RMAN-08138: WARNING: archived log not deleted - must create more backups
*Cause: An archived log that should have been deleted was not as it
it did not meet the user specified archive log deletion policy
of number of backups required before deleting the logs.
*Action: This is an informational message. The archived log can be
deleted after more backups are created to satify archivelog
delete noprompt archivelog ALL BACKED UP 1 TIMES TO SBT_TAPE COMPLETED BEFORE ="SYSDATE-1/2";
CONFIGURE RETENTION POLICY TO recovery window of 14 days;
In addition, $ in a RMAN script can lead to problem.