MySQL--查询表统计信息

## 查看非InnoDB引擎表
SELECT 
TABLE_SCHEMA AS database_name,
TABLE_NAME AS table_name,
TABLE_ROWS AS table_rows,
ENGINE AS table_engine,
ROUND((DATA_LENGTH)/1024.0/1024, 2) AS Data_MB,
ROUND((INDEX_LENGTH)/1024.0/1024, 2) AS Index_MB,
ROUND((DATA_LENGTH+INDEX_LENGTH)/1024.0/1024, 2) AS Total_MB,
ROUND((DATA_FREE)/1024.0/1024, 2) AS Free_MB
FROM information_schema.`TABLES` AS T1
WHERE T1.`TABLE_SCHEMA` NOT IN(‘performance_schema‘,‘mysql‘,‘information_schema‘,‘sys‘)
AND T1.`ENGINE` NOT IN (‘innodb‘);

## 查看数据表较大的表
SELECT 
TABLE_SCHEMA AS database_name,
TABLE_NAME AS table_name,
TABLE_ROWS AS table_rows,
ENGINE AS table_engine,
ROUND((DATA_LENGTH)/1024.0/1024, 2) AS Data_MB,
ROUND((INDEX_LENGTH)/1024.0/1024, 2) AS Index_MB,
ROUND((DATA_LENGTH+INDEX_LENGTH)/1024.0/1024, 2) AS Total_MB,
ROUND((DATA_FREE)/1024.0/1024, 2) AS Free_MB
FROM information_schema.`TABLES` AS T1
WHERE T1.`TABLE_SCHEMA` NOT IN(‘performance_schema‘,‘mysql‘,‘information_schema‘)
ORDER BY T1.`TABLE_ROWS` DESC
LIMIT 10;

## 查看碎片较多的表
SELECT 
TABLE_SCHEMA AS database_name,
TABLE_NAME AS table_name,
TABLE_ROWS AS table_rows,
ENGINE AS table_engine,
ROUND((DATA_LENGTH)/1024.0/1024, 2) AS Data_MB,
ROUND((INDEX_LENGTH)/1024.0/1024, 2) AS Index_MB,
ROUND((DATA_LENGTH+INDEX_LENGTH)/1024.0/1024, 2) AS Total_MB,
ROUND((DATA_FREE)/1024.0/1024, 2) AS Free_MB,
ROUND(ROUND((DATA_FREE)/1024.0/1024, 2) /ROUND((DATA_LENGTH+INDEX_LENGTH)/1024.0/1024, 2)*100,2)AS Free_Percent
FROM information_schema.`TABLES` AS T1
WHERE T1.`TABLE_SCHEMA` NOT IN(‘performance_schema‘,‘mysql‘,‘information_schema‘)
AND ROUND(ROUND((DATA_FREE)/1024.0/1024, 2) /ROUND((DATA_LENGTH+INDEX_LENGTH)/1024.0/1024, 2)*100,2) >10
AND ROUND((DATA_FREE)/1024.0/1024, 2)>100
ORDER BY ROUND(ROUND((DATA_FREE)/1024.0/1024, 2) /ROUND((DATA_LENGTH+INDEX_LENGTH)/1024.0/1024, 2)*100,2) DESC
LIMIT 10;

## 查看表自增值
SELECT 
T2.TABLE_SCHEMA,
T2.TABLE_NAME, 
T1.COLUMN_NAME,
T1.COLUMN_TYPE,
T2.AUTO_INCREMENT
FROM information_schema.columns AS T1
INNER JOIN information_schema.tables AS T2
ON T1.TABLE_SCHEMA=T2.TABLE_SCHEMA
AND T1.TABLE_NAME=T2.TABLE_NAME
WHERE T1.EXTRA=‘auto_increment‘
AND T1.DATA_TYPE NOT LIKE ‘%bigint%‘
ORDER BY T2.AUTO_INCREMENT DESC
LIMIT 100;