How do I find the ASM parameter file?

  January 8, 2021
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How do I find the ASM parameter file?

ASM spfile discovery

  1. The location of the initialization parameter file specified in the Grid Plug and Play (GPnP) profile.
  2. If the location has not been set in the GPnP profile, then the search order changes to: SPFILE in the Oracle ASM instance home (e.g. $ORACLE_HOME/dbs/spfile+ASM. ora)

What are ASM instance initialization parameters?

Initialization Parameters and ASM Instance Creation. The initialization parameters that are of specific interest for an ASM instance are: INSTANCE_TYPE – Set to ASM or RDBMS depending on the instance type. The default is RDBMS. DB_UNIQUE_NAME – Specifies a globally unique name for the database.

How do I start an ASM with Pfile?

Steps to Recreate spfile from pfile in ASM

  1. STEP 1: Shut down the database cluster.
  2. STEP 2: Start only one instance using existing pfile in nomount state.
  3. STEP 3: Create spfile on ASM from existing pfile.
  4. STEP 4: Shutdown and start the database.
  5. STEP 5: Check the status of the database.

How do I add a raw disk to ASM?

Follow the below steps to add a disk to ASM diskgroup in Oracle 19c.

  1. Create ASM disk.
  2. Check the ASM disks.
  3. Add disk to ASM diskgroup.
  4. Check the rebalance status.
  5. Check the newly added disk in ASM Diskgroup.

How do I read ASM Spfile?

Overview – steps to read an ASM Spfile

  1. Use Pnp play tool: gpnptool getpval -asm_dis to read ASM disk discovery path.
  2. Scan all available ASM disk header to find ASM disks having a spfile reference.
  3. Read the related block and dump the SPfile entries.

What is ASM instance?

An Oracle ASM instance is built on the same technology as an Oracle Database instance. An Oracle ASM instance has a System Global Area (SGA) and background processes that are similar to those of Oracle Database. Oracle ASM and database instances require shared access to the disks in a disk group.

Can we create spfile from pfile?

A SPFILE is created from a PFILE using one of the following commands. SQL> CREATE SPFILE FROM PFILE = ‘$ORACLE_HOME/dbs/my_pfile. ora’; SQL> CREATE SPFILE = ‘$ORACLE_HOME/dbs/my_spfile.

How do you create a pfile from Spfile in ASM when database is down?

How to move spfile from ASM to filesystem

  1. Create pfile from the spfile. First, we will create pfile in filesystem from the existing spfile in ASM.
  2. Remove the spfile from ASM. We can now connect the the ASM instance and remove the spfile residing in ASM disk group.
  3. Recreate the spfile.
  4. Start the database using new spfile.

How do I add a former disk to ASM?

  1. Create ASM disk. Get the Lun name from storage team. Lun Name – /dev/sda1.
  2. Check the ASM Disks, Check the newly added disk, $sudo oracleasm listdisks.
  3. Create the ASM Diskgroup. $sqlplus / as sysasm.
  4. Check the rebalance status. $sqlplus / as sysasm.
  5. Check the newly added disk in ASM Diskgroup.

How do I start the Oracle ASM instance with an incorrect spfile?

If the SPFILE path in the GPnP profile is incorrect, you can start the Oracle ASM instance as follows: Create a PFILE with one line in it that identifies the path to the SPFILE. SPFILE=’+DATA/asm/asmparameterfile/asmspfile.ora’ Start up the instance using the initialization parameter file.

What is ASM initialization parameter in Oracle?

ASM Initialization Parameters. Some of the important parameter in Oracle ASM are. asm_diskstring. This parameter limit the set of disks that Automatic Storage Management considers for discovery. The parameters default value is . This default causes ASM to find all of the disks in a platform-specific location to which it has read/write access.

What is a remote instance of ASM?

A remote instance is an Oracle Database, Oracle IOServer, or Oracle ASM proxy instance located on a different node than the Oracle ASM instance. The following is an example of setting the ASM_DISKGROUPS parameter dynamically:

Is it possible to change the ASM parameter while ASM is up?

This parameter is dynamic and can be modified while ASM is Up. You dont need to bounce the ASM instance. But You should not changing the diskstring to exclude those disk for which diskgroup is mounted.It will give error in that while modifying the parameter.