统计信息查询_SHOW_DAL_SQL 手册_云原生分布式数据库 PolarDB-X-阿里云

DRDS 提供以下语句用于查询实时统计信息。

SHOW [FULL] STATS
SHOW DB STATUS
SHOW FULL DB STATUS
SHOW TABLE STATUS

SHOW [FULL] STATS

查看整体的统计信息，这些信息都是瞬时值。注意不同版本的 DRDS SHOW FULL STATS的结果是有区别的。

重要列说明：

QPS：应用到 DRDS 的 QPS，通常称为逻辑 QPS；
RDS_QPS：DRDS 到 RDS 的 QPS，通常称为物理 QPS；
ERROR_PER_SECOND：每秒的错误数，包含 SQL 语法错误，主键冲突，系统错误，连通性错误等各类错误总和；
VIOLATION_PER_SECOND：每秒的主键或者唯一键冲突；
MERGE_QUERY_PER_SECCOND：通过分库分表，从多表中进行的查询；
ACTIVE_CONNECTIONS：正在使用的连接；
CONNECTION_CREATE_PER_SECCOND：每秒创建的连接数；
RT(MS)：应用到 DRDS 的响应时间，通常称为逻辑 RT（响应时间）；
RDS_RT(MS)：DRDS 到 RDS/MySQL 的响应时间，通常称为物理 RT；
NET_IN(KB/S)：DRDS 收到的网络流量；
NET_OUT(KB/S)：DRDS 输出的网络流量；
THREAD_RUNNING：正在运行的线程数；
HINT_USED_PER_SECOND：每秒带 HINT 的查询的数量；
HINT_USED_COUNT：启动到现在带 HINT 的查询总量；
AGGREGATE_QUERY_PER_SECCOND：每秒聚合查询的频次；
AGGREGATE_QUERY_COUNT：聚合查询总数（历史累计数据）；
TEMP_TABLE_CREATE_PER_SECCOND：每秒创建的临时表的数量；
TEMP_TABLE_CREATE_COUNT：启动到现在创建的临时表总数量；
MULTI_DB_JOIN_PER_SECCOND：每秒跨库 JOIN 的数量；
MULTI_DB_JOIN_COUNT：启动到现在跨库 JOIN 的总量。

示例：

mysql> show stats;
+------+---------+----------+-------------------+------------------+------------------------+--------------------+--------+------------+--------------+---------------+----------------+
| QPS  | RDS_QPS | SLOW_QPS | PHYSICAL_SLOW_QPS | ERROR_PER_SECOND | MERGE_QUERY_PER_SECOND | ACTIVE_CONNECTIONS | RT(MS) | RDS_RT(MS) | NET_IN(KB/S) | NET_OUT(KB/S) | THREAD_RUNNING |
+------+---------+----------+-------------------+------------------+------------------------+--------------------+--------+------------+--------------+---------------+----------------+
| 1.77 |    1.68 |     0.03 |              0.03 |             0.02 |                   0.00 |                  7 | 157.13 |      51.14 |       134.49 |          1.48 |              1 |
+------+---------+----------+-------------------+------------------+------------------------+--------------------+--------+------------+--------------+---------------+----------------+
1 row in set (0.01 sec)
mysql> show full stats;
+------+---------+----------+-------------------+------------------+----------------------+------------------------+--------------------+------------------------------+--------+------------+--------------+---------------+----------------+----------------------+-----------------+----------------------------+-----------------------+------------------------------+-------------------------+--------------------------+---------------------+-------+---------+-------------+------------+
| QPS  | RDS_QPS | SLOW_QPS | PHYSICAL_SLOW_QPS | ERROR_PER_SECOND | VIOLATION_PER_SECOND | MERGE_QUERY_PER_SECOND | ACTIVE_CONNECTIONS | CONNECTION_CREATE_PER_SECOND | RT(MS) | RDS_RT(MS) | NET_IN(KB/S) | NET_OUT(KB/S) | THREAD_RUNNING | HINT_USED_PER_SECOND | HINT_USED_COUNT | AGGREGATE_QUERY_PER_SECOND | AGGREGATE_QUERY_COUNT | TEMP_TABLE_CREATE_PER_SECOND | TEMP_TABLE_CREATE_COUNT | MULTI_DB_JOIN_PER_SECOND | MULTI_DB_JOIN_COUNT | CPU   | FREEMEM | FULLGCCOUNT | FULLGCTIME |
+------+---------+----------+-------------------+------------------+----------------------+------------------------+--------------------+------------------------------+--------+------------+--------------+---------------+----------------+----------------------+-----------------+----------------------------+-----------------------+------------------------------+-------------------------+--------------------------+---------------------+-------+---------+-------------+------------+
| 1.63 |    1.68 |     0.03 |              0.03 |             0.02 |                 0.00 |                   0.00 |                  6 |                         0.01 | 157.13 |      51.14 |       134.33 |          1.21 |              1 |                 0.00 |              54 |                       0.00 |                   663 |                         0.00 |                     512 |                     0.00 |                 516 | 0.09% |   6.96% |       76446 |   21326906 |
+------+---------+----------+-------------------+------------------+----------------------+------------------------+--------------------+------------------------------+--------+------------+--------------+---------------+----------------+----------------------+-----------------+----------------------------+-----------------------+------------------------------+-------------------------+--------------------------+---------------------+-------+---------+-------------+------------+
1 row in set (0.01 sec)

