Configure command is used in RMAN. This is used to configure the parameters for the RMAN database to work while taking backups and doing recoveries.Like:
1. configure controlfile autobackup on;
2. configure retention policy to redundancy 2;

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show all; command at RMAN will show all configure command in default or update configuration mode
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CONFIGURE allows you to set options and have the setting stick around (persistence)
common things to set:
SNAPSHOT CONTROLFILE NAME
RETENTION POLICY
CHANNEL DEVICE TYPE
CONTROLFILE AUTOBACKUP
See what is set (or standing default values now)
SHOW ALL;
assumes the use of a recovery catalog
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