This document provides instructions and examples for configuring and managing Oracle Automatic Storage Management (ASM). It describes how to initialize ASM instances, create ASM disk groups, add and remove disks, monitor operations, and use ASM for database files like datafiles, control files, and redo logs. System views are listed that can be queried for ASM configuration details and statistics.

1. Anar Godjaev
ASM
/*Init parameters of ASM instance*/
INSTANCE_TYPE -- must be ASM
ASM_POWER_LIMIT -- [1-10]
ASM_DISKSTRING
ASM_DISKGROUPS
Css should be up and running for synchronizing db instance and asm
instance
-- crsctl check cssd
-- insufficient number of failure groups or disks running out of disk
space
select redundancy_lowered from v$asm_file;
-- free_mb . required_mirror_free_mb = 2 * usable_file_mb
select required_mirror_free_mb, usable_file_mb from v$asm_diskgroup;
creating diskgroup
-- disk names are available in v$asm_disk view
-- set ORACLE_SID and ORACLE_HOME for asm instance
sqlplus /nolog
SQL> connect / as sysdba
startup nomount;
create diskgroup<disk_group_name>normal|high|external redundancy
[force|noforce]
[failgroup<failgroupname>] DISK
•e<disk name>•' [NAME <diskname>],
•e<disk name>•'
[failgroup<failgroupname> DISK
•e<disk name>•',
•e<disk name>•']
alter diskgroup<disk_group_name> add disk
•'disk_name•' NAME diska1,
•'disk_name•' NAME diska2,
•'disk_name[5678]•',
•'disk_name*•' [FORCE]
[REBALANCE POWER 5 WAIT|NOWAIT]
alter diskgroup<disk_group_name> drop disk <disk_name>

2. Anar Godjaev
alter diskgroup<disk_group_name> resize disks [in failgroup
<failgroupname> [size 100M]]
alter diskgroup<disk_group_name> rebalance [WAIT|NOWAIT] [POWER n];
select * from v$asm_operation;
alter diskgroup<disk_group_name>|ALL MOUNT | DISMOUNT;
alter diskgroup<disk_group_name> check [REPAIR|NOREPAIR] all;
drop diskgroup<disk_group_name> INCLUDING | EXCLUDING contents;
alter diskgroup<disk_group_name> add directory
•'+<disk_group_name>/<dir_name>/..•';
alter diskgroup<disk_group_name> rename directory •'<dir1>•' to
•'<dir2>•';
alter diskgroup<disk_group_name> drop directory •'<dir_name>•';
alter diskgroup<disk_group_name> add alias •'..•' FOR •'..•';
select * from v$asm_alias;
alterdiskgroup<disk_group_name> drop file „..‟;
selectsoftware_version, compatible_version from v$asm_client;
--fully qualified asm filename
+group/dbname/file_type/file_type_tag.file.incarnation
+dgroup2/sample/controlfile/Current.256.541956473
--numericasm filename
+group.file.incarnation
+dgroup2.257.541956473
--incomplete ASM filenames
--asm creates the unique filename
alter system set db_create_file_dest=‟+diskgroup1‟;
--if you want asm to be default destination set the following init
parameters
DB_CREATE_FILE_DEST
DB_CREATE_ONLINE_LOG_DEST_n
DB_RECOVERY_FILE_DEST
CONTROL_FILES
LOG_ARCHIVE_DEST_n
LOG_ARCHIVE_DEST
STANDBY_ARCHIVE_DEST
LARGE_POOL_SIZE – minimum 1mb
-- Using an ASM Filename in a SQL Statement: Example
CREATE TABLESPACE tspace2 DATAFILE '+dgroup2' SIZE 200M AUTOEXTEND ON;

3. Anar Godjaev
-- Creating a Database in ASM
DB_CREATE_FILE_DEST = '+dgroup1'
DB_RECOVERY_FILE_DEST = '+dgroup2'
DB_RECOVERY_FILE_DEST_SIZE = 10G
CREATE DATABASE sample;
--Creating a Tablespace in ASM
DB_CREATE_FILE_DEST = '+dgroup2'
CREATE TABLESPACE tspace2;
‐‐the file is not an Oracle‐ managed file
CREATE UNDO TABLESPACE myundo
DATAFILE '+dgroup3(my_undo_template)/myfiles/my_undo_ts' SIZE 200M;
ALTER DISKGROUP dgroup3 DROP FILE '+dgroup3/myfiles/my_undo_ts';
--Adding New Redo Log Files
DB_CREATE_ONLINE_LOG_DEST_1 = '+dgroup1'
DB_CREATE_ONLINE_LOG_DEST_2 = '+dgroup2'
ALTER DATABASE ADD LOGFILE;
--Creating a Control File in ASM
--Noresetlogs example, script is from “alter database backup
controlfile to trace”
CREATE CONTROLFILE REUSE DATABASE "SAMPLE" NORESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 2
MAXDATAFILES 30
MAXINSTANCES 1
MAXLOGHISTORY 226
LOGFILE
GROUP 1 (
'+DGROUP1/db/onlinelog/group_1.258.541956457',
'+DGROUP2/db/onlinelog/group_1.256.541956473'
) SIZE 100M,
GROUP 2 (
'+DGROUP1/db/onlinelog/group_2.257.541956477',
'+DGROUP2/db/onlinelog/group_2.258.541956487'
) SIZE 100M
DATAFILE
'+DGROUP1/db/datafile/system.260.541956497',
'+DGROUP1/db/datafile/sysaux.259.541956511'
CHARACTER SET US7ASCII
;
--resetlogs example
CREATE CONTROLFILE REUSE DATABASE "SAMPLE" RESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 2
MAXDATAFILES 30

4. Anar Godjaev
MAXINSTANCES 1
MAXLOGHISTORY 226
LOGFILE
GROUP 1 (
'+DGROUP1',
'+DGROUP2'
) SIZE 100M,
GROUP 2 (
'+DGROUP1',
'+DGROUP2'
) SIZE 100M
DATAFILE
'+DGROUP1/db/datafile/system.260.541956497',
'+DGROUP1/db/datafile/sysaux.259.541956511'
CHARACTER SET US7ASCII
;
--system views
V$ASM_DISKGROUP
V$ASM_DISK
V$ASM_DISKGROUP_STAT
V$ASM_DISK_STAT
V$ASM_FILE
V$ASM_TEMPLATE
V$ASM_ALIAS
V$ASM_OPERATION
V$ASM_CLIENT