说明: 通过MySQL的 information_schema 数据库,可查询数据库中每个表占用的空间、表记录的行数;该库中有一个 TABLES 表,这个表主要字段分别是: TABLE_SCHEMA : 数据库名 TABLE_NAME:表名 ENGINE:所使用的存储引擎 TABLES_ROWS:记录数 DATA_LENGTH:数据大小 INDEX_LENGTH:索引大小 其他字段请参考MySQL的手册,查看...
Query OK, 0 rows affected (10.03 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> select table_schema,table_name,data_length/1024/1024, index_length/1024/1024,(data_length+index_length)/1024/1024,data_free/1024/1024 from information_schema.tables where TABLE_SCHEMA='poc01' and TABLE_NAME...
假设我们有一个名为my_database的数据库,我们可以使用以下查询语句来查看该数据库的表空间剩余容量大小: SELECTtable_schema,SUM(data_length+index_length)/1024/1024AStotal_size_mb,SUM(data_free)/1024/1024ASfree_space_mbFROMinformation_schema.TABLESWHEREtable_schema='my_database'GROUPBYtable_schema; 1....
importmysql.connector# 连接数据库cnx=mysql.connector.connect(user='用户名',password='密码',host='主机名',database='数据库名')# 创建游标对象cursor=cnx.cursor()# 执行查询语句query="SELECT table_schema AS 'Database', SUM(data_length + index_length) / 1024 / 1024 AS 'Size (MB)' FROM in...
query_cache_size：缓存MySQL中的ResultSet，也就是一条SQL语句执行的结果集，所以仅仅只能针对select语句...
SELECT table_name AS 'Table', round(((data_length + index_length) / 1024 / 1024), 2) AS 'Size (MB)' FROM information_schema.TABLES WHERE table_schema = 'database_name' ORDER BY (data_length + index_length) DESC; 在上述SQL语句中,将database_name替换为要查看表大小的数据库名称。
SET GLOBAL slow_query_log = ON;SET GLOBAL long_query_time = 1; -- 设置阈值,单位为秒 错误日志 (log_error):配置MySQL错误日志的路径。 SET GLOBAL log_error = '/path/to/error.log'; 其他配置: 临时表大小限制 (tmp_table_size和max_heap_table_size):配置临时表的内存和磁盘限制。
目前有:key_buffer_size(默认值:402653184,即384M)、innodb_buffer_pool_size(默认值:134217728即:128M)、innodb_additional_mem_pool_size(默认值:8388608即:8M)、innodb_log_buffer_size(默认值:8388608即:8M)、query_cache_size(默认值:33554432即:32M)等五个。总共:560M. 这些变量值都可以通过命令如:show...
- Are there any actul limits (practical or theoretical) for row numbers, table numbers, database size etc? - Does database size affect performance? - Would 50 tables with 3million rows present a problem? - Say I run a very simple SQL query on a table with 3million rows. Would ...
Other ways to work around file-size limits forMyISAMtables are as follows: You are using theMEMORY(HEAP) storage engine; in this case you need to increase the value of themax_heap_table_sizesystem variable. SeeSection 7.1.8, “Server System Variables”....