Posts Tagged ‘Archive Log Mode’

Enable Pluggable Database(PDB) Archivelog Mode

August 26th, 2019, posted in Oracle Queries

Enabling archive log mode -12c pluggable database/Container database

Since the Redologs are created at container database level in 12c and not at pluggable database level.
(Enabling archivelog at pluggable database level is not possible). Archiving is done at CDB’s.

You can check archive log mode either by querying v$database or archive-log list :

SQL> select name,open_mode,log_mode from v$database;

NAME      OPEN_MODE            LOG_MODE
--------- -------------------- ------------
CDB      READ WRITE           NOARCHIVELOG

(OR)

SQL> archive log list
Database log mode        Archive Mode
Automatic archival        Disabled
Archive destination        USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     11
Next log sequence to archive   13
Current log sequence        13

***************  ***************
To enable the Archive-log mode
***************  ***************

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount;
ORACLE instance started.

Total System Global Area  788529152 bytes
Fixed Size      2929352 bytes
Variable Size    541068600 bytes
Database Buffers   239075328 bytes
Redo Buffers      5455872 bytes
Database mounted.

SQL> ALTER DATABASE ARCHIVELOG;
Database altered.

SQL> ALTER DATABASE OPEN;
Database altered.

SQL> select name,open_mode,log_mode from v$database;

NAME      OPEN_MODE            LOG_MODE
--------- -------------------- ------------
CDB      READ WRITE           ARCHIVELOG



SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     413
Next log sequence to archive   415
Current log sequence           415

SQL> show parameter DB_RECOVERY_FILE_DEST

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest                string      /u03/app/oracle/fast_recovery_area
db_recovery_file_dest_size           big integer 27G

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Database Log Switch Intervals

December 4th, 2017, posted in Oracle Queries

Oracle Database Log Switch Intervals :

Hourly Log Switch breakdown :

SELECT * FROM (
SELECT * FROM (
SELECT   TO_CHAR(FIRST_TIME, 'DD/MM') AS "DAY"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '00', 1, 0)), '99') "00:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '01', 1, 0)), '99') "01:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '02', 1, 0)), '99') "02:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '03', 1, 0)), '99') "03:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '04', 1, 0)), '99') "04:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '05', 1, 0)), '99') "05:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '06', 1, 0)), '99') "06:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '07', 1, 0)), '99') "07:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '08', 1, 0)), '99') "08:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '09', 1, 0)), '99') "09:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '10', 1, 0)), '99') "10:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '11', 1, 0)), '99') "11:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '12', 1, 0)), '99') "12:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '13', 1, 0)), '99') "13:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '14', 1, 0)), '99') "14:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '15', 1, 0)), '99') "15:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '16', 1, 0)), '99') "16:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '17', 1, 0)), '99') "17:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '18', 1, 0)), '99') "18:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '19', 1, 0)), '99') "19:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '20', 1, 0)), '99') "20:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '21', 1, 0)), '99') "21:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '22', 1, 0)), '99') "22:00"
       , TO_CHAR(SUM(DECODE(TO_CHAR(FIRST_TIME, 'HH24'), '23', 1, 0)), '99') "23:00"
    FROM V$LOG_HISTORY
    WHERE extract(year FROM FIRST_TIME) = extract(year FROM sysdate)
GROUP BY TO_CHAR(FIRST_TIME, 'DD/MM')
) ORDER BY TO_DATE(extract(year FROM sysdate) || DAY, 'YYYY DD/MM') DESC
) WHERE ROWNUM < 30
/

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Oracle Database-Archive Log Sizes Spooled

November 25th, 2017, posted in Oracle Queries

Database – Archive Log Sizes Spooled :

1) Info on archived logs spooled/deleted during the past 24 hours

2) Info on archived logs spooled/deleted during the previous 7 days

3) Info on archived logs spooled/deleted during the previous 31 days

1) Info on archived logs spooled/deleted during the past 24 hours:

