Naming of archivelog files with non existing top level archivelog directory

In Oracle 12.2 an archive log directory is accepted, if top level directory does not exist:

oracle@localhost:/u01/app/oracle/product/12.2.0/dbhome_1/dbs/ [DMK] ls -l /u02/oradata/DMK/
 total 2267920
 drwxr-xr-x. 2 oracle dba        96 Dec  6 05:36 arch ...

Now database accepts this non existing archivelog destination:

SQL> alter system set log_archive_dest_3='LOCATION=/u02/oradata/DMK/arch/arch2';

System altered.

But not this:

SQL> alter system set log_archive_dest_4='LOCATION=/u02/oradata/DMK/arch/arch2/arch4';
 alter system set log_archive_dest_4='LOCATION=/u02/oradata/DMK/arch/arch2/arch4'
 *
 ERROR at line 1:
 ORA-02097: parameter cannot be modified because specified value is invalid
 ORA-16032: parameter LOG_ARCHIVE_DEST_4 destination string cannot be translated
 ORA-07286: sksagdi: cannot obtain device information.
 Linux-x86_64 Error: 2: No such file or directory

Log file format is set as following:

SQL> show parameter log_archive_format;

NAME                                 TYPE        VALUE
 ------------------------------------ ----------- ------------------------------
 log_archive_format                   string      %t_%s_%r.dbf
 SQL>

Now let’s see how archive log files look like in log_archive_dest_3:

oracle@localhost:/u01/app/oracle/product/12.2.0/dbhome_1/dbs/ [DMK] ls -l /u02/oradata/DMK/arch/arch2*
 -rw-r-----. 1 oracle dba 3845120 Dec  6 05:36 /u02/oradata/DMK/arch/arch21_5_960106002.dbf

So Oracle just adds the non existing top level directory to beginning of archivelog filename.

Cet article Naming of archivelog files with non existing top level archivelog directory est apparu en premier sur Blog dbi services.