SHOW DB STATUS

用于查看物理库容量/性能信息，所有返回值为实时信息。容量信息通过 MySQL 系统表获得，与真实容量情况可能有差异。

重要列说明：

NAME： 代表一个 DRDS DB，此处显示的是 DRDS 内部标记，与 DRDS DB 名称不同；
CONNECTION_STRING： 分库的连接信息；
PHYSICAL_DB：分库名称，TOTAL 行代表一个 DRDS DB 中所有分库容量的总和；
SIZE_IN_MB： 分库中数据占用的空间，单位为 MB；
RATIO： 单个分库数据量在当前 DRDS DB 总数据量中的占比；
THREAD_RUNNING： 物理数据库实例当前正在执行的线程情况，含义与 MySQL SHOW GLOBAL STATUS 指令返回值的含义相同，详情请参考 MySQL 文档。

示例：

mysql> show db status;
+------+---------------------------+--------------------+-------------------+------------+--------+----------------+
| ID   | NAME                      | CONNECTION_STRING  | PHYSICAL_DB       | SIZE_IN_MB | RATIO  | THREAD_RUNNING |
+------+---------------------------+--------------------+-------------------+------------+--------+----------------+
|    1 | drds_db_1516187088365daui | 100.100.64.1:59077 | TOTAL             |  13.109375 | 100%   | 3              |
|    2 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0000 |   1.578125 | 12.04% |                |
|    3 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0001 |     1.4375 | 10.97% |                |
|    4 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0002 |     1.4375 | 10.97% |                |
|    5 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0003 |     1.4375 | 10.97% |                |
|    6 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0004 |   1.734375 | 13.23% |                |
|    7 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0005 |   1.734375 | 13.23% |                |
|    8 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0006 |   2.015625 | 15.38% |                |
|    9 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0007 |   1.734375 | 13.23% |                |
+------+---------------------------+--------------------+-------------------+------------+--------+----------------+

SHOW FULL DB STATUS [LIKE {tablename}]

用于查看物理库表容量和性能信息，所有返回值为实时信息。容量信息通过 MySQL 系统表获得，与真实容量情况可能有差异。

重要列说明：

NAME： 代表一个 DRDS DB。此处显示的是 DRDS 内部标记，与 DRDS DB 名称不同；
CONNECTION_STRING： 分库的连接信息；
PHYSICAL_DB：分库名称，TOTAL 行代表经过 LIKE 关键字筛选后得到的分库容量的总和。如果没有 LIKE，则为全部分库容量的总和；
PHYSICAL_TABLE：分表名称，TOTAL 行代表经过 LIKE 关键字筛选后得到的分表容量的总和。如果没有LIKE，则为全部分表容量的总和；
SIZE_IN_MB： 分表中数据占用的空间，单位为 MB；
RATIO: 单个分表数据量在当前筛选出的分表总数据量中的占比；
THREAD_RUNNING： 物理数据库实例当前正在执行的线程情况，含义与 MySQL SHOW GLOBAL STATUS 指令返回值的含义相同。详情请参考 MySQL 文档。