SELECT SUM_ARCH.DAY,
 SUM_ARCH.GENERATED_MB,
 SUM_ARCH_DEL.DELETED_MB,
 SUM_ARCH.GENERATED_MB - SUM_ARCH_DEL.DELETED_MB "REMAINING_MB"
 FROM ( SELECT TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY') DAY,
 SUM (ROUND ( (blocks * block_size) / (1024 * 1024), 2))
 GENERATED_MB
 FROM V$ARCHIVED_LOG
 WHERE ARCHIVED = 'YES'
 AND COMPLETION_TIME >SYSDATE-1
 GROUP BY TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY')) SUM_ARCH,
 ( SELECT TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY') DAY,
 SUM (ROUND ( (blocks * block_size) / (1024 * 1024), 2))
 DELETED_MB
 FROM V$ARCHIVED_LOG
 WHERE ARCHIVED = 'YES' AND DELETED = 'YES'
 GROUP BY TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY')) SUM_ARCH_DEL
 WHERE SUM_ARCH.DAY = SUM_ARCH_DEL.DAY(+)
 ORDER BY TO_DATE (DAY, 'DD/MM/YYYY');

2) Info on archived logs spooled/deleted during the previous 7 days:

SELECT SUM_ARCH.DAY,
 SUM_ARCH.GENERATED_MB,
 SUM_ARCH_DEL.DELETED_MB,
 SUM_ARCH.GENERATED_MB - SUM_ARCH_DEL.DELETED_MB "REMAINING_MB"
 FROM ( SELECT TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY') DAY,
 SUM (ROUND ( (blocks * block_size) / (1024 * 1024), 2))
 GENERATED_MB
 FROM V$ARCHIVED_LOG
 WHERE ARCHIVED = 'YES'
 AND COMPLETION_TIME >SYSDATE-7
 GROUP BY TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY')) SUM_ARCH,
 ( SELECT TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY') DAY,
 SUM (ROUND ( (blocks * block_size) / (1024 * 1024), 2))
 DELETED_MB
 FROM V$ARCHIVED_LOG
 WHERE ARCHIVED = 'YES' AND DELETED = 'YES'
 GROUP BY TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY')) SUM_ARCH_DEL
 WHERE SUM_ARCH.DAY = SUM_ARCH_DEL.DAY(+)
 ORDER BY TO_DATE (DAY, 'DD/MM/YYYY');

3) Info on archived logs spooled/deleted during the past 31 days:

SELECT SUM_ARCH.DAY,
 SUM_ARCH.GENERATED_MB,
 SUM_ARCH_DEL.DELETED_MB,
 SUM_ARCH.GENERATED_MB - SUM_ARCH_DEL.DELETED_MB "REMAINING_MB"
 FROM ( SELECT TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY') DAY,
 SUM (ROUND ( (blocks * block_size) / (1024 * 1024), 2))
 GENERATED_MB
 FROM V$ARCHIVED_LOG
 WHERE ARCHIVED = 'YES'
 AND COMPLETION_TIME >SYSDATE-31
 GROUP BY TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY')) SUM_ARCH,
 ( SELECT TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY') DAY,
 SUM (ROUND ( (blocks * block_size) / (1024 * 1024), 2))
 DELETED_MB
 FROM V$ARCHIVED_LOG
 WHERE ARCHIVED = 'YES' AND DELETED = 'YES'
 GROUP BY TO_CHAR (COMPLETION_TIME, 'DD/MM/YYYY')) SUM_ARCH_DEL
 WHERE SUM_ARCH.DAY = SUM_ARCH_DEL.DAY(+)
 ORDER BY TO_DATE (DAY, 'DD/MM/YYYY');

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Steps To Configure Archive Log Mode in Oracle Database 11g

April 24th, 2016, posted in Oracle Queries

Mode of Logging

There are two types of logging modes in Oracle Database :

ARCHIVELOG :
In this type of logging whatever oracle writes in a redo log file related to transactions in database, saved to another location after a log file has been filled . This location is called Archive location. if database is in Archive log mode then in case of any disaster, we can recover our database upto the last commit and user don’t have to reenter their data. Until a redo log file is not written to the Archive location it cannot be reused by oracle to write redo related data.

