统计信息查询类语句 - 云原生分布式数据库 PolarDB-X

PolarDB-X 1.0提供以下语句用于查询实时统计信息。

背景信息

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PolarDB-X 1.0 SHOW FULL STATS的结果是有区别的。

重要列说明：

QPS：应用到PolarDB-X 1.0的 QPS，通常称为逻辑 QPS；
RDS_QPS：PolarDB-X 1.0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PolarDB-X 1.0的响应时间，通常称为逻辑 RT（响应时间）；
RDS_RT(MS)：PolarDB-X 1.0到 RDS/MySQL 的响应时间，通常称为物理 RT；
NET_IN(KB/S)：PolarDB-X 1.0收到的网络流量；
NET_OUT(KB/S)：PolarDB-X 1.0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PolarDB-X 1.0 DB，此处显示的是PolarDB-X 1.0内部标记，与PolarDB-X 1.0 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PolarDB-X 1.0 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PolarDB-X 1.0 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PolarDB-X 1.0 DB。此处显示的是PolarDB-X 1.0内部标记，与PolarDB-X 1.0 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%  |                |
+------+---------------------------+--------------------+-------------------+----------------+------------+--------+----------------+