Dba 常用脚本 | 十字螺丝钉的DBA日记

MySQL 导出表上所有索引的创建语句

获取单表上所有索引的建表语句

SELECT 
    CONCAT('ALTER TABLE `',
            TABLE_NAME,
            '` ',
            'ADD ',
            IF(NON_UNIQUE = 1,
                CASE UPPER(INDEX_TYPE)
                    WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'
                    WHEN 'SPATIAL' THEN 'SPATIAL INDEX'
                    ELSE CONCAT('INDEX `',
                            INDEX_NAME,
                            '` USING ',
                            INDEX_TYPE)
                END,
                IF(UPPER(INDEX_NAME) = 'PRIMARY',
                    CONCAT('PRIMARY KEY USING ', INDEX_TYPE),
                    CONCAT('UNIQUE INDEX `',
                            INDEX_NAME,
                            '` USING ',
                            INDEX_TYPE))),
            '(',
            GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`')
                ORDER BY SEQ_IN_INDEX ASC
                SEPARATOR ', '),
            ');') AS 'Show_Add_Indexes'
FROM
    information_schema.STATISTICS
WHERE
    TABLE_SCHEMA = '库名'
        AND TABLE_NAME = '表明'
GROUP BY TABLE_NAME , INDEX_NAME
ORDER BY TABLE_NAME ASC , INDEX_NAME ASC;

SELECT

CONCAT('ALTER TABLE `',

TABLE_NAME,

'` ',

'ADD ',

IF(NON_UNIQUE = 1,

CASE UPPER(INDEX_TYPE)

WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'

WHEN 'SPATIAL' THEN 'SPATIAL INDEX'

ELSE CONCAT('INDEX `',

INDEX_NAME,

'` USING ',

INDEX_TYPE)

END,

IF(UPPER(INDEX_NAME) = 'PRIMARY',

CONCAT('PRIMARY KEY USING ', INDEX_TYPE),

CONCAT('UNIQUE INDEX `',

INDEX_NAME,

'` USING ',

INDEX_TYPE))),

'(',

GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`')

ORDER BY SEQ_IN_INDEX ASC

SEPARATOR ', '),

');') AS 'Show_Add_Indexes'

FROM

information_schema.STATISTICS

WHERE

TABLE_SCHEMA = '库名'

AND TABLE_NAME = '表明'

GROUP BY TABLE_NAME , INDEX_NAME

ORDER BY TABLE_NAME ASC , INDEX_NAME ASC;

获取非主键索引的建表语句

SELECT 
    CONCAT('ALTER TABLE `',
            TABLE_NAME,
            '` ',
            'ADD ',
            IF(NON_UNIQUE = 1,
                CASE UPPER(INDEX_TYPE)
                    WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'
                    WHEN 'SPATIAL' THEN 'SPATIAL INDEX'
                    ELSE CONCAT('INDEX `',
                            INDEX_NAME,
                            '` USING ',
                            INDEX_TYPE)
                END,
                IF(UPPER(INDEX_NAME) = 'PRIMARY',
                    CONCAT('PRIMARY KEY USING ', INDEX_TYPE),
                    CONCAT('UNIQUE INDEX `',
                            INDEX_NAME,
                            '` USING ',
                            INDEX_TYPE))),
            '(',
            GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`')
                ORDER BY SEQ_IN_INDEX ASC
                SEPARATOR ', '),
            ');') AS 'Show_Add_Indexes'
FROM
    information_schema.STATISTICS
WHERE
    UPPER(INDEX_NAME) <> 'PRIMARY'
        AND TABLE_SCHEMA = '库名'
        AND TABLE_NAME = '表名'
GROUP BY TABLE_NAME , INDEX_NAME
ORDER BY TABLE_NAME ASC , INDEX_NAME ASC;

SELECT

CONCAT('ALTER TABLE `',

TABLE_NAME,

'` ',

'ADD ',

IF(NON_UNIQUE = 1,

CASE UPPER(INDEX_TYPE)

WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'

WHEN 'SPATIAL' THEN 'SPATIAL INDEX'

ELSE CONCAT('INDEX `',

INDEX_NAME,

'` USING ',

INDEX_TYPE)

END,

IF(UPPER(INDEX_NAME) = 'PRIMARY',

CONCAT('PRIMARY KEY USING ', INDEX_TYPE),

CONCAT('UNIQUE INDEX `',

INDEX_NAME,

'` USING ',

INDEX_TYPE))),

'(',

GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`')

