How do you determine redo log size?

How do you determine redo log size?

By monitoring the date and time of the online redo logs at the operating system level (or querying V$LOG_HISTORY), you can determine whether to increase the size or number of online redo logs to reach an optimum switching interval.

Can I have redo log groups with different size?

All members of the same multiplexed redo log group must be the same size. Members of different groups can have different sizes. However, there is no advantage in varying file size between groups.

What is redo logs in Oracle?

Redo log files are operating system files used by Oracle to maintain logs of all transactions performed against the database. The primary purpose of these log files is to allow Oracle to recover changes made to the database in the case of a failure.

How do I recover lost redo log files?

Recovering After the Loss of All Members of an Online Redo Log Group

  1. Locate the filename of the lost redo log in V$LOGFILE and then look for the group number corresponding to it.
  2. Determine which groups are active.
  3. If the affected group is inactive, follow the procedure in Losing an Inactive Online Redo Log Group.

How do you find the frequency of a redo log switch?

Ideally redo log switch frequency should be 4-5 log switches per hour. If there is frequent log switches then check the size of redo logs and increase accordingly. V$LOG_HISTORY is used to check history of redo log generation in Oracle.

How do I find the current redo log file?

The V$LOGFILE view can be used to find the datafiles for the redo logs.

Where are redo logs stored?

Redo log files are used to record data changes to the database. The redo log files are initially specified within the CREATE DATABASE command. CREATE DATABASE . . . LOGFILE ‘/t02/oradata/MYDB/redo1.

Can we delete redo log files?

It is permissible to drop redo log files so that a multiplexed redo log becomes temporarily asymmetric. For example, if you use duplexed groups of redo log files, you can drop one member of one group, even though all other groups have two members each.