您可以通过视图查看归档的历史信息，包括当前正在进行的归档信息。

系统租户查看集群中所有租户的归档历史

sys 租户可以通过  oceanbase.CDB_OB_ARCHIVELOG_SUMMARY 视图查看集群中所有租户的归档历史信息。

1. 使用  root 用户登录数据库的  sys 租户。

2. 执行以下语句，查看集群所有租户的归档历史信息。

   obclient> SELECT * FROM oceanbase.CDB_OB_ARCHIVELOG_SUMMARY\G
   *************************** 1. row ***************************
                      TENANT_ID: 1002
                        DEST_ID: 2
                       ROUND_ID: 2
                    INCARNATION: 1
                        DEST_NO: 0
                         STATUS: DOING
                      START_SCN: 1655697600000000000
              START_SCN_DISPLAY: 2022-06-20 12:00:00.000000
                 CHECKPOINT_SCN: 1655769600000000000
         CHECKPOINT_SCN_DISPLAY: 2022-06-21 08:00:00.000000
                     COMPATIBLE: 1
                  BASE_PIECE_ID: 4
                  USED_PIECE_ID: 4
          PIECE_SWITCH_INTERVAL: 1d
                    INPUT_BYTES: 16106127360
            INPUT_BYTES_DISPLAY: 15.00GB
                   OUTPUT_BYTES: 7516192768
           OUTPUT_BYTES_DISPLAY: 7.00GB
              COMPRESSION_RATIO: 1.00
            DELETED_INPUT_BYTES: 0
    DELETED_INPUT_BYTES_DISPLAY: 0.00MB
           DELETED_OUTPUT_BYTES: 0
   DELETED_OUTPUT_BYTES_DISPLAY: 0.00MB
                        COMMENT:
                           PATH: file:///data/nfs/backup/archive
   *************************** 2. row ***************************
                      TENANT_ID: 1002
                        DEST_ID: 2
                       ROUND_ID: 1
                    INCARNATION: 1
                        DEST_NO: 0
                         STATUS: STOP
                      START_SCN: 1654034400000000000
              START_SCN_DISPLAY: 2022-06-01 06:00:00.000000
                 CHECKPOINT_SCN: 1654228800000000000
         CHECKPOINT_SCN_DISPLAY: 2022-06-03 12:00:00.000000
                     COMPATIBLE: 1
                  BASE_PIECE_ID: 1
                  USED_PIECE_ID: 3
          PIECE_SWITCH_INTERVAL: 1d
                    INPUT_BYTES: 96636764160
            INPUT_BYTES_DISPLAY: 90.00GB
                   OUTPUT_BYTES: 42949672960
           OUTPUT_BYTES_DISPLAY: 40.00GB
              COMPRESSION_RATIO: 1.00
            DELETED_INPUT_BYTES: 26843545600
    DELETED_INPUT_BYTES_DISPLAY: 25.00GB
           DELETED_OUTPUT_BYTES: 26843545600
   DELETED_OUTPUT_BYTES_DISPLAY: 25.00GB
                        COMMENT:
                           PATH: file:///data/nfs/backup/archive
   *************************** 3. row ***************************
                      TENANT_ID: 1004
                        DEST_ID: 1
                       ROUND_ID: 1
                    INCARNATION: 1
                        DEST_NO: 0
                         STATUS: DOING
                      START_SCN: 1655658000000000000
              START_SCN_DISPLAY: 2022-06-20 01:00:00.000000
                 CHECKPOINT_SCN: 1655769600000000000
         CHECKPOINT_SCN_DISPLAY: 2022-06-21 08:00:00.000000
                     COMPATIBLE: 1
                  BASE_PIECE_ID: 1
                  USED_PIECE_ID: 2
          PIECE_SWITCH_INTERVAL: 1d
                    INPUT_BYTES: 161061273600
            INPUT_BYTES_DISPLAY: 150.00GB
                   OUTPUT_BYTES: 32212254720
           OUTPUT_BYTES_DISPLAY: 30.00GB
              COMPRESSION_RATIO: 1.00
            DELETED_INPUT_BYTES: 0
    DELETED_INPUT_BYTES_DISPLAY: 0.00MB
           DELETED_OUTPUT_BYTES: 0
   DELETED_OUTPUT_BYTES_DISPLAY: 0.00MB
                        COMMENT:
                           PATH: oss://oceanbase-test-bucket/backup/archive?host=xxx.aliyun-inc.com
   3 row in set

