清理RMAN备份中的过期数据

　　查看过期备份

　　RMAN> report obsolete;

　　RMAN retention policy will be applied to the command

　　RMAN retention policy is set to redundancy 1

　　Report of obsolete backups and copies

　　Type     Key    Completion Time    Filename/Handle

　　-------------------- ------ ------------------ --------------------

　　Backup Set     117    01-MAR-10

　　Backup Piece 117    01-MAR-10    /backup/database/arch_ATYU30_3pl7egjp_121_1.dbf

　　Backup Set     116    01-MAR-10

　　Backup Piece 116    01-MAR-10    /backup/database/arch_ATYU30_3ql7egjp_122_1.dbf

　　Backup Set     121    02-MAR-10

　　Backup Piece 121    02-MAR-10    /backup/database/dbfull_ATYU30_3sl7h4ne_124_1.dbf

　　Backup Set     120    02-MAR-10

　　Backup Piece 120    02-MAR-10    /backup/database/dbfull_ATYU30_3tl7h4ne_125_1.dbf

　　Backup Set     119    02-MAR-10

　　Backup Piece 119    02-MAR-10    /backup/database/dbfull_ATYU30_3ul7h4ne_126_1.dbf

　　Backup Set     122    02-MAR-10

　　Backup Piece 122    02-MAR-10    /backup/database/ctl_ATYU30_127_1_712545206.dbf

　　Backup Set     125    02-MAR-10

　　Backup Piece 125    02-MAR-10    /backup/database/arch_ATYU30_41l7h4u8_129_1.dbf

　　Backup Set     124    02-MAR-10

　　Backup Piece 124    02-MAR-10    /backup/database/arch_ATYU30_42l7h4u8_130_1.dbf

　　Backup Set     133    03-MAR-10

　　Backup Piece 133    03-MAR-10    /backup/database/dbfull_ATYU30_48l7jp3f_136_1.dbf

　　Backup Set     131    03-MAR-10

　　Backup Piece 131    03-MAR-10    /backup/database/dbfull_ATYU30_49l7jp3f_137_1.dbf

　　Backup Set     132    03-MAR-10

　　Backup Piece 132    03-MAR-10    /backup/database/dbfull_ATYU30_4al7jp3f_138_1.dbf

　　Backup Set     134    03-MAR-10

　　Backup Piece 134    03-MAR-10    /backup/database/ctl_ATYU30_139_1_712631951.dbf

　　Backup Set     137    03-MAR-10

　　Backup Piece 137    03-MAR-10    /backup/database/arch_ATYU30_4dl7jplb_141_1.dbf

　　Backup Set     136    03-MAR-10

　　Backup Piece 136    03-MAR-10    /backup/database/arch_ATYU30_4el7jplb_142_1.dbf

　　Backup Set     141    04-MAR-10

　　Backup Piece 141    04-MAR-10    /backup/database/dbfull_ATYU30_4gl7mdfe_144_1.dbf

　　Backup Set     139    04-MAR-10

　　Backup Piece 139    04-MAR-10    /backup/database/dbfull_ATYU30_4hl7mdfe_145_1.dbf

　　Backup Set     140    04-MAR-10

　　Backup Piece 140    04-MAR-10    /backup/database/dbfull_ATYU30_4il7mdfe_146_1.dbf

　　Backup Set     142    04-MAR-10

　　Backup Piece 142    04-MAR-10    /backup/database/ctl_ATYU30_147_1_712718390.dbf

　　Backup Set     145    04-MAR-10

　　Backup Piece 145    04-MAR-10    /backup/database/arch_ATYU30_4ll7me2h_149_1.dbf

　　Backup Set     144    04-MAR-10

　　Backup Piece 144    04-MAR-10    /backup/database/arch_ATYU30_4ml7me2h_150_1.dbf

　　Backup Set     149    05-MAR-10

　　Backup Piece 149    05-MAR-10    /backup/database/dbfull_ATYU30_4ol7p1re_152_1.dbf

　　Backup Set     147    05-MAR-10

　　Backup Piece 147    05-MAR-10    /backup/database/dbfull_ATYU30_4pl7p1re_153_1.dbf

　　Backup Set     148    05-MAR-10

　　Backup Piece 148    05-MAR-10    /backup/database/dbfull_ATYU30_4ql7p1re_154_1.dbf

　　Backup Set     150    05-MAR-10

　　Backup Piece 150    05-MAR-10    /backup/database/ctl_ATYU30_155_1_712804786.dbf

　　Backup Set   &