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alter database backup controlfile to trace

Oracle Database Tips by Donald BurlesonApril 1, 2015

Question:  What is the "alter database backup controlfile to trace" syntax and how is it used to recreate a database?

Answer:  Oracle provides the "alter database backup controlfile to trace" command to "punch", or copy the create database syntax into a trace file in your user dump directory.  When preparing a backup of a database, it is not uncommon to issue these commands:

1 - "alter database backup controlfile to trace"

2 - Fetch the create database file from your trace file directory

The "alter database backup controlfile to trace"  command will put the create database syntax in the trace file directory. The trace keyword tells oracle to generate a script containing a create controlfile command and store it in the trace directory identified in the user_dump_dest parameter of the init.ora file.

The output from "alter database backup controlfile to trace"  will look something like this:

STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "OLDLSQ" NORESETLOGS
NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 2
MAXDATAFILES 240
MAXINSTANCES 1
MAXLOGHISTORY 113
LOGFILE
GROUP 1 ('/u03/oradata/oldlsq/log1a.dbf',
'/u03/oradata/olslsq/log1b.dbf') SIZE 30M,
GROUP 2 ('/u04/oradata/oldlsq/log2a.dbf',
'/u04/oradata/oldlsq/log2b.dbf') SIZE 30M
DATAFILE
'/u01/oradata/oldlsq/system01.dbf',
'/u01/oradata/oldlsq/mydatabase.dbf'
;
# Recovery is required if any of the datafiles are restored
# backups, or if the last shutdown was not normal or immediate.
RECOVER DATABASE
# Database can now be opened normally.
ALTER DATABASE OPEN;

See here for a way to use "ALTER DATABASE BACKUP CONTROLFILE TO TRACE" to clone an Oracle database 

 
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