oceanbase.DBA_MVIEWS|V4.6.0|OceanBase Database| docs|Distributed Database

oceanbase.DBA_MVIEWS

Last Updated：2026-05-07 11:26:24 Updated

Note

This view is available starting with V4.3.0.

Purpose

The DBA_MVIEWS view displays information about all materialized views.

Columns

Column	Type	Nullable	Description
OWNER	varchar(128)	NO	The name of the owner of the materialized view.
MVIEW_NAME	varchar(128)	NO	The name of the materialized view.
CONTAINER_NAME	varchar(128)	NO	The name of the container table of the materialized view.
QUERY	longtext	NO	The query that defines the materialized view.
QUERY_LEN	bigint(20)	NO	The length of the query in bytes.
UPDATABLE	varchar(1)	NO	Indicates whether the materialized view is updatable. Y N Note This column is for compatibility only. The default value is N.
UPDATE_LOG	varchar(128)	NO	The name of the update log file for an updatable materialized view. Note This column is for compatibility only. The default value is NULL.
MASTER_ROLLBACK_SEG	varchar(128)	NO	The rollback segment of the master site or master materialized view site. Note This column is for compatibility only. The default value is NULL.
MASTER_LINK	varchar(128)	NO	The database link of the master site or master materialized view site. Note This column is for compatibility only. The default value is NULL.
REWRITE_ENABLED	varchar(1)	NO	Indicates whether rewrite is enabled. Y N
REWRITE_CAPABILITY	varchar(9)	NO	Indicates whether the materialized view meets the rewrite conditions. If the materialized view meets the rewrite conditions, it must follow the rules below: NONE: The materialized view cannot be used for rewrite because rewrite is not allowed or is blocked. TEXTMATCH: The query of the materialized view has restrictions on query rewrite. GENERAL: The query of the materialized view has no restrictions on query rewrite. Note This column is for compatibility only. The default value is NULL.
REFRESH_MODE	varchar(6)	NO	The refresh mode of the materialized view. DEMAND: The materialized view is refreshed when the refresh process is called. NEVER: The materialized view is never refreshed.
REFRESH_METHOD	varchar(8)	NO	The default method used to refresh the materialized view (can be overridden by API). COMPLETE: A full refresh. FORCE: An incremental refresh is attempted first. If an incremental refresh is not possible, a full refresh is performed. FAST: An incremental refresh. NEVER: The materialized view is never refreshed.
BUILD_MODE	varchar(9)	NO	The method used to populate the materialized view during creation. IMMEDIATE: The materialized view is populated immediately during creation. DEFERRED: The materialized view is not populated during creation. PREBUILT: The materialized view is populated with an existing table during creation.
FAST_REFRESHABLE	varchar(18)	NO	Indicates whether the materialized view is suitable for incremental (fast) refresh. NO: The materialized view cannot be fast-refreshed and is therefore complex. DML: Only DML operations support fast refresh. Note This column is for compatibility only. The default value is NULL.
LAST_REFRESH_TYPE	varchar(8)	NO	The method used for the last refresh. COMPLETE: A full refresh. FAST: An incremental refresh. NA: The materialized view has not been refreshed yet (for example, when it is created with a delay).
LAST_REFRESH_DATE	datetime	YES	The date when the materialized view was last refreshed.
LAST_REFRESH_END_TIME	datetime	NO	The end time of the last refresh of the materialized view.
STALENESS	varchar(19)	NO	The relationship between the content of the materialized view and the content of the materialized view master. FRESH: The materialized view is a read-consistent view of the current state of its master object. IMPORT: The materialized view is imported from another database (the value of the UNKNOWN_IMPORT column is Y). Therefore, it is unknown whether the materialized view is a read-consistent view of the master view at any point in time. After a full refresh, the STALENESS value of this view will change to FRESH. NEEDS_COMPILE: Some objects that the materialized view depends on have changed. You need to execute the ALTER MATERIALIZED VIEW...COMPILE statement to verify the materialized view and calculate the staleness. STALE: The materialized view is outdated because one or more of its master objects have changed. If the materialized view was previously FRESH and then became STALE, it is a read-consistent view of the previous state of the master object. UNDEFINED: The materialized view has a remote master. The concept of staleness is not defined for such materialized views. UNKNOWN: Whether the materialized view is a read-consistent view of the master view at any point in time. UNUSABLE: The materialized view is not a read-consistent view of the master view at any point in time. Note This column is for compatibility only. The default value is NULL.
