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专栏/.../

sync-diff-inspector比对表结构,索引

 Brian  发表于  2024-08-13
原创

目的

以下对列默认值,列是否可为空,表的主键,表的唯一约束 不同的情况进行上右下表结构的比对

环境

上游环境:Mysql v5.7.37

下游环境:TiDB v6.5.6

tool版本:sync-diff-inspector v6.5.7

Sync-diff-inspector 配置文件:

[tidb@vmxx.xx.xx-25 ~]$ cat sync-diff.yaml 
check-thread-count = 2
export-fix-sql = true
check-struct-only = false

[data-sources]
[data-sources.upstream]
    host = "xx.xx.xx.25" # 替换为实际上游集群 ip
    port = 3307
    user = "root"
    password = "123"
    #snapshot = "448552618951966723" # 配置为实际的备份时间点
[data-sources.downstream]
    host = "xx.xx.xx.25" # 替换为实际下游集群 ip
    port = 4000
    user = "root"
    password = "123"
    #snapshot = "448553665253343269" # 配置为实际的恢复时间点

[task]
    output-dir = "./output"
    source-instances = ["upstream"]
    target-instance = "downstream"
    target-check-tables = ["t.t"]

对比默认值

上游表结构:

root@localhost : t 06:55:43>>> show create table t;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                        |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT '404',
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

对比结果:

上下游列默认值不同,可以校验通过。

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... equivalent
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
A total of 1 table have been compared and all are equal.
You can view the comparision details through './output/sync_diff.log'

对比列是否可为空

上游表结构:

root@localhost : t 06:55:43>>> show create table t;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                   |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) NOT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

对比结果:

上下游列是否可为空不同,可以校验通过。

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... equivalent
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
A total of 1 table have been compared and all are equal.
You can view the comparision details through './output/sync_diff.log'

对比表的主键

上游表结构:

root@localhost : t 07:15:15>>> show create table t;
+-------+-----------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                          |
+-------+-----------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                       |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

对比结果:

上下游中是否有主键不会校验,可以校验通过。

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... equivalent
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
A total of 1 table have been compared and all are equal.
You can view the comparision details through './output/sync_diff.log'

对比唯一索引和普通索引

上游表结构:

root@localhost : t 07:31:26>>> show create table t;
+-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                       |
+-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                     |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
  UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

对比结果:

对比唯一索引和普通索引,可以校验通过。

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... equivalent
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
A total of 1 table have been compared and all are equal.
You can view the comparision details through './output/sync_diff.log'

对比索引数量不同

上游表结构:

root@localhost : t 07:37:12>>> show create table t;
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                        |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`),
  KEY `addr` (`addr`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                                                        |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
  UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

对比结果:

可以校验出来上下游表中的索引数量不同

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... failure
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
The structure of `t`.`t` is not equal

The rest of tables are all equal.

A total of 1 tables have been compared, 0 tables finished, 1 tables failed, 0 tables skipped.
The patch file has been generated in 
        'output/fix-on-downstream/'
You can view the comparision details through './output/sync_diff.log'

对比单列索引覆盖列不同

上游表结构:

root@localhost : t 07:46:43>>> show create table t;
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                          |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `addr` (`addr`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                                                 |
+-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
  KEY `name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

对比结果:

可以校验出来单列索引覆盖列不同

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... failure
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
The structure of `t`.`t` is not equal

The rest of tables are all equal.

A total of 1 tables have been compared, 0 tables finished, 1 tables failed, 0 tables skipped.
The patch file has been generated in 
        'output/fix-on-downstream/'
You can view the comparision details through './output/sync_diff.log'

对比联合索引和单列索引

上游表结构:

root@localhost : t 07:46:46>>> show create table t;
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                          |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `addr` (`addr`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

下游表结构:

mysql> show create table t;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                                                        |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t     | CREATE TABLE `t` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `addr` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
  KEY `name` (`name`,`addr`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

对比结果:

可以校验出联合索引和单列索引的差异

[tidb@vmxx.xx.xx-25 ~]$ tidb-community-toolkit-v6.5.7-linux-amd64/sync_diff_inspector --config=sync-diff.yaml 
A total of 1 tables need to be compared

Comparing the table structure of ``t`.`t`` ... failure
Comparing the table data of ``t`.`t`` ... equivalent
_____________________________________________________________________________
Progress [============================================================>] 100% 0/0
The structure of `t`.`t` is not equal

The rest of tables are all equal.

A total of 1 tables have been compared, 0 tables finished, 1 tables failed, 0 tables skipped.
The patch file has been generated in 
        'output/fix-on-downstream/'
You can view the comparision details through './output/sync_diff.log'

结论

对于sync-diff-inspector校验表结构,有以下结论:

忽略校验:

列的默认值差异

列是否可以为空的差异

表是否有主键的差异

表中唯一索引和普通索引的差异

可校验:

索引(唯一索引+普通索引)数量的差异

单列索引覆盖列的差异

联合索引和单列索引的差异(即使联合索引和单列索引有相同的部分覆盖列)

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