SHOW QUERY STATS
Name
SHOW QUERY STATS
描述
该语句用于展示数据库中历史查询命中的库表列的情况
SHOW QUERY STATS [[FOR db_name]|[FROM table_name]] [ALL] [VERBOSE]];
说明：
- 支持查询数据库和表的历史查询命中情况，重启 fe 后数据会重置，每个 fe 单独统计
- 通过 FOR DATABASE 和 FROM TABLE 可以指定查询数据库或者表的命中情况，后面分别接数据库名或者表名
- ALL 可以指定是否展示所有 index 的查询命中情况，VERBOSE 可以展示更详细的命中情况，这两个参数可以单独使用， 也可以一起使用，但是必须放在最后 而且只能用在表的查询上
- 如果没有 use 任何数据库那么直接执行
SHOW QUERY STATS将展示所有数据库的命中情况 - 命中结果中可能有两列： QueryCount：该列被查询次数 FilterCount: 该列作为 where 条件被查询的次数
示例
-
展示表
baseall的查询命中情况MySQL [test_query_db]> show query stats from baseall;
+-------+------------+-------------+
| Field | QueryCount | FilterCount |
+-------+------------+-------------+
| k0 | 0 | 0 |
| k1 | 0 | 0 |
| k2 | 0 | 0 |
| k3 | 0 | 0 |
| k4 | 0 | 0 |
| k5 | 0 | 0 |
| k6 | 0 | 0 |
| k10 | 0 | 0 |
| k11 | 0 | 0 |
| k7 | 0 | 0 |
| k8 | 0 | 0 |
| k9 | 0 | 0 |
| k12 | 0 | 0 |
| k13 | 0 | 0 |
+-------+------------+-------------+
14 rows in set (0.002 sec)
MySQL [test_query_db]> select k0, k1,k2, sum(k3) from baseall where k9 > 1 group by k0,k1,k2;
+------+------+--------+-------------+
| k0 | k1 | k2 | sum(`k3`) |
+------+------+--------+-------------+
| 0 | 6 | 32767 | 3021 |
| 1 | 12 | 32767 | -2147483647 |
| 0 | 3 | 1989 | 1002 |
| 0 | 7 | -32767 | 1002 |
| 1 | 8 | 255 | 2147483647 |
| 1 | 9 | 1991 | -2147483647 |
| 1 | 11 | 1989 | 25699 |
| 1 | 13 | -32767 | 2147483647 |
| 1 | 14 | 255 | 103 |
| 0 | 1 | 1989 | 1001 |
| 0 | 2 | 1986 | 1001 |
| 1 | 15 | 1992 | 3021 |
+------+------+--------+-------------+
12 rows in set (0.050 sec)
MySQL [test_query_db]> show query stats from baseall;
+-------+------------+-------------+
| Field | QueryCount | FilterCount |
+-------+------------+-------------+
| k0 | 1 | 0 |
| k1 | 1 | 0 |
| k2 | 1 | 0 |
| k3 | 1 | 0 |
| k4 | 0 | 0 |
| k5 | 0 | 0 |
| k6 | 0 | 0 |
| k10 | 0 | 0 |
| k11 | 0 | 0 |
| k7 | 0 | 0 |
| k8 | 0 | 0 |
| k9 | 1 | 1 |
| k12 | 0 | 0 |
| k13 | 0 | 0 |
+-------+------------+-------------+
14 rows in set (0.001 sec) -
展示表的所物化视图的的命中的汇总情况
MySQL [test_query_db]> show query stats from baseall all;
+-----------+------------+
| IndexName | QueryCount |
+-----------+------------+
| baseall | 1 |
+-----------+------------+
1 row in set (0.005 sec) -
展示表的所物化视图的的命中的详细情况
MySQL [test_query_db]> show query stats from baseall all verbose;
+-----------+-------+------------+-------------+
| IndexName | Field | QueryCount | FilterCount |
+-----------+-------+------------+-------------+
| baseall | k0 | 1 | 0 |
| | k1 | 1 | 0 |
| | k2 | 1 | 0 |
| | k3 | 1 | 0 |
| | k4 | 0 | 0 |
| | k5 | 0 | 0 |
| | k6 | 0 | 0 |
| | k10 | 0 | 0 |
| | k11 | 0 | 0 |
| | k7 | 0 | 0 |
| | k8 | 0 | 0 |
| | k9 | 1 | 1 |
| | k12 | 0 | 0 |
| | k13 | 0 | 0 |
+-----------+-------+------------+-------------+
14 rows in set (0.017 sec) -
展示数据库的命中情况
MySQL [test_query_db]> show query stats for test_query_db;
+----------------------------+------------+
| TableName | QueryCount |
+----------------------------+------------+
| compaction_tbl | 0 |
| bigtable | 0 |
| empty | 0 |
| tempbaseall | 0 |
| test | 0 |
| test_data_type | 0 |
| test_string_function_field | 0 |
| baseall | 1 |
| nullable | 0 |
+----------------------------+------------+
9 rows in set (0.005 sec) -
展示所有数据库的命中情况，这时不能 use 任何数据库
MySQL [(none)]> show query stats;
+-----------------+------------+
| Database | QueryCount |
+-----------------+------------+
| test_query_db | 1 |
+-----------------+------------+
1 rows in set (0.005 sec)SHOW QUERY STATS;
关键词
SHOW， QUERY, STATS;
