How do I move the online redo log?
How do I move the online redo log?
How to relocate the redo log files to a different location on…
- Shut down the database.
- Copy the online redo log files to the new location.
- Startup the database in mount mode, but do not open it.
- Rename the online redo log members.
- Open the database for normal operation.
How do I change the redo log location in Oracle?
You can use operating system commands to relocate redo logs, then use the ALTER DATABASE statement to make their new names (locations) known to the database….
- Shut down the database.
- Copy the redo log files to the new location.
- Startup the database, mount, but do not open it.
- Rename the redo log members.
How do I move the redo log in Oracle 12c?
Use the ALTER SYSTEM SWITCH LOGFILE statement to switch the logs and make the next group the current group: SQL> alter system switch logfile; After a log switch the log group that was previously the current group retains an active status as long as it contains redo that Oracle requires to perform crash recovery.
What is online redo log files?
The most crucial structure for recovery operations is the online redo log, which consists of two or more preallocated files that store all changes made to the database as they occur. Every instance of an Oracle database has an associated online redo log to protect the database in case of an instance failure.
Where are Oracle standby redo logs?
How to identify standby redo logs? SQL> select * from v$logfile where type=’STANDBY’; .
What is Oracle redo log?
What Is the Redo Log? The most crucial structure for recovery operations is the redo log, which consists of two or more preallocated files that store all changes made to the database as they occur. Every instance of an Oracle Database has an associated redo log to protect the database in case of an instance failure.
How do I move a Undo tablespace in Oracle 12c?
Create a new undo tablespace of the same size (larger or smaller) depending on your database requirements. sql> alter system set undo_tablespace = undotbs2 scope=both; 5. Check the status of the undo segments and determine if all the segments in the old undo tablespace are offline.
How do I recover lost redo log files?
Recovering After the Loss of All Members of an Online Redo Log Group
- Locate the filename of the lost redo log in V$LOGFILE and then look for the group number corresponding to it.
- Determine which groups are active.
- If the affected group is inactive, follow the procedure in Losing an Inactive Online Redo Log Group.
What is online redo log file in Oracle?
Every Oracle database has a set of two or more online redo log files. The set of online redo log files is collectively known as the redo log for the database. A redo log is made up of redo entries, which are also called redo records. The online redo log stores a copy of the changes made to data.
How do I restore a database using redo logs?
To perform time-based recovery:
- Issue the RECOVER DATABASE UNTIL TIME statement to begin time-based recovery.
- Apply the necessary redo log files to recover the restored datafiles.
- Apply redo logs until the last required redo log has been applied to the restored datafiles.
- Open the database in RESETLOGS mode.
How is Oracle database writes to the redo log?
How Oracle Database Writes to the Redo Log The redo log of a database consists of two or more redo log files. The database requires a minimum of two files to guarantee that one is always available for writing while the other is being archived (if the database is in ARCHIVELOG mode). See “Managing Archived Redo Logs” for more information.
Is it possible to move redo log files?
It is possible to move/rename the online redo logs should the need arise. This document will detail the steps required to move/rename the online redo logs in an 11gR2 environment on Linux. These steps also apply to a 10g environment.
Is there a thread of online redo in Oracle?
Each database instance has its own online redo log groups. These online redo log groups, multiplexed or not, are called an instance’s thread of online redo. In typical configurations, only one database instance accesses an Oracle database, so only one thread is present.
Which is the online version of the redo log?
The current redo log is always online, unlike archived copies of a redo log. Therefore, the online redo log is usually referred to as simply the redo log. This chapter contains the following topics: What Is the Redo Log? Planning the Redo Log Creating Redo Log Groups and Members Relocating and Renaming Redo Log Members