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Oracle alter system check datafile

Oracle Database Tips by Donald BurlesonJuly 6, 2015

Note:  The alter system check datafile command is obselete

The obsolete Oracle alter system check datafile command was first introduced to check data files when using Oracle Parallel Server (precursor to RAC), but you can still issue the "alter system check datafiles" command to ensure that the OPS node can read all associated data files.

Using "alter system check datafiles" verifies that the Oracle instance is able to access all OFFLINE data files. If GLOBAL is specified, all data files in all instances accessing the database are verified accessible. If LOCAL is specified only the current instance's data files are verified.

Remember, "alter system check datafiles" DOES NOT check online data files. It only serves to "verify" data files that are offline and hence, unverified.


system altered.



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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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