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SHOW [FULL] STATS
SHOW DB STATUS
SHOW FULL DB STATUS [LIKE {tablename}]
SHOW TABLE STATUS [LIKE 'pattern' | WHERE expr]

SHOW [FULL] STATS

查看整體的統計信息，這些信息都是瞬時值。注意不同版本的PolarDB-X 1.0SHOW FULL STATS的結果是有區別的。

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)

重要列說明：

QPS：應用到PolarDB-X 1.0的QPS，通常稱為邏輯QPS；
RDS_QPS：PolarDB-X 1.0到RDS的QPS，通常稱為物理QPS；
ERROR_PER_SECOND：每秒的錯誤數，包含SQL語法錯誤，主鍵沖突，系統錯誤，連通性錯誤等各類錯誤總和；
VIOLATION_PER_SECOND：每秒的主鍵或者唯一鍵沖突；
MERGE_QUERY_PER_SECCOND：通過分庫分表，從多表中進行的查詢；
ACTIVE_CONNECTIONS：正在使用的連接；
CONNECTION_CREATE_PER_SECCOND：每秒創建的連接數；
RT(MS)：應用到PolarDB-X 1.0的響應時間，通常稱為邏輯RT（響應時間）；
RDS_RT(MS)：PolarDB-X 1.0到RDS/MySQL的響應時間，通常稱為物理RT；
NET_IN(KB/S)：PolarDB-X 1.0收到的網絡流量；

NET_OUT(KB/S)：PolarDB-X 1.0輸出的網絡流量；
THREAD_RUNNING：正在運行的線程數；
HINT_USED_PER_SECOND：每秒帶HINT的查詢的數量；
HINT_USED_COUNT：啟動到現在帶HINT的查詢總量；
AGGREGATE_QUERY_PER_SECCOND：每秒聚合查詢的頻次；
AGGREGATE_QUERY_COUNT：聚合查詢總數（歷史累計數據）；
TEMP_TABLE_CREATE_PER_SECCOND：每秒創建的臨時表的數量；
TEMP_TABLE_CREATE_COUNT：啟動到現在創建的臨時表總數量；
MULTI_DB_JOIN_PER_SECCOND：每秒跨庫JOIN的數量；
MULTI_DB_JOIN_COUNT：啟動到現在跨庫JOIN的總量。

SHOW DB STATUS

用于查看物理庫容量/性能信息，所有返回值為實時信息。容量信息通過MySQL系統表獲得，與真實容量情況可能有差異。

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% |                |
+------+---------------------------+--------------------+-------------------+------------+--------+----------------+

重要列說明：

NAME：代表一個PolarDB-X 1.0DB，此處顯示的是PolarDB-X 1.0內部標記，與PolarDB-X 1.0DB名稱不同；
CONNECTION_STRING：分庫的連接信息；
PHYSICAL_DB：分庫名稱，TOTAL行代表一個PolarDB-X 1.0DB中所有分庫容量的總和；
SIZE_IN_MB：分庫中數據占用的空間，單位為MB；
RATIO：單個分庫數據量在當前PolarDB-X 1.0DB總數據量中的占比；
THREAD_RUNNING：物理數據庫實例當前正在執行的線程情況，含義與MySQL語句SHOW GLOBAL STATUS返回值的含義相同，詳情請參考 MySQL 文檔。

SHOW FULL DB STATUS [LIKE {tablename}]

用于查看物理庫表容量和性能信息，所有返回值為實時信息。容量信息通過MySQL系統表獲得，與真實容量情況可能有差異。

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%  |                |
+------+---------------------------+--------------------+-------------------+----------------+------------+--------+----------------+

重要列說明：

NAME：代表一個PolarDB-X 1.0DB。此處顯示的是PolarDB-X 1.0內部標記，與PolarDB-X 1.0DB名稱不同；
CONNECTION_STRING：分庫的連接信息；
PHYSICAL_DB：分庫名稱，TOTAL行代表經過LIKE關鍵字篩選后得到的分庫容量的總和。如果沒有LIKE，則為全部分庫容量的總和；
PHYSICAL_TABLE：分表名稱，TOTAL行代表經過LIKE關鍵字篩選后得到的分表容量的總和。如果沒有LIKE，則為全部分表容量的總和；
SIZE_IN_MB：分表中數據占用的空間，單位為 MB；
RATIO：單個分表數據量在當前篩選出的分表總數據量中的占比；
THREAD_RUNNING：物理數據庫實例當前正在執行的線程情況，含義與MySQLSHOW GLOBAL STATUS指令返回值的含義相同。詳情請參考 MySQL 文檔。

SHOW TABLE STATUS [LIKE 'pattern' | WHERE expr]

獲取表的信息，該指令聚合了底層各個物理分表的數據。

示例：

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)

重要列詳解：

NAME：表名稱；
ENGINE：表的存儲引擎；
VERSION：表的存儲引擎的版本；
ROW_FORMAT：行格式，主要是Dynamic、Fixed、Compressed這三種格式。動態（Dynamic）行的行長度可變，例如VARCHAR或BLOB類型字段；固定（Fixed）行是指行長度不變，例如CHAR和INTEGER類型字段；
ROWS：表中的行數；
AVG_ROW_LENGTH：平均每行包括的字節數；
DATA_LENGTH：整個表的數據量（單位：字節）；
MAX_DATA_LENGTH：表可以容納的最大數據量；
INDEX_LENGTH：索引占用磁盤的空間大小；

CREATE_TIME：表的創建時間；
UPDATE_TIME：表的最近更新時間；
COLLATION：表的默認字符集和字符排序規則；
CREATE_OPTIONS：指表創建時的其他所有選項。

和PolarDB-X 1.0的SCAN HINT結合，還可以查看每個物理分表的數據量。具體請參考Hint。

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)

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統計信息查詢

SHOW [FULL] STATS

SHOW DB STATUS

SHOW FULL DB STATUS [LIKE {tablename}]

SHOW TABLE STATUS [LIKE 'pattern' | WHERE expr]