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name or the maximum number of redo log files. How do I create a new control file so that I can change the value of one or more of these permanent parameters?<p><B>Technique</B><p>Use the alter database command to generate a script summarizing the current state of the control file. Modify the script to reflect the desired changes to the permanent database parameters. Run the modified script to create a new control file.<p><B>Steps</B><p><B>1.</B>	Use Server Manager or Enterprise Manager to disconnect all user sessions. An easy, if unfriendly, way to do this is to shut down the database in Immediate mode after warning currently connected users.<p><B>2.</B>	Restart the database in Restricted mode by issuing the startup restrict command from Server Manager.<p><B>3.</B>	Enter the following alter database command.<p><CENTER><code>alter database backup controlfile to trace;</code></CENTER><p>This command creates a script that will generate a new control file. Under Windows NT, the script resides in a trace file that in turn resides in the subdirectory pointed to by initialization parameter user_dump_dest. The name of the trace file under Windows NT is of the form ORAxxxxx.TRC where xxxxx is a five-digit number equal to the Windows NT thread ID. If you are not using Windows NT, review your operating-system杝pecific documentation to ascertain the location of this trace file.<p><B>4.</B>	Open the trace file using any ASCII editor and modify the values of the permanent database parameters in the create controlfile command to the desired new values. Save this modified create controlfile command to another file. An example of a script containing a create controlfile command appears in Listing 1.2. In this case, the command will change the MAXDATAFILES parameter from the default value of 32 to a new value of 100.<p><table><tr><td><B>Listing 1.2 The create controlfile statement</B><p><code><b>.......MAXLOGFILES 32<br>.......MAXLOGMEMBERS 2<br>.......MAXDATAFILES 100<br>.......MAXINSTANCES 1<br>.......MAXLOGHISTORY 449<br><B>LOGFILE</B><br>..GROUP 1 慍:\ORANT\DATABASE\LOG1O8HT.ORA
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