查詢所有數(shù)據(jù)庫的總大小
方法如下：
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mysql> use information_schema;mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES;+-----------+| data |+-----------+| 3052.76MB |+-----------+1 row in set (0.02 sec) |
統(tǒng)計一下所有庫數(shù)據(jù)量
每張表數(shù)據(jù)量=AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH
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SELECTSUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mbFROM information_schema.TABLES |
統(tǒng)計每個庫大小：
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SELECTtable_schema,SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mbFROM information_schema.TABLES group by table_schema; |
第二種情況：查看指定數(shù)據(jù)庫的大小，比如說：數(shù)據(jù)庫test，方法如下：
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mysql> use information_schema;mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='test';+----------+| data |+----------+| 142.84MB |+----------+1 row in set (0.00 sec) |
1.查看所有數(shù)據(jù)庫各容量大小
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selecttable_schema as '數(shù)據(jù)庫',sum(table_rows) as '記錄數(shù)',sum(truncate(data_length/1024/1024, 2)) as '數(shù)據(jù)容量(MB)',sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'from information_schema.tablesgroup by table_schemaorder by sum(data_length) desc, sum(index_length) desc; |
2.查看所有數(shù)據(jù)庫各表容量大小
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selecttable_schema as '數(shù)據(jù)庫',table_name as '表名',table_rows as '記錄數(shù)',truncate(data_length/1024/1024, 2) as '數(shù)據(jù)容量(MB)',truncate(index_length/1024/1024, 2) as '索引容量(MB)'from information_schema.tablesorder by data_length desc, index_length desc; |
3.查看指定數(shù)據(jù)庫容量大小
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例：查看mysql庫容量大小selecttable_schema as '數(shù)據(jù)庫',sum(table_rows) as '記錄數(shù)',sum(truncate(data_length/1024/1024, 2)) as '數(shù)據(jù)容量(MB)',sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'from information_schema.tableswhere table_schema='mysql'; |
4.查看指定數(shù)據(jù)庫各表容量大小
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例：查看mysql庫各表容量大小selecttable_schema as '數(shù)據(jù)庫',table_name as '表名',table_rows as '記錄數(shù)',truncate(data_length/1024/1024, 2) as '數(shù)據(jù)容量(MB)',truncate(index_length/1024/1024, 2) as '索引容量(MB)'from information_schema.tableswhere table_schema='mysql'order by data_length desc, index_length desc; |
題外方法
直接用shell命令統(tǒng)計mysql data目錄中的大小（注意只有庫，不包含數(shù)據(jù)庫日志大小）
備注 ：
data_length ：存儲數(shù)據(jù)大小
data_length/1024/1024：將字節(jié)轉(zhuǎn)換為MB
round(sum(data_length/1024/1024),2)：取兩位小數(shù)
concat(round(sum(data_length/1024/1024),2),'MB') ：給計算結(jié)果追加單位 “MB”
到此這篇關(guān)于Mysql 查詢數(shù)據(jù)庫容量大小的方法步驟的文章就介紹到這了,更多相關(guān)Mysql 查詢數(shù)據(jù)庫容量大小內(nèi)容請搜索服務(wù)器之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持服務(wù)器之家！
原文鏈接：https://segmentfault.com/a/1190000022874702
