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* Description: Knowledge of Oracle database control file
* Compatiablity: RDBMS 11g, 12c
* Date: 10:51 AM EST, 04/25/2017
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<1> Control File:
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|__ Every Oracle Database has a control file, which is a small binary file that records the physical structure of the database. The control file includes:
o. The database name
o. Names and locations of associated datafiles and redo log files
o. The timestamp of the database creation
o. The current log sequence number
o. Checkpoint information
The control file must be available for writing by the Oracle Database server whenever the database is open.
Without the control file, the database cannot be mounted and recovery is difficult.
The control file of an Oracle Database is created at the same time as the database. By default, at least one copy of the control file is created during database creation.
On some operating systems the default is to create multiple copies. You should create two or more copies of the control file during database creation.
You can also create control files later, if you lose control files or want to change particular settings in the control files.
<2> Dump control file to human reable format:
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|__ SQL> alter database backup controlfile to trace as '/u01/app/oracle/diag/rdbms/orcl/emeralit/trace/control_file.ctl';
#================ Plaint Text Format Controlfile ================#
-- The following are current System-scope REDO Log Archival related
-- parameters and can be included in the database initialization file.
--
-- LOG_ARCHIVE_DEST=''
-- LOG_ARCHIVE_DUPLEX_DEST=''
--
-- LOG_ARCHIVE_FORMAT=%t_%s_%r.dbf
--
-- DB_UNIQUE_NAME="orcl"
--
-- LOG_ARCHIVE_CONFIG='SEND, RECEIVE, NODG_CONFIG'
-- LOG_ARCHIVE_MAX_PROCESSES=4
-- STANDBY_FILE_MANAGEMENT=MANUAL
-- STANDBY_ARCHIVE_DEST=?/dbs/arch
-- FAL_CLIENT=''
-- FAL_SERVER=''
--
-- LOG_ARCHIVE_DEST_1='LOCATION=USE_DB_RECOVERY_FILE_DEST'
-- LOG_ARCHIVE_DEST_1='MANDATORY NOREOPEN NODELAY'
-- LOG_ARCHIVE_DEST_1='ARCH NOAFFIRM EXPEDITE NOVERIFY SYNC'
-- LOG_ARCHIVE_DEST_1='NOREGISTER NOALTERNATE NODEPENDENCY'
-- LOG_ARCHIVE_DEST_1='NOMAX_FAILURE NOQUOTA_SIZE NOQUOTA_USED NODB_UNIQUE_NAME'
-- LOG_ARCHIVE_DEST_1='VALID_FOR=(PRIMARY_ROLE,ONLINE_LOGFILES)'
-- LOG_ARCHIVE_DEST_STATE_1=ENABLE
--
-- Below are two sets of SQL statements, each of which creates a new
-- control file and uses it to open the database. The first set opens
-- the database with the NORESETLOGS option and should be used only if
-- the current versions of all online logs are available. The second
-- set opens the database with the RESETLOGS option and should be used
-- if online logs are unavailable.
-- The appropriate set of statements can be copied from the trace into
-- a script file, edited as necessary, and executed when there is a
-- need to re-create the control file.
--
-- Set #1. NORESETLOGS case
--
-- The following commands will create a new control file and use it
-- to open the database.
-- Data used by Recovery Manager will be lost.
-- Additional logs may be required for media recovery of offline
-- Use this only if the current versions of all online logs are
-- available.
-- After mounting the created controlfile, the following SQL
-- statement will place the database in the appropriate
-- protection mode:
-- ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "ORCL" NORESETLOGS NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 2336
LOGFILE
GROUP 1 '/u01/app/oracle/oradata/orcl/redo01.log' SIZE 50M BLOCKSIZE 512,
GROUP 2 '/u01/app/oracle/oradata/orcl/redo02.log' SIZE 50M BLOCKSIZE 512,
GROUP 3 '/u01/app/oracle/oradata/orcl/redo03.log' SIZE 50M BLOCKSIZE 512
-- STANDBY LOGFILE
DATAFILE
'/u01/app/oracle/oradata/orcl/system01.dbf',
'/u01/app/oracle/oradata/orcl/sysaux01.dbf',
'/u01/app/oracle/oradata/orcl/undotbs01.dbf',
'/u01/app/oracle/oradata/orcl/users01.dbf',
'/u01/app/oracle/oradata/nebf/nebf_data00.dbf',
'/u01/app/oracle/oradata/nebf/nebfprd_data00.dbf',
'/u01/app/oracle/oradata/emeralit/example.dbf',
'/u01/app/oracle/oradata/emeralit/TSD_PERFSTAT.dbf',
'/u01/app/oracle/oradata/emeralit/adtrack_data00.dbf'
CHARACTER SET WE8MSWIN1252
;
-- Configure snapshot controlfile filename
EXECUTE SYS.DBMS_BACKUP_RESTORE.CFILESETSNAPSHOTNAME('/u01/oracle/backup/emeralit_snapshot.ctl');
-- Configure RMAN configuration record 1
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('SNAPSHOT CONTROLFILE NAME','TO ''/u01/oracle/backup/emeralit_snapshot.ctl''');
-- Configure RMAN configuration record 2
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('RETENTION POLICY','TO RECOVERY WINDOW OF 10 DAYS');
-- Configure RMAN configuration record 3
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('CONTROLFILE AUTOBACKUP','ON');
-- Configure RMAN configuration record 4
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE','DISK TO ''/u01/oracle/backup/%F.ctl''');
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2017_04_25/o1_mf_1_1_%u_.arc';
-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2017_04_25/o1_mf_1_1_%u_.arc';
-- 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;
-- Commands to add tempfiles to temporary tablespaces.
