首批通过分布式安全可靠测评，为关键业务系统打造
查询物化视图
更新时间：2024-08-09 23:00:00
编辑
分享
本节主要介绍物化视图的查看方法。
查看物化视图定义
使用 SHOW CREATE TABLE 语句查看物化视图定义。
示例如下：
查看物化视图 mv_tbl1 的定义。
obclient [SYS]> SHOW CREATE TABLE mv_tbl1;
返回结果如下：
+---------+---------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+
| VIEW | CREATE VIEW | CHARACTER_SET_CLIENT | COLLATION_CONNECTION |
+---------+---------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+
| MV_TBL1 | CREATE MATERIALIZED VIEW "MV_TBL1" AS select "SYS"."TBL1"."ID" AS "ID","SYS"."TBL1"."NAME" AS "NAME" from "SYS"."TBL1" where ("SYS"."TBL1"."AGE" >= 20) | utf8mb4 | utf8mb4_bin |
+---------+---------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+
1 row in set
使用视图查看物化视图信息
可以通过系统视图来查看物化视图的相关信息，可查看的视图有：
| 视图名 | 功能描述 |
|---|---|
| ALL_MVIEWS | 展示物化视图信息。 |
| DBA_MVREF_STATS_SYS_DEFAULTS | 物化视图刷新历史统计属性的系统范围默认值。 |
| DBA_MVREF_STATS_PARAMS | 展示与每个物化视图关联的刷新统计信息属性。 |
| DBA_MVREF_RUN_STATS | 展示物化视图的每次刷新运行的信息，每次运行均由 REFRESH_ID 标识。 |
| DBA_MVREF_STATS | 展示物化视图刷新的基本计时统计信息。 |
| DBA_MVREF_CHANGE_STATS | 展示物化视图刷新相关的统计信息。 |
| DBA_MVREF_STMT_STATS | 展示刷新语句关联的信息。 |
示例如下：
SELECT owner, mview_name, container_name, query, query_len FROM sys.DBA_MVIEWS;
返回结果如下：
+---------+--------------+-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------+
| OWNER | MVIEW_NAME | CONTAINER_NAME | QUERY | QUERY_LEN |
+---------+--------------+-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------+
| SYS | MV_TBL1_TBL2 | __mv_container_500214 | select "T1"."ID" AS "ID","T1"."NAME" AS "NAME","T2"."NOTES" AS "NOTES" from "SYS"."TBL1" "T1","SYS"."TBL2" "T2" where ("T1"."ID" = "T2"."TBL1_ID") | 146 |
| SYS | MV3_TBL1 | __mv_container_500211 | select "SYS"."TBL1"."ID" AS "ID","SYS"."TBL1"."NAME" AS "NAME" from "SYS"."TBL1" where ("SYS"."TBL1"."AGE" >= 20) | 113 |
| SYS | MV2_TBL1 | __mv_container_500208 | select "SYS"."TBL1"."ID" AS "ID","SYS"."TBL1"."NAME" AS "NAME" from "SYS"."TBL1" where ("SYS"."TBL1"."AGE" >= 20) | 113 |
| SYS | MV1_TBL1 | __mv_container_500205 | select "SYS"."TBL1"."ID" AS "ID","SYS"."TBL1"."NAME" AS "NAME" from "SYS"."TBL1" where ("SYS"."TBL1"."AGE" >= 20) | 113 |
| SYS | MV_TBL3 | __mv_container_500202 | select "SYS"."TBL3"."COL2" AS "COL2",count(*) AS "CNT",count("SYS"."TBL3"."COL3") AS "CNT_COL3",sum("SYS"."TBL3"."COL3") AS "SUM_COL3" from "SYS"."TBL3" group by "SYS"."TBL3"."COL2" | 181 |
| SYS | MV_TBL1 | __mv_container_500179 | select "SYS"."TBL1"."ID" AS "ID","SYS"."TBL1"."NAME" AS "NAME" from "SYS"."TBL1" where ("SYS"."TBL1"."AGE" >= 20) | 113 |
| USER001 | MV_TEST_TBL1 | __mv_container_500154 | select "USER001"."TEST_TBL1"."COL1" AS "COL1","USER001"."TEST_TBL1"."COL2" AS "COL2","USER001"."TEST_TBL1"."COL3" AS "COL3" from "USER001"."TEST_TBL1" where ("USER001"."TEST_TBL1"."COL3" >= 30) | 193 |
+---------+--------------+-----------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------+
7 rows in set
