- How do I move Datafile from one disk to another?
- What is the purpose of redo log files?
- How do I manually use redo logs?
- How do I find the current redo log file?
- How do you check if redo log is corrupted?
- How do you rename redo log file online or offline give the command?
- How do I know the size of my redo log?
- How do I resize a redo log file?
- What is .DBF file in Oracle?
- How do I get rid of standby redo logs?
- Can we drop active redo log group?
- How do I reduce the redo log in Oracle?
- What is difference between archive and redo log?
- How do I recover lost redo log files?
- How do I move control from one folder to another?
How do I move Datafile from one disk to another?
Answer: Moving data files from one ASM diskgroup to another diskgroup involves these steps:Step 1: Get the data file name: select.
Step 2: Identify the target diskgroup to migrate to: select.
Step 3: Take the old data file offline: alter database datafile.
What is the purpose of redo log files?
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 manually use redo logs?
To apply the archived redo logs in the archive gapStart up and mount the standby database (if it is not already mounted). … Recover the database using the AUTOMATIC option: … Cancel recovery after the Oracle database server has applied the available logs, by executing the following statement (or typing CTRL+C):
How do I find the current redo log file?
The V$LOGFILE view can be used to find the datafiles for the redo logs.
How do you check if redo log is corrupted?
Find the corrupted group# from v$log; Select group# from v$log;Clear the archived group(corrupted) (alter database clear logfile group
How do you rename redo log file online or offline give the command?
To move or rename a logfile do the following.Shutdown the database.Rename the physical file on the OS.Start the database in mount mode.Issue the ALTER DATABASE RENAME FILE command to rename the file within the Oracle dictionary.Open the database.
How do I know the size of my redo log?
You can add up the total number of logs between log switches and divide by total time to obtain a rough estimate of the number of bytes of redo log generation.
How do I resize a redo log file?
How to Resize Redo Logs in OracleCheck Current Redo Logs.Add 3 Groups with New Size (1GB)Switch Logfile to New Groups.Force a CheckPoint.Drop Group 1, 2, 3.Remove Redo Log Files.Add Group 1, 2, 3 with New Size (1GB)Switch Logfile Several Times.More items…•Nov 2, 2018
What is .DBF file in Oracle?
Datafiles are physical files of the operating system that store the data of all logical structures in the database. They must be explicitly created for each tablespace. Oracle assigns each datafile two associated file numbers, an absolute file number and a relative file number, that are used to uniquely identify it.
How do I get rid of standby redo logs?
How to drop the standby redo logsEnviroment.SET STANDBY_FILE_MANAGEMENT=’MANUAL’Drop SRL On Standby.SET STANDBY_FILE_MANAGEMENT=’AUTO’Enable MRP.Enviroment. … SET STANDBY_FILE_MANAGEMENT=’MANUAL’ … Drop SRL On Standby.More items…
Can we drop active redo log group?
You can drop a redo log member only if it is not part of an active or current group. If you want to drop a member of an active group, first force a log switch to occur. Make sure the group to which a redo log member belongs is archived (if archiving is enabled) before dropping the member.
How do I reduce the redo log in Oracle?
Now drop redo log groups 1, 2, and 3: SQL> alter database drop logfile group 1; SQL> alter database drop logfile group 2; SQL> alter database drop logfile group 3; Verify the groups were dropped, and the new groups’ sizes are correct.
What is difference between archive and redo log?
Archive logs are archived redo(online) log files. In redo log files are all changes that happened to your data. If your database is in archivelog mode, than redo logs can’t be overwritten, they are archived in some other location when they are full. Redo and archive logs are used in various database recovery scenarios.
How do I recover lost redo log files?
Recovering After the Loss of All Members of an Online Redo Log GroupLocate 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.
How do I move control from one folder to another?
Moving Control Files$ sqlplus “/ as sysdba” … SQL> show. … SQL> shutdown. immediate; Database closed. … $ 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. … $ sqlplus “/ as sysdba” … Connected to an idle instance.