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After Installing or Upgrading
Perform the following steps after installing or upgrading to Release 12.1.1 and before allowing users to access the system.
Manually fix database dbf file
If you installed 12.1.1 with a startCD of 12.1.1.9 or earlier (see Oracle Applications Release Notes, Release 12.1.1 My Oracle Support Document 798258.1), you must run the following sql commands to fix a particular corrupted dbf file:
$ sqlplus/nolog
sql> connect / as sysdba

sql> alter database datafile '[full path of system09.dbf]' resize 1000M;
sql> alter database datafile '[full path of system09.dbf]' resize 1500M;