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If your archive log destination is full and there isn t room for more redo logs to be archived, the archiver process is said to be stuck. The database doesn t merely slow down it freezes in its tracks. As you are aware, in an archive log mode the database simply won t overwrite redo log files until they re archived successfully. Thus, the database starts hanging when the archive log directory is full. It stays in that mode until you move some of the archive logs off that directory manually.

The DBMS_SPACE package has three main procedures. The UNUSED_SPACE procedure gives you information about the unused space in an object segment, the FREE_BLOCKS procedure gives you information about the number of free blocks in a segment, and the SPACE_USAGE procedure gives you details about space usage in the blocks. Let s look at the UNUSED_SPACE procedure closely and see how you can use it to get detailed unused space information. The procedure has three IN parameters (a fourth one is a default parameter) and seven OUT parameters. Listing 24-14 shows the output from the execution of the UNUSED_SPACE procedure. Listing 24-14. Using the DBMS_SPACE.FREE_SPACE Procedure DECLARE v_total_blocks NUMBER; v_total_bytes NUMBER; v_unused_blocks NUMBER; v_unused_bytes NUMBER; v_last_used_extent_file_id NUMBER; v_last_used_extent_block_id NUMBER; v_last_used_block NUMBER; BEGIN dbms_space.unused_space (segment_owner => 'OE', segment_name => 'PRODUCT_DESCRIPTIONS', segment_type => 'TABLE', total_blocks => v_total_blocks, total_bytes => v_total_bytes, unused_blocks => v_unused_blocks, unused_bytes => v_unused_bytes, last_used_extent_file_id => v_last_used_extent_file_id, last_used_extent_block_id => v_last_used_extent_block_id, last_used_block => v_last_used_block, partition_name => NULL); dbms_output.put_line ('Number of Total Blocks : '||v_total_blocks); 22 dbms_output.put_line ('Number of Bytes : '||v_total_bytes); 23 dbms_output.put_line ('Number of Unused Blocks : '||v_unused_blocks); 24 dbms_output.put_line ('Number of unused Bytes : '||v_unused_bytes ); 25 END; Number of Total Blocks : 384 Number of Bytes : 3145728 Number of Unused Blocks : 0 Number of unused Bytes : 0 PL/SQL procedure successfully completed. SQL> SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

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The archiver process is in charge of archiving the filled redo logs. It reads the control files to find out if there are any unarchived redo logs that are full, and then it checks the redo log headers and blocks to make sure they re valid before archiving them. You may have archiving-related problems if you re in the archive log mode but the archiver process isn t running for some reason. In this case, you need to start the archiver process by using the following command: SQL> ALTER SYSTEM ARCHIVE LOG START; If the archiver process is running but the redo logs aren t being archived, then you may have a problem with the archive log destination, which may be full. This causes the archiver process to become stuck, as you ll learn in the next section.

Contrary to what its name suggests, this package won t help you administer space within the Oracle database. You use the DBMS_SPACE_ADMIN package mostly to manage the locally managed tablespaces. The package has several procedures, as shown in Listing 24-15.

When the archiver process is stuck, all database transactions that involve any changes to the tables can t proceed any further. You can still perform SELECT operations, because they don t involve the redo logs. If you look in the alert log, you can see the Oracle error messages indicating that the archiver process is stuck due to lack of disk space. You can also query the V$ARCHIVE view, which holds information about all the redo logs that need archiving. If the number of these logs is high and increasing quickly, you know your archiver process is stuck and that you need to clear it manually. Listing 20-20 shows the error messages you ll see when the archiver process is stuck. Listing 20-20. Database Hang Due to Archive Errors $ sqlplus system/system_passwd ERROR: ORA-00257: archiver error. Connect internal only, until freed. $ $ oerr ora 257 00257, 00000, "archiver error. Connect internal only, until freed." //*Cause: The archiver process received an error while trying to // archive a redo log. If the problem is not resolved soon, the // database will stop executing transactions. The most likely cause // of this message is the destination device is out of space to // store the redo log file. // *Action: Check archiver trace file for a detailed description // of the problem. Also verify that the device specified in the // initialization parameter ARCHIVE_LOG_DEST is set up properly for // archiving. $

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