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Before you can create an ASM file system, you must create an ASM instance on your server. To create an ASM instance, you follow the same process you would when creating any other Oracle instance, with the big difference that you use a small number of initialization parameters. It should be noted that the ASM instance won t mount any Oracle database files. The ASM instance s main function is to maintain ASM file metadata, which the regular Oracle databases will use to access the ASM-based database files. An ASM instance usually requires only about 100MB of disk space. Unlike normal Oracle databases, ASM instances don t have data dictionaries, so you must connect as an administrator, either using operating system authentication as SYSDBA or SYSOPER, or using a password file, if you re working over a remote connection. To create the ASM instance, you have to have the SYSDBA privilege. You can perform most management tasks (apart from creating the instance and a few other tasks) with just the SYSOPER privilege, but connecting as SYSDBA means you ll have complete administrative privileges.

When you have very large SGAs, it can sometimes take a considerable amount of time for the instance to start. Oracle traditionally used to wait for the initialization of the entire buffer cache before starting the instance, which accounted for most of the delay. Oracle initializes only about 10 percent of the buffer cache before starting up the instance and opening the database. The remaining buffer cache is initialized by the checkpoint process after the database is opened.

If you choose to create a new Oracle database during the Oracle Database software installation, or you use the Database Configuration Assistant (DBCA) to create a database, all you have to do to use ASM is choose an ASM storage system from the three storage choices that you re offered (raw devices, OS file systems, and ASM). The DBCA will automatically create the ASM instance for you, along with the Oracle database.

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Unlike crash and instance recovery, media recovery isn t automatic the DBA has to initiate the recovery process. You need the following four items to perform a complete media recovery: A full backup of all datafiles Archived redo logs since the last full backup A control file copy Current online redo logs Oracle media recovery ensures the recovery of up-to-the-minute data, provided you have a copy of a recent backup and archived redo logs. The archived logs are transaction journals, and they contain the complete set of changes made to the database since the last backup. By using the archived redo logs and contents of the online redo logs, you can bring your database up to date. You ll see quite a bit of discussion on recovering databases from a media failure in this chapter.

You have to create an initialization parameter file with the following parameters before you can create the new instance: INSTANCE_TYPE: In an Oracle Database 10g database, you have two types of Oracle instances: RDBMS and ASM. RDBMS, of course, refers to the normal Oracle databases, and ASM refers to the new ASM instance. Set the INSTANCE_TYPE parameter to ASM. This will implicitly set the DB_UNIQUE_NAME parameter to +ASM. ASM_POWER_LIMIT: This is the maximum speed of this ASM instance during a rebalance disk operation. This operation redistributes the data files evenly and balances I/O load across the disks. The default is 1 and the range is from 1 to 11 (1 is slowest and 11 is fastest). ASM_DISKSTRING: This is the location where Oracle should look during a disk-discovery process. The format of the disk string may vary according to your operating system. You can specify a list of values as follows; this example limits the ASM discovery to disks whose names end in s1 and s2 only: ASM_DISKSTRING = '/dev/rdsk/*s1', '/dev/rdsk/*s2' ASM_DISKGROUPS: Here you specify the name of any disk group that you want to mount automatically at instance startup; the default value for this parameter is NULL.

Before you can begin a complete media recovery, you must take the datafiles to be recovered offline. You can drop a datafile directly from SQL*Plus with the DROP DATAFILE command. When you issue this command, the datafile is removed both from the tablespace and the operating system as well. Here s an example: SQL> ALTER TABLESPACE TEST DROP DATAFILE '/u01/app/oracle/test/test01.dbf'; If the datafile you d like to drop is the only datafile in a tablespace, you must drop the tablespace itself. The tablespace in which the datafile resides must also be online and read-write.

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