Guidelines

How do I control multiplexing files?

How do I control multiplexing files?

Multiplexing Control Files using the init.ora file

1. Shut down the database.
2. Copy the control file to more locations using operating system command.
3. Change the initialization parameter to include new file in the parameter CONTROL_FILES.
4. Start the instance.

Which type of file multiplexing does Oracle recommend?

Oracle recommends that you multiplex at least two copies of the control files on mirrored disks. This precaution allows transparent recovery of single failures, and retains fast recovery of the control file data in the case of double failure.

How do I copy a control file in ASM?

How to duplicate a controlfile in ASM

1. Identify the location of the current controlfile: SQL> select name from v$controlfile;
2. Shutdown the database and start the instance: SQL> shutdown normal.
3. Use RMAN to duplicate the controlfile:
4. On the ASM instance, identify the name of the controlfile:
5. On the database side:

What is Oracle control file?

Every Oracle database has a control file. A control file is a small binary file that records the physical structure of the database and includes: The database name. Names and locations of associated datafiles and online redo log files. The current log sequence number.

What are Oracle control files?

What is Spfile and Pfile in Oracle?

SPFILE is a binary file that contains the same information as the old PFILE. SPFILE permits dynamic changes without requiring you to restart that instance. If you choose to use the traditional text initialization parameter file (PFILE), you must specify the PFILE clause when issuing the STARTUP command.

How do I move control from one Diskgroup to another?

Relocation of Control File – from one diskgroup to another – Oracle 11.2. 0.4

1. STEP 1 – check the control file parameter to find current location.
2. STEP 2 – shutdown the database and startup in nomount state.
3. STEP 3 – use RMAN to restore control file from current location.

How do I move controls in Oracle 12c?

Moving Control Files

1. $ sqlplus “/ as sysdba” SQL> show.
2. SQL> shutdown. immediate; Database closed.
3. $ mkdir /u03/oradata/TEST. $ mv /u02/oradata/TEST/control*.ctl /u03/oradata/TEST. With the files moved, now update the init or spfile to indicate the new location.
4. $ sqlplus “/ as sysdba” Connected to an idle instance.

Is there a way to multiplex Oracle control files?

Answer: There are two ways to multiplex the oracle control files, init.ora and spfile. Multiplexing is the process of mintaining a copy of same control files on different disk drivers (and idealy on different controllers).

What does it mean to Multiplex Control Files?

Multiplexing is the process of mintaining a copy of same control files on different disk drivers (and idealy on different controllers). To multiplex your control files, we copy the control file to multiple locations and change the CONTROL_FILES parameter in the text based initialization file init.ora to include all control files names. 1.

What to do with ASM and redo multiplexing?

Currently without ASM our strategy is to multiplex online and archived redo to the flash recovery area (one copy to the ‘regular’ file system and one copy to the FRA). However as we migrate toward ASM it has been suggested that since the ASM disks are mirrored, that the added multiplexing redundency is no longer required.

How big is the control file for Oracle?

SQL> startup ORACLE instance started. Total System Global Area 755769344 bytes Fixed Size 2217184 bytes Variable Size 478153504 bytes Database Buffers 272629760 bytes Redo Buffers 2768896 bytes Database mounted. Database opened.