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12 Copyright © 2006, Oracle. All rights reserved. Automatic Storage Management.

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Presentation on theme: "12 Copyright © 2006, Oracle. All rights reserved. Automatic Storage Management."— Presentation transcript:

1 12 Copyright © 2006, Oracle. All rights reserved. Automatic Storage Management

2 12-2 Copyright © 2006, Oracle. All rights reserved. Objectives After completing this lesson, you should be able to: Identify the features of Automatic Storage Management (ASM) Set up initialization parameter files for ASM and database instances Execute SQL commands with ASM file names Start up and shut down ASM instances Administer ASM disk groups Use RMAN to migrate your database to ASM

3 12-3 Copyright © 2006, Oracle. All rights reserved. Automatic Storage Management: Review Portable and high-performance cluster file system Manages Oracle database files Data spread across disks to balance load Integrated mirroring across disks Solves many storage management challenges ASM File system Volume manager Operating system Application Database

4 12-4 Copyright © 2006, Oracle. All rights reserved. Automatic Storage Management: Review (notes only slide)

5 12-5 Copyright © 2006, Oracle. All rights reserved. ASM General Architecture ASM instance SID=asm ASM disks ASM disk group 1 DB instance SID= sales ASMB RBAL ARB 0 ARB A … ASM disks ASM disk group 2 ASM disks DBW 0 RBAL FG

6 12-6 Copyright © 2006, Oracle. All rights reserved.

7 12-7 Copyright © 2006, Oracle. All rights reserved. ASM Instance Tasks The following are tasks that you need to be able to perform in order to use an ASM instance: Create the ASM instance Set the initialization parameters Start the ASM instance Manage the ASM instance Shut down the ASM instance

8 12-8 Copyright © 2006, Oracle. All rights reserved. Creating an ASM Instance

9 12-9 Copyright © 2006, Oracle. All rights reserved. ASM Instance Initialization Parameters INSTANCE_TYPE = ASM DB_UNIQUE_NAME = +ASM ASM_POWER_LIMIT = 1 ASM_DISKSTRING = '/dev/rdsk/*s2', '/dev/rdsk/c1*' ASM_DISKGROUPS = dgroupA, dgroupB LARGE_POOL_SIZE = 8MB

10 12-10 Copyright © 2006, Oracle. All rights reserved. Database Instance Parameter Changes … INSTANCE_TYPE = RDBMS LOG_ARCHIVE_FORMAT DB_BLOCK_SIZE DB_CREATE_ONLINE_LOG_DEST_n DB_CREATE_FILE_DEST DB_RECOVERY_FILE_DEST CONTROL_FILES LOG_ARCHIVE_DEST_n LOG_ARCHIVE_DEST STANDBY_ARCHIVE_DEST LARGE_POOL_SIZE = 8MB …

11 12-11 Copyright © 2006, Oracle. All rights reserved. Starting Up an ASM Instance $ export ORACLE_SID='+ASM' $ sqlplus /nolog SQL> CONNECT / AS sysdba Connected to an idle instance. SQL> STARTUP; ASM instance started Total System Global Area bytes Fixed Size bytes Variable Size bytes Database Buffers bytes Redo Buffers bytes ASM diskgroups mounted

12 12-12 Copyright © 2006, Oracle. All rights reserved. Accessing an ASM Instance Disk group Storage system AS SYSDBA AS SYSOPER ASM instance All operationsNondestructive operations

13 12-13 Copyright © 2006, Oracle. All rights reserved. Accessing an ASM Instance (notes only slide)

14 12-14 Copyright © 2006, Oracle. All rights reserved. ASM Home Page

15 12-15 Copyright © 2006, Oracle. All rights reserved. ASM Performance Page

16 12-16 Copyright © 2006, Oracle. All rights reserved. ASM Configuration Page

17 12-17 Copyright © 2006, Oracle. All rights reserved. Shutting Down an ASM Instance SHUTDOWN NORMAL ASM instance Database instance ADatabase instance B

18 12-18 Copyright © 2006, Oracle. All rights reserved. DBCA and Storage Options

19 12-19 Copyright © 2006, Oracle. All rights reserved. ASM Storage: Concepts Database Tablespace Segment Extent Oracle data block Data file Physical block ASM disk ASM file Allocation unit (AU) File system file or raw device ASM disk group

20 12-20 Copyright © 2006, Oracle. All rights reserved. ASM Disk Groups A pool of disks managed as a logical unit Partitions total disk space into uniform sized units Spreads each file evenly across all disks Uses coarse- or fine-grain striping on the basis of file type Administers disk groups, not files Disk group ASM instance

21 12-21 Copyright © 2006, Oracle. All rights reserved. Failure Group Controller 1Controller 2 Failure group 1Failure group 2 Disk group A Controller 3 Failure group

22 12-22 Copyright © 2006, Oracle. All rights reserved. Disk Group Mirroring Mirror at AU level Mix primary and mirror AUs on each disk External redundancy: Defers to hardware mirroring Normal redundancy: –Two-way mirroring –At least two failure groups High redundancy: –Three-way mirroring –At least three failure groups

