In both cases, the database includes an explanatory message in the alert log to let you know what was found.

In this case, you must drop the tablespace containing the data file.Ĭonversely, if a data file listed in the control file is not present in the data dictionary, then the database removes references to it from the new control file. If MISSING nnnn corresponds to a data file that was not read-only or offline normal, then you cannot use the rename operation to make the data file accessible, because the data file requires media recovery that is precluded by the results of RESETLOGS. If the actual data file corresponding to MISSING nnnn is read-only or offline normal, then you can make the data file accessible by renaming MISSING nnnn to the name of the actual data file. Would you please help me or give me some hints how the control file works with multiple date formats. I used 'DECODE' function but could not figure how make it work in control file. I received the flat file contained multiple date formats below. MISSING nnnn is flagged in the control file as being offline and requiring media recovery. I'm encountered with this type of problem how can SQLLoader control multiple date formats. If a data file exists in the data dictionary but not in the new control file, the database creates a placeholder entry in the control file under the name MISSING nnnn, where nnnn is the file number in decimal. The Oracle LTRIM function will remove a specified character from the left side of a string. It’s often used to remove space characters, such as where users enter an extra space that is not needed. The Oracle TRIM function will remove characters from the start or the end of a supplied string. You can subsequently change the value of the CONTROL_FILES initialization parameter to add more control files or to change the names or locations of existing control files. Purpose of the TRIM, LTRIM, and RTRIM Functions. Configuration parameters such as MAXLOGFILES, MAXLOGMEMBERS, MAXLOGHISTORY, MAXDATAFILES, and MAXINSTANCES affect control file size. The size of the control file changes between some releases of Oracle Database, as well as when the number of files specified in the control file changes. Also, if the size of the old control file differs from the SIZE parameter of the new one, you cannot use the REUSE clause. If files with the specified names currently exist at the time of database creation, you must specify the CONTROLFILE REUSE clause in the CREATE DATABASE statement, or else an error occurs. The following is an example of a CONTROL_FILES initialization parameter:ĬONTROL_FILES = (/u01/oracle/prod/control01.ctl, The file names specified in CONTROL_FILES should be fully specified and are operating system specific. The names of the control files are specified by the CONTROL_FILES parameter in the initialization parameter file used during database creation.

Decode oracle control file