ORDER BY SEQ_IN_INDEX ASC

SEPARATOR ', '),

');') AS 'Show_Add_Indexes'

FROM

information_schema.STATISTICS

WHERE

UPPER(INDEX_NAME) <> 'PRIMARY'

AND TABLE_SCHEMA = '库名'

AND TABLE_NAME = '表名'

GROUP BY TABLE_NAME , INDEX_NAME

ORDER BY TABLE_NAME ASC , INDEX_NAME ASC;

获取主键索引的建表语句

SELECT 
    CONCAT('ALTER TABLE `',
            TABLE_NAME,
            '` ',
            'ADD ',
            IF(NON_UNIQUE = 1,
                CASE UPPER(INDEX_TYPE)
                    WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'
                    WHEN 'SPATIAL' THEN 'SPATIAL INDEX'
                    ELSE CONCAT('INDEX `',
                            INDEX_NAME,
                            '` USING ',
                            INDEX_TYPE)
                END,
                IF(UPPER(INDEX_NAME) = 'PRIMARY',
                    CONCAT('PRIMARY KEY USING ', INDEX_TYPE),
                    CONCAT('UNIQUE INDEX `',
                            INDEX_NAME,
                            '` USING ',
                            INDEX_TYPE))),
            '(',
            GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`')
                ORDER BY SEQ_IN_INDEX ASC
                SEPARATOR ', '),
            ');') AS 'Show_Add_Indexes'
FROM
    information_schema.STATISTICS
WHERE
    UPPER(INDEX_NAME) = 'PRIMARY'
        AND TABLE_SCHEMA = '库名'
        AND TABLE_NAME = '表名'
GROUP BY TABLE_NAME , INDEX_NAME
ORDER BY TABLE_NAME ASC , INDEX_NAME ASC;

SELECT

CONCAT('ALTER TABLE `',

TABLE_NAME,

'` ',

'ADD ',

IF(NON_UNIQUE = 1,

CASE UPPER(INDEX_TYPE)

WHEN 'FULLTEXT' THEN 'FULLTEXT INDEX'

WHEN 'SPATIAL' THEN 'SPATIAL INDEX'

ELSE CONCAT('INDEX `',

INDEX_NAME,

'` USING ',

INDEX_TYPE)

END,

IF(UPPER(INDEX_NAME) = 'PRIMARY',

CONCAT('PRIMARY KEY USING ', INDEX_TYPE),

CONCAT('UNIQUE INDEX `',

INDEX_NAME,

'` USING ',

INDEX_TYPE))),

'(',

GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`')

ORDER BY SEQ_IN_INDEX ASC

SEPARATOR ', '),

');') AS 'Show_Add_Indexes'

FROM

information_schema.STATISTICS

WHERE

UPPER(INDEX_NAME) = 'PRIMARY'

AND TABLE_SCHEMA = '库名'

AND TABLE_NAME = '表名'

GROUP BY TABLE_NAME , INDEX_NAME

ORDER BY TABLE_NAME ASC , INDEX_NAME ASC;

如果想获取整个库中所有表的索引创建语句，可以写存储过程循环执行就行了。 &nbs

MySQL：如何找出长时间执行的查询SQL和事务SQL

MySQL中存在长时间运行的SQL和事务（超过120S），对数据库而言是潜在隐患，这颗“雷”总有爆炸的一天。比如，修改表结构之前，切记要在从库检查是否有长时间运行的SQL，有请杀掉，避免从库产生元数据锁引起的从库延迟。建议定时扫描MySQL中长时间运行的SQL，并kill掉，排除隐患。

SELECT
	trx.trx_id,
	trx.trx_started,
	trx.trx_mysql_thread_id,
	trx.trx_query
FROM
	INFORMATION_SCHEMA.INNODB_TRX AS trx
INNER JOIN INFORMATION_SCHEMA. PROCESSLIST AS pl 
	ON trx.trx_mysql_thread_id = pl.id
WHERE
	trx.trx_started < CURRENT_TIMESTAMP - INTERVAL 120 SECOND
AND pl. USER <> 'system_user';

SELECT

trx.trx_id,

trx.trx_started,

trx.trx_mysql_thread_id,

trx.trx_query

FROM

INFORMATION_SCHEMA.INNODB_TRX AS trx

INNER JOIN INFORMATION_SCHEMA. PROCESSLIST AS pl

ON trx.trx_mysql_thread_id = pl.id

WHERE

trx.trx_started < CURRENT_TIMESTAMP - INTERVAL 120 SECOND

AND pl. USER <> 'system_user';

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