NOARCHIVELOG :
In this type of logging whatever oracle writes in a redo log file related to transactions in database must be overwritten when all the log files have been filled. In this type of logging we can recover our database upto the last consistent backup we have with us, after that users have to reenter their data.

How to check log mode in Oracle Database 10g/11g :

[cognos@rac1 u02]$ sqlplus
 
 SQL*Plus: Release 11.2.0.1.0 Production on Thu Oct 25 23:03:44 2012
 
 Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
 Enter user-name: /as sysdba
 
 Connected to:
 Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
 With the Partitioning, Automatic Storage Management, OLAP, Data Mining
 and Real Application Testing options
 
 SQL> archive log list
 Database log mode              No Archive Mode
 Automatic archival             Disabled
 Archive destination            /backup/orcl/
 Oldest online log sequence     1
 Current log sequence           1

 SQL> select name,log_mode from v$database;
 NAME      LOG_MODE
 --------- -    -----------
 ORCL      NOARCHIVELOG
 
 Currently the ORCL database is in NOARCHIVELOG mode

To change the Oracle database in ARCHIVELOG mode. Below mentioned steps :

1. If needed set the archive log destination where you want to save your archive logs whether to a single location or to multiple location. If this is not set then Oracle save archive log files in DB_RECOVERY_FILE_DEST location if set. If you have not set your DB_RECOVERY_FILE_DEST location then you have to set your archive location before changing your database to ARCHIVELOG mode.

SQL> alter system set log_archive_dest_1='LOCATION=/u02/archive' scope=spfile;
System altered.
 
Note -- To change this parameter while database is open, your database has to run with SPFILE, if running through PFILE then shut down your database and make changes in your PFILE and then start the database in MOUNT mode using that changed PFILE

2. After this you need to shut down your database and start again in MOUNT mode

SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount;
ORACLE instance started.

Total System Global Area 1025298432 bytes
Fixed Size                  1341000 bytes
Variable Size             322963896 bytes
Database Buffers          696254464 bytes
Redo Buffers                4739072 bytes
Database mounted.

SQL> alter database archivelog;
Database altered.

SQL> alter database open;

Database altered.

SQL> archive log list

Database log mode              Archive Mode
 Automatic archival             Enabled
 Archive destination            /u02/archive
 Oldest online log sequence     1
 Next log sequence to archive   1
 Current log sequence           1

SQL> select name,log_mode from v$database;

NAME      LOG_MODE
---------      ------------
ORCL      ARCHIVELOG

Database changed to ARCHIVELOG mode.

Note :- After you changed your database to ARCHIVELOG mode, take a backup of your database immediately because in recovery scenarios you can recover your database from the last backup taken in this mode. #############################################################################

To change the Oracle database in NOARCHIVELOG mode. Below mentioned steps:

1.Shutdown your running database.


SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

2. Start your database in MOUNT mode.

SQL> startup mount
ORACLE instance started.

Total System Global Area 1025298432 bytes
Fixed Size                  1341000 bytes
Variable Size             322963896 bytes
Database Buffers          696254464 bytes
Redo Buffers                4739072 bytes
Database mounted.

SQL> alter database noarchivelog;
Database altered.

SQL> alter database open;
Database altered.

SQL> archive log list
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            /u02/archive
Oldest online log sequence     1
Current log sequence           1

SQL> select name,log_mode from v$database;

NAME      LOG_MODE
---------      ------------
ORCL      NOARCHIVELOG

Database changed to NOARCHIVELOG mode !!

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Posts Tagged ‘Archive Log Mode’

Enable Pluggable Database(PDB) Archivelog Mode

Database Log Switch Intervals

Oracle Database Log Switch Intervals :

Oracle Database-Archive Log Sizes Spooled

Database – Archive Log Sizes Spooled :

Steps To Configure Archive Log Mode in Oracle Database 11g

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POiSON WORLD

Posts Tagged ‘Archive Log Mode’

Enable Pluggable Database(PDB) Archivelog Mode

Database Log Switch Intervals

Oracle Database Log Switch Intervals :

Oracle Database-Archive Log Sizes Spooled

Database – Archive Log Sizes Spooled :

Steps To Configure Archive Log Mode in Oracle Database 11g

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