Question

我有一个很大的表（超过500.000.000行，有50多个字段，在64个分区中按字段idterminal逐个散列）。

表定义为：

CREATE TABLE `historico` (
  `Nombre` varchar(50) DEFAULT NULL,
[...]
  `Clave` varchar(64) DEFAULT NULL,
[...]
  `IdTerminal` int(11) NOT NULL DEFAULT '0',
[...]
  UNIQUE KEY `idx_Historico_Clave` (`IdTerminal`,`Clave`),
  KEY `idx_historico_FechaRecepcion` (`IdTerminal`,`FechaRecepcion`),
  KEY `idx_historico_idterminal_fechagps` (`IdTerminal`,`FechaGPS`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY HASH (`IdTerminal`)
PARTITIONS 64 */ |

我得到一些奇怪的结果：根据查询中输入的字段，我得到的行数是不同的：

mysql> select idterminal, clave from historico partition(p0) where  clave = 'G20191016081555P41344';
+------------+-----------------------+
| idterminal | clave                 |
+------------+-----------------------+
|      41344 | G20191016081555P41344 |
+------------+-----------------------+
1 row in set (0.00 sec)

mysql> select nombre, idterminal, clave from historico partition(p0) where  clave = 'G20191016081555P41344';
+----------+------------+-----------------------+
| nombre   | idterminal | clave                 |
+----------+------------+-----------------------+
| A Name   |      41344 | G20191016081555P41344 |
| A Name   |      41344 | G20191016081555P41344 |
| A Name   |      41344 | G20191016081555P41344 |
| A Name   |      41344 | G20191016081555P41344 |
+----------+------------+-----------------------+
4 rows in set (5.07 sec)

此表在“ idTerminal”和“ clave”字段上具有唯一索引，因此我了解第二个查询必须仅返回一行。当我尝试重建该分区时更改表historico重建分区p0；我得到：

第1行的错误1022（23000）：无法写入；表'historico'中的重复键

其他疯狂的结果：

mysql> select count(*) as how_many, clave, idterminal from historico partition(p0) group by clave, idterminal order by how_many desc limit 10;
+----------+----------------------------+------------+
| how_many | clave                      | idterminal |
+----------+----------------------------+------------+
|        4 | G20191021142024P700653     |      15680 |
|        4 | G20191001182332P700653     |      15680 |
|        4 | G20191001183144P700653     |      15680 |
|        4 | G20191005063231P830677     |      53824 |
|        4 | G20191005080409P830677     |      53824 |
|        4 | G20191005103808P830677     |      53824 |
|        4 | G20191005123548A830677-124 |      53824 |
|        4 | G20191005144959P830677     |      53824 |
|        4 | G20191005161853P830677     |      53824 |
|        4 | G20191005172114P830677     |      53824 |
+----------+----------------------------+------------+
10 rows in set (1 min 25.36 sec)

mysql> select count(*) as how_many, clave, idterminal from historico partition(p0) where idterminal = 15680 and clave = 'G20191021142024P700653' group by clave, idterminal order by how_many desc limit 10;
+----------+------------------------+------------+
| how_many | clave                  | idterminal |
+----------+------------------------+------------+
|        1 | G20191021142024P700653 |      15680 |
+----------+------------------------+------------+
1 row in set (0.00 sec)

我的第一个怀疑是唯一索引已损坏，但是如果我检查分区：

alter table historico check partition p0;

我得到：

datos.historico check   status  OK

因此，它看起来像MySQL（版本8.0.17）中的错误，有人曾经疯狂过吗？关于我该怎么办的一些想法？

选择不同的字段时，MySQL返回不同的行数

0 个答案: