OCP-1Z0-053-V12.02-551题

551.Which command will result in a trace file being created with the create controlfile command contained

in it?

A. alter database backup controlfile;

B. alter database backup controlfile to trace;

C. alter database controlfile backup;

D. alter database controlfile backup to '/ora01/oracle/ctrl_backup.ctl';

E. alter database begin controlfile backup;

Answer: B

答案解析：

Backing Up Control Files

Use the ALTER DATABASE BACKUP CONTROLFILE statement to back up your control files. You have two options:

Back up the control file to a binary file (duplicate of existing control file) using the following statement:

ALTER DATABASE BACKUP CONTROLFILE TO '/oracle/backup/control.bkp';
Produce SQL statements that can later be used to re-create your control file:

ALTER DATABASE BACKUP CONTROLFILE TO TRACE;

This command writes a SQL script to a trace file where it can be captured and edited to reproduce the control file. View the alert log to determine the name and location of the trace file.

官方文档：http://docs.oracle.com/cd/E11882_01/server.112/e25494/control.htm#i1006485

演示：

sys@TEST0910> ALTER DATABASE BACKUP CONTROLFILE TO TRACE;

Database altered.

找出trace文件的路径

sys@TEST0910> show parameter dump

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

background_core_dump string partial

background_dump_dest string /u01/app/oracle/diag/rdbms/tes

t0910/test0910/trace

core_dump_dest string /u01/app/oracle/diag/rdbms/tes

t0910/test0910/cdump

max_dump_file_size string unlimited

shadow_core_dump string partial

user_dump_dest string /u01/app/oracle/diag/rdbms/tes

t0910/test0910/trace

进入trace文件的路径

[oracle@rtest ~]$ cd /u01/app/oracle/diag/rdbms/test0910/test0910/trace

[oracle@rtest trace]$ ls -lt 按照顺序排列

total 3656

-rw-r----- 1 oracle oinstall 188898 Sep 18 16:10 alert_test0910.log

-rw-r----- 1 oracle oinstall 7037 Sep 18 16:10 test0910_ora_6155.trc

-rw-r----- 1 oracle oinstall 132 Sep 18 16:10 test0910_ora_6155.trm

-rw-r----- 1 oracle oinstall 37725 Sep 18 16:09 test0910_mmon_31198.trc

-rw-r----- 1 oracle oinstall 3716 Sep 18 16:09 test0910_mmon_31198.trm

-rw-r----- 1 oracle oinstall 1011 Sep 18 06:00 test0910_j001_3483.trc

查看里面的内容：

[oracle@rtest trace]$ more test0910_ora_6155.trc

Trace file /u01/app/oracle/diag/rdbms/test0910/test0910/trace/test0910_ora_6155.trc

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1

System name: Linux

Node name: rtest.localdomain

Release: 2.6.18-308.el5

Version: #1 SMP Fri Jan 27 17:17:51 EST 2012

Machine: x86_64

VM name: VMWare Version: 6

Instance name: test0910

Redo thread mounted by this instance: 1

Oracle process number: 19

Unix process pid: 6155, image: oracle@rtest.localdomain (TNS V1-V3)

*** 2013-09-18 16:10:10.439

*** SESSION ID:(96.201) 2013-09-18 16:10:10.439

*** CLIENT ID:() 2013-09-18 16:10:10.439

*** SERVICE NAME:(SYS$USERS) 2013-09-18 16:10:10.439

*** MODULE NAME:(sqlplus@rtest.localdomain (TNS V1-V3)) 2013-09-18 16:10:10.439

*** ACTION NAME:() 2013-09-18 16:10:10.439

-- 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="test0910"

-- 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 重建脚本

-- 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 "TEST0910" NORESETLOGS ARCHIVELOG

MAXLOGFILES 16

MAXLOGMEMBERS 3

MAXDATAFILES 100

MAXINSTANCES 8

MAXLOGHISTORY 292

LOGFILE

GROUP 1 '/u01/app/oracle/oradata/test0910/redo01.log' SIZE 50M BLOCKSIZE 512,

GROUP 2 '/u01/app/oracle/oradata/test0910/redo02.log' SIZE 50M BLOCKSIZE 512,

GROUP 3 '/u01/app/oracle/oradata/test0910/redo03.log' SIZE 50M BLOCKSIZE 512

-- STANDBY LOGFILE

DATAFILE

'/u01/app/oracle/oradata/test0910/system01.dbf',

'/u01/app/oracle/oradata/test0910/sysaux01.dbf',

'/u01/app/oracle/oradata/test0910/undotbs01.dbf',

'/u01/app/oracle/oradata/test0910/users01.dbf',

'/u01/app/oracle/oradata/test0910/example01.dbf',

'/u01/app/oracle/oradata/test0910/testtb.dbf'

CHARACTER SET AL32UTF8

;

-- 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/fast_recovery_area/TEST0910/archivelog/2013_09_18/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

-- All logs need archiving and a log switch is needed.

ALTER SYSTEM ARCHIVE LOG ALL;

-- 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/test0910/temp01.dbf'

SIZE 30408704 REUSE AUTOEXTEND ON NEXT 655360 MAXSIZE 32767M;

-- End of tempfile additions.

-- Set #2. RESETLOGS case 重建脚本