3.3 RELEASE CHANNEL
Purpose
Use the RELEASE CHANNEL command to release a normal or maintenance channel while maintaining a connection to a target database instance. A normal channel is allocated with ALLOCATE CHANNEL, whereas a maintenance channel is allocated with ALLOCATE CHANNEL FOR MAINTENANCE.
Prerequisites
To release a normal channel, use the syntax shown in the release::= diagram. Execute this form of RELEASE CHANNEL only within a RUN command and specify the channel name with the same identifier used in the ALLOCATE CHANNEL command.
To release a maintenance channel, use the syntax shown in the releaseForMaint::= diagram. Execute this form of RELEASE CHANNEL only at the RMAN prompt, not within a RUN command.
Usage Notes
Maintenance channels are unaffected by ALLOCATE CHANNEL and RELEASE CHANNEL commands issued within a RUN command.
Using RELEASE CHANNEL to release channels within RUN is optional, because RMAN automatically releases all normal channels when a RUN command terminates.
Syntax
release::=
releaseForMaint::=
Semantics
| Syntax Element | Description |
|---|---|
|
|
Specifies the case-sensitive channel ID used in the |
Examples
Example 3-15 Releasing a Channel Allocated in a RUN Command
This example allocates an SBT channel named ch1 with parameters for a set of tapes intended for daily backups, backs up the database, and then releases this channel. The example then allocates an SBT channel named ch1 with parameters for a set of tapes intended for weekly backups, and makes another database backup:
RUN
{
ALLOCATE CHANNEL ch1 DEVICE TYPE sbt
PARMS='ENV=(OB_MEDIA_FAMILY=daily_bkp)';
BACKUP DATABASE;
RELEASE CHANNEL ch1;
ALLOCATE CHANNEL ch1 DEVICE TYPE sbt
PARMS='ENV=(OB_MEDIA_FAMILY=weekly_bkp)';
BACKUP DATABASE;
}
A RELEASE CHANNEL command at the end of the RUN command is optional because RMAN automatically releases channel ch1.
Example 3-16 Releasing a Maintenance Channel
This example shows the transcript of an RMAN session. The example allocates an SBT maintenance channel and then crosschecks and deletes backups on tape. After the SBT channel is released, RMAN uses the default disk channel to back up the database.
RMAN> ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE sbt; allocated channel: ORA_MAINT_SBT_TAPE_1 channel ORA_MAINT_SBT_TAPE_1: SID=105 device type=SBT_TAPE channel ORA_MAINT_SBT_TAPE_1: Oracle Secure Backup RMAN> CROSSCHECK BACKUP; crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=1jiah8ln_1_1 RECID=25 STAMP=615031479 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=1kiah8pk_1_1 RECID=26 STAMP=615031612 crosschecked backup piece: found to be 'AVAILABLE' backup piece handle=1niah973_1_1 RECID=28 STAMP=615032036 Crosschecked 3 objects RMAN> DELETE BACKUP; List of Backup Pieces BP Key BS Key Pc# Cp# Status Device Type Piece Name ------- ------- --- --- ----------- ----------- ---------- 1333 1331 1 1 AVAILABLE SBT_TAPE 1jiah8ln_1_1 1334 1332 1 1 AVAILABLE SBT_TAPE 1kiah8pk_1_1 1427 1423 1 1 AVAILABLE SBT_TAPE 1niah973_1_1 Do you really want to delete the above objects (enter YES or NO)? YES deleted backup piece backup piece handle=1jiah8ln_1_1 RECID=25 STAMP=615031479 deleted backup piece backup piece handle=1kiah8pk_1_1 RECID=26 STAMP=615031612 deleted backup piece backup piece handle=1niah973_1_1 RECID=28 STAMP=615032036 Deleted 3 objects RMAN> RELEASE CHANNEL; released channel: ORA_MAINT_SBT_TAPE_1 RMAN> BACKUP DATABASE; Starting backup at 20-FEB-13 allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=105 device type=DISK channel ORA_DISK_1: starting full datafile backup set channel ORA_DISK_1: specifying datafile(s) in backup set