archivelogRecordSpecifier

Syntax

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archlogRange::=

Text description of the illustration archlogr.gif

Purpose

A subclause used to specify an archived log or range of archived redo logs files for use in backup, restore, and maintenance operations.

When backing up archived redo logs, RMAN can perform archived log failover automatically. RMAN backs up the log when at least one archived log corresponding to a given log sequence number and thread is available. Also, if the copy that RMAN is backing up contains corrupt blocks, then it searches for good copies of these blocks in other copies of the same archived logs.

Specifying a range of archived redo logs does not guarantee that RMAN includes all redo data in the range: for example, the last available archived log file may end before the end of the range, or an archived log file in the range may be missing from all archiving destinations. RMAN includes the archived redo logs it finds and does not issue a warning for missing files.

Note: Query the V$ARCHIVED_LOG view or RC_ARCHIVED_LOG recovery catalog view to determine the time stamps, SCNs, and log sequence numbers for an archived log. For information on how to use the NLS_LANG and NLS_DATE_FORMAT environment variables to specify the format for the time, see Oracle9i Database Reference.

Keywords and Parameters

ALL	Specifies all available archived logs.
LIKE 'string_pattern'	Specifies all archived logs that match the specified string_pattern. The same pattern matching characters that are valid in the LIKE operator in the SQL language can be used to match multiple files. See Also: Oracle9i Recovery Manager User's Guide to learn how to make archived log backups in an Oracle Real Application Clusters configuration, and Oracle9i Real Application Clusters Administration for more information about the Oracle Real Application Clusters configuration
UNTIL TIME = 'date_string'	Specifies the end date for a sequence of archived redo log files. The time specified in the string must be formatted according to the Globalization Technology date format specification currently in effect, but can also be any SQL expression with the same datatype, such as SYSDATE. The TO_DATE function can be used to specify hard-coded dates that work regardless of the current Globalization Technology settings. If you do not specify the FROM TIME parameter, then the beginning time for the sequence will be the earliest available archived redo log. See Also: Oracle9i Database Reference for information on how to use the NLS_LANG and NLS_DATE_FORMAT environment variables to specify the format for the time
FROM TIME = 'date_string'	Specifies the beginning date for a sequence of archived redo log files. The time specified in the string must be formatted according to the Globalization Technology date format specification currently in effect, but can also be any SQL expression with the same datatype, such as SYSDATE. The TO_DATE function can be used to specify hard-coded dates that work regardless of the current Globalization Technology settings. If you do not specify the UNTIL TIME parameter, RMAN will include all available log files beginning with the date specified in the FROM TIME parameter.Use the V$ARCHIVED_LOG data dictionary view to determine the time stamps for the first and last entries in a log file. See Also: Oracle9i Database Reference for information on how to use the NLS_LANG and NLS_DATE_FORMAT environment variables to specify the format for the time
TIME BETWEEN 'date_string' AND 'date_string'	Specifies a range of times. Note that TIME BETWEEN 'date_string' AND 'date_string' is exactly equivalent to FROM TIME 'date_string' UNTIL TIME 'date_string'.
UNTIL SCN = integer	Specifies the ending SCN for a sequence of archived redo log files. If you do not specify the FROM SCN parameter, then RMAN will start with the earliest available archived log.
SCN BETWEEN integer AND integer	Specifies a range of SCNs. SCN BETWEEN integer1 AND integer2 is exactly equivalent to FROM SCN integer1 UNTIL SCN integer2.
FROM SCN = integer	Specifies the beginning SCN for a sequence of archived redo log files. If you do not specify the UNTIL SCN parameter, RMAN will include all available log files beginning with SCN specified in the from SCN parameter.
UNTIL SEQUENCE = integer	Specifies the terminating log sequence number for a sequence of archived redo log files. If you do not specify the FROM SEQUENCE parameter, RMAN uses the lowest available log sequence number to begin the sequence.
FROM SEQUENCE integer	Specifies the beginning log sequence number for a sequence of archived redo log files. If you do not specify the UNTIL SEQUENCE parameter, RMAN will include all available log files beginning with log sequence number specified in the FROM SEQUENCE parameter. Note: You can specify all log sequence numbers in a thread by using the following syntax, where thread_number is an integer referring to the thread: ... ARCHIVELOG FROM SEQUENCE 0 THREAD thread_number
SEQUENCE	Specifies either a single log sequence number or a range of sequence numbers.
	integer	Specifies a single log sequence number.
	BETWEEN integer AND integer	Specifies a range of log sequence numbers. SEQUENCE BETWEEN integer1 AND integer2 is exactly equivalent to FROM SEQUENCE integer1 UNTIL SEQUENCE integer2.
THREAD = integer	Specifies the thread containing the archived redo log files you wish to include. You only need to specify this parameter when running the database in an Oracle Real Application Clusters configuration. THREAD is only valid when SEQUENCE is also specified. Note also that although the SEQUENCE parameter does not require that THREAD be specified, a given log sequence always implies a thread. The thread defaults to 1 if not specified. Query V$ARCHIVED_LOG to check the thread number for an archived log.

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Examples

Specifying Records by Time: Example

This example deletes all archived redo logs older than two weeks:

DELETE ARCHIVELOG ALL UNTIL TIME 'SYSDATE-14';

Specifying Records by SCN: Example

This example restores backup archived redo log files from tape that fall within a range of SCNs:

RESTORE ARCHIVELOG SCN BETWEEN 500 AND 700;

Specifying a Single Log Sequence Number: Example

This example backs up only archived log 1372 of thread 1 and then deletes it.

BACKUP ARCHIVELOG SEQUENCE 1372 DELETE INPUT;

Specifying a Range of Records by Log Sequence Number: Example

This example backs up all archived logs from sequence 288 to sequence 301 on thread 1 and deletes the archived logs after the backup is complete. If the backup fails, the logs are not deleted.

RUN
{
  ALLOCATE CHANNEL dev1 DEVICE TYPE sbt;
  BACKUP ARCHIVELOG 
    SEQUENCE BETWEEN 288 AND 301 THREAD 1
    # delete original archived redo logs after backup completes
    DELETE INPUT;
}

Specifying All Log Sequence Numbers in a Thread

This example crosschecks all archived redo logs in thread 1:

CROSSCHECK ARCHIVELOG FROM SEQUENCE 0 THREAD 1;