What will be the Archived Redo Log Destination in Oracle

As a sysdba privilege issue "archive log list" to see your present archival destination settings.

SQL> ARCHIVE LOG LIST
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 1
Next log sequence to archive 2
Current log sequence 2

•Based on the destination you can see the physical destination of your archived redo log file in the v$parameter. You can use,

SQL> SHOW PARAMETER DB_RECOVERY_FILE_DEST

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string /oradata2/flash_recovery_area
db_recovery_file_dest_size big integer 2G

Now a question is for which parameter settings my archived destination affects. In the following I will try to clear the idea.

•If you set LOG_ARCHIVE_DEST parameter then this parameter is used to locate the archived redo log destination.

•If you set DB_RECOVERY_FILE_DEST and and no LOG_ARCHIVE_DEST_n is specified, then LOG_ARCHIVE_DEST_10 is implicitly set to archival destination. However if you set LOG_ARCHIVE_DEST_10 explicitly empty then this behavior changed. Like,

SQL> select DEST_NAME,DESTINATION from v$archive_dest where dest_name='LOG_ARCHIVE_DEST_10';

DEST_NAME DESTINATION
------------------------------ ------------------------------
LOG_ARCHIVE_DEST_10 USE_DB_RECOVERY_FILE_DEST

Though you can implicitly change DB_RECOVERY_FILE_DEST to another destination like LOG_ARCHIVE_DEST_9.

SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_9='LOCATION=USE_DB_RECOVERY_FILE_DEST';
System altered.

SQL> select DEST_NAME,DESTINATION from v$archive_dest where dest_name='LOG_ARCHIVE_DEST_10';
DEST_NAME DESTINATION
------------------------------ ------------------------------
LOG_ARCHIVE_DEST_10

SQL> select DEST_NAME,DESTINATION from v$archive_dest where dest_name='LOG_ARCHIVE_DEST_9';
DEST_NAME DESTINATION
------------------------------ ------------------------------
LOG_ARCHIVE_DEST_9 USE_DB_RECOVERY_FILE_DEST


•If you set any local destinations for LOG_ARCHIVE_DEST_n, then archived redo logs are stored only in the destinations you specify using those parameters. In this case, redo log files are not archived in the flash recovery area by default. Though if you want to archive redo log to flash recover area then use LOCATION=USE_DB_RECOVERY_FILE_DEST as in previous example.

•If you do not set any value for LOG_ARCHIVE_DEST, LOG_ARCHIVE_DEST_n, or DB_RECOVERY_FILE_DEST, then the redo logs are archived to a default location that is platform-specific. On Solaris, for example, the default is ?/dbs/arch.

SQL> alter system set log_archive_dest_9='';
System altered.

SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination ?/dbs/arch
Oldest online log sequence 1
Next log sequence to archive 2
Current log sequence 2

Comments

Post a Comment

Popular posts from this blog

How to make partitioning in Oracle more Quickly

As the table size grows and full table scans happens more frequently then there is no alternative than partitioning in oracle. Partition greatly enhance performance of a query. I will start my partitioning system simply with an example. In my database the following query took 30~35 seconds to complete. After partitioning the performance increased amazingly and it then took only 1 second. My query was, SELECT DISTINCT fs.type, fs.id , fs.pid, fs.cid , fs.cr_id, fs.created_date FROM summary fs where fs.id in (select fa.id from forms fa where fa.sar in (select la.sar from login la where la.login_id=1 and fa.created_date BETWEEN to_date('1-MAY-2008') AND to_date('21-SEP-2008') and fs.created_date BETWEEN to_date('1-MAY-2008') AND to_date('21-SEP-2008') ) )and mode=0; After seeing above query I decide to make range partition on column created_date both in summary table and forms table. Below is the list of procedur
Read more

Copy files between Unix and Windows with rcp

There are many third party tools by which you can copy files between windows and unix machine. Some common tools are winscp, SSHSecureShellClient etc. Instead of using any third party tool, you can use original unix and windows built-in tool to do the task. The RCP (Remote CoPy) is a standard UNIX tool and a Microsoft Windows 2000 tool that copies files/folder to and from computer running the RCP service. Before you can use the RCP tool from a Windows-based computer you must do something in your UNIX computer. you must turn on the RCP service and update the security files to allow the Windows-based computer to connect to your unix machine over this service. The following steps will help you. Step 01: Turn on RCP service on UNIX Host Turn on the RCP service on unix machine by using inetd: 1. Log on as root. 2. Edit the file /etc/Inetd.conf. 3. Uncomment the lines that start with shell and that start with exec. 4. Save the file. 5. Use ps -ef |grep inetd and determine inetd service p
Read more

ORA-04062: timestamp of procedure has been changed

Problem Description In the database I have created one procedure named a as below. create or replace procedure a(a number) as begin insert into t1 values(1); commit; end; / Now after creating database link using remote database machine whenever I access this procedure "A" it executes successfully and I get value "1" in table t1. Like below in example where orastdby_m is the database link, shaik is the schema name and value 1 is the argument value though argument value is not used in the procedure. SQL> exec shaik.a@orastdby_m(1); PL/SQL procedure successfully completed. Now in the source database machine I changed the procedure as below. Though you can change anything like any literal; adding space or remove space. I changed value to be inserted from 1 to 2. create or replace procedure a(a number) as begin insert into t1 values(2); commit; end; / Now in the other database whenever I execute the procedure using database link it throws error ORA-04062. But subseq
Read more