23 12-23 Copyright © 2006, Oracle. All rights reserved. Disk Group Dynamic Rebalancing Automatic online rebalance whenever storage configuration changes Only move data proportional to storage added No need for manual I/O tuning Online migration to new storage Configurable load on system using ASM_POWER_LIMIT

24 12-24 Copyright © 2006, Oracle. All rights reserved. Managing Disk Groups CREATE DISKGROUP ALTER DISKGROUP DROP DISKGROUP ASM instance Database instance

25 12-25 Copyright © 2006, Oracle. All rights reserved. ASM Administration Page

26 12-26 Copyright © 2006, Oracle. All rights reserved. Create Disk Group Page

27 12-27 Copyright © 2006, Oracle. All rights reserved. Creating and Dropping Disk Groups CREATE DISKGROUP dgroupA NORMAL REDUNDANCY FAILGROUP controller1 DISK '/devices/A1' NAME diskA1 SIZE 120G FORCE, '/devices/A2', '/devices/A3' FAILGROUP controller2 DISK '/devices/B1', '/devices/B2', '/devices/B3'; DROP DISKGROUP dgroupA INCLUDING CONTENTS;

28 12-28 Copyright © 2006, Oracle. All rights reserved. Adding Disks to Disk Groups ALTER DISKGROUP dgroupA ADD DISK '/dev/rdsk/c0t4d0s2' NAME A5, '/dev/rdsk/c0t5d0s2' NAME A6, '/dev/rdsk/c0t6d0s2' NAME A7, '/dev/rdsk/c0t7d0s2' NAME A8; ALTER DISKGROUP dgroupA ADD DISK '/devices/A*'; Disk formatting Disk group rebalancing

29 12-29 Copyright © 2006, Oracle. All rights reserved. Adding Disks to Disk Groups (notes only slide)

30 12-30 Copyright © 2006, Oracle. All rights reserved. Miscellaneous ALTER Commands ALTER DISKGROUP dgroupA DROP DISK A5; ALTER DISKGROUP dgroupA DROP DISK A6 ADD FAILGROUP fred DISK '/dev/rdsk/c0t8d0s2' NAME A9; ALTER DISKGROUP dgroupA UNDROP DISKS; Remove a disk from dgroupA : Add and drop a disk in a single command: Cancel a disk drop operation:

31 12-31 Copyright © 2006, Oracle. All rights reserved. Miscellaneous Alter Commands (notes only slide)

32 12-32 Copyright © 2006, Oracle. All rights reserved. ASM Files Database file ASM file automatically spread inside disk group dgroupA CREATE TABLESPACE sample DATAFILE '+dgroupA'; Automatic ASM file creation RMAN

33 12-33 Copyright © 2006, Oracle. All rights reserved. ASMCMD Utility $ asmcmd ASMCMD> ls -l DGROUP1/ORCL/DATAFILE Type Redund Striped Time Sys Name DATAFILE MIRROR COARSE OCT 05 21:00:00 Y HRAPPS DATAFILE MIRROR COARSE OCT 05 21:00:00 Y TBSASM ASMCMD> SQL> CREATE TABLESPACE tbsasm DATAFILE '+DGROUP1' SIZE 100M; Tablespace created. SQL> CREATE TABLESPACE hrapps DATAFILE '+DGROUP1' SIZE 10M; Tablespace created.

34 12-34 Copyright © 2006, Oracle. All rights reserved. Migrating Your Database to ASM Storage 1.Shut down your database cleanly. 2.Shut down the database and modify your server parameter file to use Oracle Managed Files (OMF). 3.Edit and execute the following RMAN script: STARTUP NOMOUNT; RESTORE CONTROLFILE FROM '/u1/c1.ctl'; ALTER DATABASE MOUNT; BACKUP AS COPY DATABASE FORMAT '+dgroup1'; SWITCH DATABASE TO COPY; SQL "ALTER DATABASE RENAME '/u1/log1' TO '+dgroup1' "; # Repeat RENAME command for all online redo log members... ALTER DATABASE OPEN RESETLOGS; SQL "ALTER DATABASE TEMPFILE '/u1/temp1' DROP";

35 12-35 Copyright © 2006, Oracle. All rights reserved. Migrating Your Database to ASM Storage (notes only slide)

36 12-36 Copyright © 2006, Oracle. All rights reserved. Summary In this lesson, you should have learned how to: Describe the concepts of Automatic Storage Management (ASM) Set up initialization parameter files for ASM and database instances Execute SQL commands with ASM file names Start up and shut down ASM instances Administer ASM disk groups Use RMAN to migrate your database to ASM

37 12-37 Copyright © 2006, Oracle. All rights reserved. Practice Overview: Using Automatic Storage Management This practice covers the following topics: Creating and starting an ASM instance Creating and using ASM disk groups Migrating a tablespace to ASM storage

38 12-38 Copyright © 2006, Oracle. All rights reserved.


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