上面的示例中，当前集群中有租户 ID 为  1002 和  1004 的 2 个租户的归档信息。其中， 1002 租户是第二次开启归档，有 2 轮归档信息。 1004 租户是首次开启归档，只有当前的归档信息。

1002 租户的第一轮归档产生了 3 个 Piece，  piece id 分别是 1~ 3，归档日志的范围是  '2022-06-01 06:00:00.000000' ~  '2022-06-03 12:00:00.000000' 。已被归档的原始日志数据量是  90GB ，经过压缩之后的实际归档数据量是  40GB ，压缩率是 2.25。而且，有  10GB 的实际归档数据已被清理，该部分被清理的数据压缩前的数据量是  25GB 。

1004 租户的  round_id 是  1，表明是首次开启归档，归档介质的类型是  OSS，存储桶是  oceanbase-test-bucket ，路径是  /backup/archive 。 自开启归档以来共产生了 2 个 Piece，  piece id 分别是  1 和  2，已归档日志的范围是  '2022-06-20 01:00:00.000000' ~  '2022-06-21 08:00:00.000000' ，原始日志数据量是  150GB ，经过压缩之后的实际归档数据量是  30GB ，压缩率是 5。

更多  CDB_OB_ARCHIVELOG_SUMMARY 视图的说明，请参见  CDB_OB_ARCHIVELOG_SUMMARY。

用户租户查看当前租户的归档历史

用户租户可以通过  oceanbase.DBA_OB_ARCHIVELOG_SUMMARY 视图（MySQL 模式）和  sys.DBA_OB_ARCHIVELOG_SUMMARY 视图（Oracle 模式）查看本租户的归档历史。

1. 用户租户的租户管理员登录到对应的租户。

   说明

   MySQL 租户的管理员用户为  root 用户，Oracle 租户的管理员用户为  SYS 用户。

2. 执行以下语句，查看本租户的日志归档历史。

   MySQL 租户查看本租户日志归档历史的示例如下：

   obclient> SELECT * FROM oceanbase.DBA_OB_ARCHIVELOG_SUMMARY\G
   *************************** 1. row ***************************
                        DEST_ID: 2
                       ROUND_ID: 2
                    INCARNATION: 1
                        DEST_NO: 0
                         STATUS: DOING
                      START_SCN: 1655697600000000000
              START_SCN_DISPLAY: 2022-06-20 12:00:00.000000
                 CHECKPOINT_SCN: 1655769600000000000
         CHECKPOINT_SCN_DISPLAY: 2022-06-21 08:00:00.000000
                     COMPATIBLE: 1
                  BASE_PIECE_ID: 4
                  USED_PIECE_ID: 4
          PIECE_SWITCH_INTERVAL: 1d
                    INPUT_BYTES: 16106127360
            INPUT_BYTES_DISPLAY: 15.00GB
                   OUTPUT_BYTES: 7516192768
           OUTPUT_BYTES_DISPLAY: 7.00GB
              COMPRESSION_RATIO: 1.00
            DELETED_INPUT_BYTES: 0
    DELETED_INPUT_BYTES_DISPLAY: 0.00MB
           DELETED_OUTPUT_BYTES: 0
   DELETED_OUTPUT_BYTES_DISPLAY: 0.00MB
                        COMMENT:
                           PATH: file:///data/nfs/backup/archive
   *************************** 2. row ***************************
                        DEST_ID: 2
                       ROUND_ID: 1
                    INCARNATION: 1
                        DEST_NO: 0
                         STATUS: STOP
                      START_SCN: 1654034400000000000
              START_SCN_DISPLAY: 2022-06-01 06:00:00.000000
                 CHECKPOINT_SCN: 1654228800000000000
         CHECKPOINT_SCN_DISPLAY: 2022-06-03 12:00:00.000000
                     COMPATIBLE: 1
                  BASE_PIECE_ID: 1
                  USED_PIECE_ID: 3
          PIECE_SWITCH_INTERVAL: 1d
                    INPUT_BYTES: 96636764160
            INPUT_BYTES_DISPLAY: 90.00GB
                   OUTPUT_BYTES: 96636764160
           OUTPUT_BYTES_DISPLAY: 90.00GB
              COMPRESSION_RATIO: 1.00
            DELETED_INPUT_BYTES: 32212254720
    DELETED_INPUT_BYTES_DISPLAY: 30.00GB
           DELETED_OUTPUT_BYTES: 32212254720
   DELETED_OUTPUT_BYTES_DISPLAY: 30.00GB
                        COMMENT:
                           PATH: file:///data/nfs/backup/archive
   2 row in set