AFTER_FAST_REFRESH	varchar(19)	NO	The STALENESS value that will appear after a fast refresh is applied to this materialized view. The value of this column is the same as that of the STALENESS column. If the value is NA, it indicates that this value is used when a fast refresh is not applicable to the materialized view. Note This column is for compatibility only. The default value is NULL.
UNKNOWN_PREBUILT	varchar(1)	NO	Indicates whether the materialized view is prebuilt. Y N Note This column is for compatibility only. The default value is N.
UNKNOWN_PLSQL_FUNC	varchar(1)	NO	Indicates whether the materialized view contains PL/SQL functions. Y N Note This column is for compatibility only. The default value is N.
UNKNOWN_EXTERNAL_TABLE	varchar(1)	NO	Indicates whether the materialized view contains external tables. Y N Note This column is for compatibility only. The default value is N.
UNKNOWN_CONSIDER_FRESH	varchar(1)	NO	Indicates whether a materialized view is considered fresh. Y N Note This column is compatible only and the default value is N.
UNKNOWN_IMPORT	varchar(1)	NO	Indicates whether a materialized view is imported. Y N Note This column is compatible only and the default value is N.
UNKNOWN_TRUSTED_FD	varchar(1)	NO	Indicates whether a materialized view is refreshed by using trusted constraints. Y N Note This column is compatible only and the default value is N.
COMPILE_STATE	varchar(19)	NO	Indicates the validity of a materialized view relative to the objects on which it depends. VALID: The materialized view has been verified, has no errors, and the objects on which it depends have not changed since the last verification. NEEDS_COMPILE: Some objects on which the materialized view depends have changed. You must execute the ALTER MATERIALIZED VIEW...COMPILE statement to verify this materialized view. ERROR: The materialized view has been verified, but one or more errors exist. Note This column is compatible only and the default value is NULL.
USE_NO_INDEX	varchar(1)	NO	Indicates whether a materialized view is created by using the USING NO INDEX clause (Y) or the default index (N). The USING NO INDEX clause prevents the creation of the default index. Y N Note This column is compatible only and the default value is Y.
STALE_SINCE	datetime	NO	The start time when a materialized view becomes stale. Note This column is compatible only and the default value is NULL.
NUM_PCT_TABLES	bigint(0)	NO	The number of PCT base tables. Note This column is compatible only and the default value is NULL.
NUM_FRESH_PCT_REGIONS	bigint(0)	NO	The number of fresh PCT partition regions. Note This column is compatible only and the default value is NULL.
NUM_STALE_PCT_REGIONS	bigint(0)	NO	The number of stale PCT partition regions. Note This column is compatible only and the default value is NULL.
SEGMENT_CREATED	varchar(3)	NO	Indicates whether a materialized view is created by using the SEGMENT CREATION DEFERRED clause. YES NO Note This column is compatible only and the default value is NO.
EVALUATION_EDITION	varchar(128)	NO	The name of the version object referenced in the expression column. Note This column is compatible only and the default value is NULL.
UNUSABLE_BEFORE	varchar(128)	NO	The name of the oldest version in which the stored results of the subquery of a materialized view can be used for query rewriting. The stored results of the materialized view data in versions earlier than the specified version are considered unavailable. If no such version is specified, this value is NULL. Note This column is compatible only and the default value is NULL.
UNUSABLE_BEGINNING	varchar(128)	NO	The name of the oldest version in which the stored results of the subquery of a materialized view cannot be used for query rewriting. In the specified version and any of its descendants, the data cannot be used for query rewriting. If no such version is specified, this value is NULL. Note This column is compatible only and the default value is NULL.
DEFAULT_COLLATION	varchar(100)	NO	The default collation of a materialized view. Note This column is compatible only and the default value is NULL.
ON_QUERY_COMPUTATION	varchar(1)	NO	Indicates whether a materialized view is a real-time materialized view. Y N
REFRESH_DOP	bigint(20)	NO	The parallelism of the background refresh of a materialized view. The default value is 0. Note When you create a materialized view, you can specify this value by using the `PARALLEL` attribute. You can also modify this value by using the `ALTER MATERIALIZED VIEW` statement. If you do not explicitly set `PARALLEL` (the default value of `REFRESH_DOP` is 0), the background refresh parallelism depends on the global system variable `mview_refresh_dop`. For OceanBase Database V4.3.5, this column is available starting from V4.3.5 BP1.
DATA_SYNC_SCN	bigint(20) unsigned	NO	The data SCN of a materialized view. Note For OceanBase Database V4.3.5, this column is available starting from V4.3.5 BP2.
DATA_SYNC_DELAY	varchar(128)	NO	The data synchronization delay of a materialized view, in seconds. Note For OceanBase Database V4.3.5, this column is available starting from V4.3.5 BP2.

