增量 RMAN 备份不前滚

Question

我们刚刚从使用数据泵切换到使用 RMAN 的增量备份。我一直在滚动增量备份时遇到问题。这是我的备份脚本：

BACKUP device type disk incremental level=1 tag='T4PRO' section size 1g database plus archivelog;
backup current controlfile format='&1CONTROLFILE_%T.BKP';

和恢复：

RECOVER COPY OF DATABASE WITH TAG 'T4PRO' UNTIL TIME 'SYSDATE-3';
DELETE NOPROMPT OBSOLETE DEVICE TYPE DISK;

备份成功完成，虽然备份副本的大小似乎比我预期的要大，但这是本次讨论的一个旁白。我真正的问题是我们在第 5 天，当我运行恢复命令时仍然得到这个：

RMAN> RECOVER COPY OF DATABASE WITH TAG 'T4PRO' UNTIL TIME 'SYSDATE-3';
Starting recover at 17-JAN-18
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=133 device type=DISK
no copy of datafile 1 found to recover
no copy of datafile 2 found to recover
no copy of datafile 3 found to recover
no copy of datafile 4 found to recover
no copy of datafile 5 found to recover
Finished recover at 17-JAN-18

RMAN> DELETE NOPROMPT OBSOLETE DEVICE TYPE DISK;
RMAN retention policy will be applied to the command
RMAN retention policy is set to recovery window of 7 days
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=133 device type=DISK
no obsolete backups found

备份部分并没有像我两天前预期的那样向前滚动。以下是 SHOW ALL 命令的结果（如果它提供任何附加信息）：

RMAN> show all;
RMAN configuration parameters for database with db_unique_name T4PRO are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO 'C:\APP\ITWORKS\PRODUCT\11.2.0\DBHOME_1\D
ATABASE\SNCFT4PRO.ORA'; # default

Answer 1

检查数据文件副本是否存在：

RMAN> LIST COPY OF DATABASE;

检查是否存在带有标签“T4PRO”的数据文件副本：

RMAN> LIST COPY OF DATABASE TAG 'T4PRO';

您必须先使用BACKUP AS COPY... 进行“映像”备份，然后才能使用增量备份恢复该映像。