-- Online tempfiles have complete space information.
-- Other tempfiles may require adjustment.
ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/oradata/orcl/temp01.dbf'
SIZE 20486M REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M;
ALTER TABLESPACE TSD_PERFSTAT_TMP ADD TEMPFILE '/u01/app/oracle/oradata/emeralit/TSD_PERFSTAT_TMP.dbf'
SIZE 209715200 REUSE AUTOEXTEND ON NEXT 20971520 MAXSIZE 1024M;
-- End of tempfile additions.
--
-- Set #2. RESETLOGS case
--
-- The following commands will create a new control file and use it
-- to open the database.
-- Data used by Recovery Manager will be lost.
-- The contents of online logs will be lost and all backups will
-- be invalidated. Use this only if online logs are damaged.
-- After mounting the created controlfile, the following SQL
-- statement will place the database in the appropriate
-- protection mode:
-- ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "ORCL" RESETLOGS NOARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 2336
LOGFILE
GROUP 1 '/u01/app/oracle/oradata/orcl/redo01.log' SIZE 50M BLOCKSIZE 512,
GROUP 2 '/u01/app/oracle/oradata/orcl/redo02.log' SIZE 50M BLOCKSIZE 512,
GROUP 3 '/u01/app/oracle/oradata/orcl/redo03.log' SIZE 50M BLOCKSIZE 512
-- STANDBY LOGFILE
DATAFILE
'/u01/app/oracle/oradata/orcl/system01.dbf',
'/u01/app/oracle/oradata/orcl/sysaux01.dbf',
'/u01/app/oracle/oradata/orcl/undotbs01.dbf',
'/u01/app/oracle/oradata/orcl/users01.dbf',
'/u01/app/oracle/oradata/nebf/nebf_data00.dbf',
'/u01/app/oracle/oradata/nebf/nebfprd_data00.dbf',
'/u01/app/oracle/oradata/emeralit/example.dbf',
'/u01/app/oracle/oradata/emeralit/TSD_PERFSTAT.dbf',
'/u01/app/oracle/oradata/emeralit/adtrack_data00.dbf'
CHARACTER SET WE8MSWIN1252
;
-- Configure snapshot controlfile filename
EXECUTE SYS.DBMS_BACKUP_RESTORE.CFILESETSNAPSHOTNAME('/u01/oracle/backup/emeralit_snapshot.ctl');
-- Configure RMAN configuration record 1
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('SNAPSHOT CONTROLFILE NAME','TO ''/u01/oracle/backup/emeralit_snapshot.ctl''');
-- Configure RMAN configuration record 2
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('RETENTION POLICY','TO RECOVERY WINDOW OF 10 DAYS');
-- Configure RMAN configuration record 3
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('CONTROLFILE AUTOBACKUP','ON');
-- Configure RMAN configuration record 4
VARIABLE RECNO NUMBER;
EXECUTE :RECNO := SYS.DBMS_BACKUP_RESTORE.SETCONFIG('CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE','DISK TO ''/u01/oracle/backup/%F.ctl''');
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2017_04_25/o1_mf_1_1_%u_.arc';
-- ALTER DATABASE REGISTER LOGFILE '/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2017_04_25/o1_mf_1_1_%u_.arc';
-- Recovery is required if any of the datafiles are restored backups,
-- or if the last shutdown was not normal or immediate.
RECOVER DATABASE USING BACKUP CONTROLFILE
-- Database can now be opened zeroing the online logs.
ALTER DATABASE OPEN RESETLOGS;
-- Commands to add tempfiles to temporary tablespaces.
-- Online tempfiles have complete space information.
-- Other tempfiles may require adjustment.
ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/oradata/orcl/temp01.dbf'
SIZE 20486M REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M;
ALTER TABLESPACE TSD_PERFSTAT_TMP ADD TEMPFILE '/u01/app/oracle/oradata/emeralit/TSD_PERFSTAT_TMP.dbf'
SIZE 209715200 REUSE AUTOEXTEND ON NEXT 20971520 MAXSIZE 1024M;
-- End of tempfile additions.
--
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