt to enter host credentials, followed by a migration options screen.  The next screen presented is the Disk Group Options, as shown in Figure 4.11.

Figure 4.11 Using the Customize button within the Disk Group Options page

Click the Customize button, as noted in Figure 4.11 above, and the next screen allows the selection of specific tablespaces to migrate over to ASM, as shown in Figure 4.12.

Figure 4.12 Selecting tablespaces for migration to ASM

Workspace Manager

In 10g, using the Enterprise Manager 10g Java Console to manage Advanced Replication and Workspace was required.  However, in 11g Remote DBAs can access the Workspace Manager within OEM.  To access the Workspace Manager interface, click the Schema tab, then Workspaces.  The Workspace Manager has been improved to include support for:

  • Finding Referential Integrity Constraints

  • Compressing a Workspace

  • Managing System Parameters

  • Privilege Management

Find Referential Integrity Constraints

Previously, Remote DBAs would call the DBMS_WM.FindRICSet procedure to find tables that needed to be version-enabled due to referential integrity constraints.  11g provides an interface for this, as shown in Figure 4.13.

Figure 4.13 Version-enabling tables in the new 11g interface

Compress a Workspace

To compress a workspace within OEM, choose Compress from the Actions dropdown as shown in Figure 4.14.

Figure 4.14 Compressing workspaces

RMAN command line Aproach

Oracle ACE Aman Sharma also offers these suggestions for migrating to ASM using RMAN.  The migration from normal filesystem to ASM is actually not a very challenging task. All what you have to do is to:

1 - Take a backup on the Flash Recovery Area (FRA) which should be lying on the ASM diskgroup using RMAN's copy option.

2. Once this is done, using the RMAN "switch to copy option", the database would be shifted to ASM.


This is an excerpt from the new book Oracle 11g New Features: Expert Guide to the Important New Features by John Garmany, Steve Karam, Lutz Hartmann, V. J. Jain, Brian Carr.

You can buy it direct from the publisher for 30% off.

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