Sample query

Query all materialized views and display the first record.

obclient [(none)]> SELECT * FROM oceanbase.DBA_MVIEWS LIMIT 1\G

The query result is as follows:

*************************** 1. row ***************************
                 OWNER: test
            MVIEW_NAME: mv1_tbl3_tbl4
        CONTAINER_NAME: mv1_tbl3_tbl4
                 QUERY: select `test`.`tbl3`.`id` AS `id1`,`test`.`tbl4`.`id` AS `id2`,`test`.`tbl3`.`name` AS `name`,`test`.`tbl4`.`age` AS `age` from `test`.`tbl3`,`test`.`tbl4` where (`test`.`tbl3`.`id` = `test`.`tbl4`.`id`)
             QUERY_LEN: 203
             UPDATABLE: N
            UPDATE_LOG: NULL
   MASTER_ROLLBACK_SEG: NULL
           MASTER_LINK: NULL
       REWRITE_ENABLED: N
    REWRITE_CAPABILITY: NULL
          REFRESH_MODE: DEMAND
        REFRESH_METHOD: COMPLETE
            BUILD_MODE: IMMEDIATE
      FAST_REFRESHABLE: NULL
     LAST_REFRESH_TYPE: COMPLETE
     LAST_REFRESH_DATE: 2025-04-22 17:39:46
 LAST_REFRESH_END_TIME: 2025-04-22 17:39:46
             STALENESS: NULL
    AFTER_FAST_REFRESH: NULL
      UNKNOWN_PREBUILT: N
    UNKNOWN_PLSQL_FUNC: N
UNKNOWN_EXTERNAL_TABLE: N
UNKNOWN_CONSIDER_FRESH: N
        UNKNOWN_IMPORT: N
    UNKNOWN_TRUSTED_FD: N
         COMPILE_STATE: NULL
          USE_NO_INDEX: Y
           STALE_SINCE: NULL
        NUM_PCT_TABLES: NULL
 NUM_FRESH_PCT_REGIONS: NULL
 NUM_STALE_PCT_REGIONS: NULL
       SEGMENT_CREATED: NO
    EVALUATION_EDITION: NULL
       UNUSABLE_BEFORE: NULL
    UNUSABLE_BEGINNING: NULL
     DEFAULT_COLLATION: NULL
  ON_QUERY_COMPUTATION: N
           REFRESH_DOP: 0
         DATA_SYNC_SCN: 1745314785636035000
       DATA_SYNC_DELAY: 61626
1 row in set

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oceanbase.DBA_MVIEWS

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Purpose

Columns

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Sample query