示例：

mysql> show full db status like hash_tb;
+------+---------------------------+--------------------+-------------------+----------------+------------+--------+----------------+
| ID   | NAME                      | CONNECTION_STRING  | PHYSICAL_DB       | PHYSICAL_TABLE | SIZE_IN_MB | RATIO  | THREAD_RUNNING |
+------+---------------------------+--------------------+-------------------+----------------+------------+--------+----------------+
|    1 | drds_db_1516187088365daui | 100.100.64.1:59077 | TOTAL             |                |     19.875 | 100%   | 3              |
|    2 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0000 | TOTAL          |    3.03125 | 15.25% |                |
|    3 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0000 | hash_tb_00     |   1.515625 | 7.63%  |                |
|    4 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0000 | hash_tb_01     |   1.515625 | 7.63%  |                |
|    5 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0001 | TOTAL          |        2.0 | 10.06% |                |
|    6 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0001 | hash_tb_02     |   1.515625 | 7.63%  |                |
|    7 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0001 | hash_tb_03     |   0.484375 | 2.44%  |                |
|    8 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0002 | TOTAL          |    3.03125 | 15.25% |                |
|    9 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0002 | hash_tb_04     |   1.515625 | 7.63%  |                |
|   10 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0002 | hash_tb_05     |   1.515625 | 7.63%  |                |
|   11 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0003 | TOTAL          |   1.953125 | 9.83%  |                |
|   12 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0003 | hash_tb_06     |   1.515625 | 7.63%  |                |
|   13 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0003 | hash_tb_07     |     0.4375 | 2.2%   |                |
|   14 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0004 | TOTAL          |    3.03125 | 15.25% |                |
|   15 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0004 | hash_tb_08     |   1.515625 | 7.63%  |                |
|   16 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0004 | hash_tb_09     |   1.515625 | 7.63%  |                |
|   17 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0005 | TOTAL          |   1.921875 | 9.67%  |                |
|   18 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0005 | hash_tb_11     |   1.515625 | 7.63%  |                |
|   19 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0005 | hash_tb_10     |    0.40625 | 2.04%  |                |
|   20 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0006 | TOTAL          |    3.03125 | 15.25% |                |
|   21 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0006 | hash_tb_12     |   1.515625 | 7.63%  |                |
|   22 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0006 | hash_tb_13     |   1.515625 | 7.63%  |                |
|   23 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0007 | TOTAL          |      1.875 | 9.43%  |                |
|   24 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0007 | hash_tb_14     |   1.515625 | 7.63%  |                |
|   25 | drds_db_1516187088365daui | 100.100.64.1:59077 | drds_db_xzip_0007 | hash_tb_15     |   0.359375 | 1.81%  |                |
+------+---------------------------+--------------------+-------------------+----------------+------------+--------+----------------+

SHOW TABLE STATUS [LIKE ‘pattern’ | WHERE expr]

获取表的信息，该指令聚合了底层各个物理分表的数据。

重要列详解：

NAME：表名称；
ENGINE：表的存储引擎；
VERSION：表的存储引擎的版本；
ROW_FORMAT：行格式，主要是 Dynamic、Fixed、Compressed 这三种格式。动态（Dynamic）行的行长度可变，例如 VARCHAR 或 BLOB 类型字段；固定（Fixed）行是指行长度不变，例如 CHAR 和 INTEGER 类型字段；
ROWS：表中的行数；
AVG_ROW_LENGTH：平均每行包括的字节数；
DATA_LENGTH：整个表的数据量（单位：字节）；
MAX_DATA_LENGTH：表可以容纳的最大数据量；
INDEX_LENGTH：索引占用磁盘的空间大小；
CREATE_TIME：表的创建时间；
UPDATE_TIME：表的最近更新时间；
COLLATION：表的默认字符集和字符排序规则；
CREATE_OPTIONS：指表创建时的其他所有选项。

mysql> show table status like 'multi_db_multi_tbl';
+--------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-----------------------+-------------+------------+-----------------+----------+----------------+---------+
| NAME               | ENGINE | VERSION | ROW_FORMAT | ROWS | AVG_ROW_LENGTH | DATA_LENGTH | MAX_DATA_LENGTH | INDEX_LENGTH | DATA_FREE | AUTO_INCREMENT | CREATE_TIME           | UPDATE_TIME | CHECK_TIME | COLLATION       | CHECKSUM | CREATE_OPTIONS | COMMENT |
+--------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-----------------------+-------------+------------+-----------------+----------+----------------+---------+
| multi_db_multi_tbl | InnoDB |      10 | Compact    |    2 |          16384 |       16384 |               0 |        16384 |         0 |         100000 | 2017-03-27 17:43:57.0 | NULL        | NULL       | utf8_general_ci | NULL     |                |         |
+--------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-----------------------+-------------+------------+-----------------+----------+----------------+---------+
1 row in set (0.03 sec)

和 DRDS 的 SCAN HINT 结合，还可以查看每个物理分表的数据量。具体请参考 HINT 语法。

mysql> /!TDDL:SCAN='multi_db_multi_tbl'*/show table status like 'multi_db_multi_tbl';
+----------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+--------------+
| Name                 | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time         | Update_time | Check_time | Collation       | Checksum | Create_options | Comment | Block_format |
+----------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+--------------+
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    1 |          16384 |       16384 |               0 |        16384 |         0 |              2 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_1 | InnoDB |      10 | Compact    |    0 |              0 |       16384 |               0 |        16384 |         0 |              1 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
| multi_db_multi_tbl_0 | InnoDB |      10 | Compact    |    1 |          16384 |       16384 |               0 |        16384 |         0 |              3 | 2017-03-27 17:43:57 | NULL        | NULL       | utf8_general_ci |     NULL |                |         | Original     |
+----------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+--------------+
16 rows in set (0.04 sec)