How to query archive status in oracle

How to query the archive status of oracle: 1. Use the "select name, log_mode from v$database;" statement to view the current archive status of the database; 2. Log in with "sysdba" and use the "archive log list" statement to view The status of the archive.

The operating environment of this tutorial: Windows 10 system, Oracle 11g version, Dell G3 computer.

How to query the archive status of Oracle

Check whether the Oracle database is archived and modify the archive mode

Oracle is divided into non-archive mode (NOARCHIVELOG) and archive mode (ARCHIVELOG). Non-archive mode does not generate archive logs. Although it saves hard disk space, the backup solution options are very limited, and usually only cold backup can be selected. Restore can only restore the data at the time of backup, and is usually only used during development (it is said to be also used in data warehouses). Oracle installation defaults to non-archive mode. In a production environment, we should use the archive mode, which will generate archive logs and can use a variety of backup and restore solutions. Changing the mode is an inevitable choice for Oracle administrators.

First check the existing mode of the database, you can use the following statement

select name,log_mode from v$database;

You can also use the following statement

archive log list；(该方法需要as sysdba)

For the database in non-archive mode, it should be in archive mode (mainly Oracle 10g for reference) use the following steps:

 SQL> alter system set log_archive_dest_1='location=/oracle/oracle10g/log/archive_log';

The meaning of this statement is to determine the path of the archive log. In fact, Oracle 10g can generate multiple copies of the same log and save it in multiple locations to prevent accidents

For example, to add another log location, use the following statement

SQL>alter system set log_archive_dest_2='location=/oracle/oracle10g/log2/archive_log';

2. Close the database

SQL> shutdown immediate

3. Start the data mount state:

SQL> startup mount;

4. Modify the database to archive mode :

SQL> alter database archivelog;

5. Open the database and query:

SQL> alter database open;

Modify the log file naming format:

SQL> alter system set log_archive_max_processes = 5;
SQL> alter system set log_archive_format = "archive_%t_%s_%r.log" scope=spfile;

After the modification is completed, you can check whether the log mode has been modified successfully!

It is particularly pointed out that in Oracle 9i, the parameter alter system set log_archive_start = true must be modified to take effect. This parameter has been abolished in Oracle 10g, so there is no need to set this parameter.

Automatic archiving is disabled by default. You need to modify parameter log_archive_start=TRUE to enable automatic archiving.

SQL> show parameter log_archive_start
NAME TYPE value
------------------------------------ ----------- ------------------------------
log_archive_start boolean FALSE
SQL> archive log list

Database log mode archive mode

Automatic archiving disabled

Archive end point /oracle/oracle9i/u01/product/9201/dbs/arch

Earliest Summary log sequence 18

Next archived log sequence 19

Current log sequence 20

SQL> alter system set log_archive_start=TRUE scope=spfile;

The system has changed.

SQL> startup force
ORACLE 例程已经启动。
Total System Global Area 320308312 bytes
Fixed Size 730200 bytes
Variable Size 285212672 bytes
Databa

Recommended tutorial: "Oracle Video Tutorial"

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