How can I get my datafile online?

How do you check the datafile is online or offline?

Bring All Data Files Online Connect sys/password as sysdba in sqlplus and run the following query to find which datafiles are offline: Select file# from v$datafile where status = 'OFFLINE'; Note all file# numbers that are returned. Then, while in sqlplus connected to the database as sys/password as sysdba.

How do I move my datafile online?

How To Move Datafiles Online Quickly?11) you need to place the datafile to a different location. By example: /u01/oradata/TSTDB/user_data01.dbf to /u02/oradata/TSTDB/user_data01.dbf.22) you need to rename the file, as the initial name is not correct, and you want to make the correction. ... 33) you are moving the file to ASM.How To Move Datafiles Online Quickly? - DBA Paradise

What is offline data file?

Offline datafiles are unavailable to the database and cannot be accessed until they are brought back online.

How do I recover a lost datafile in Oracle?

How to recover missing datafiles?1 Find the missing datafiles: ... 2 Take tablespace or datafiles offline: ... 3 Rename missing datafiles with original files: ... 4 Shutdown and mount the database: ... 5 Perform media recovery: ... 6 Open the database: ... 7 check the status of datafiles: ... 8 Bring the datafiles online:How to recover missing datafiles? | SAP Blogs