1. 2. 3. 其中,database_name是数据库的名称,table_name是要查看的表的名称。执行以上查询后,会返回一个包含表名称和大小的结果集。以下是一个示例: SELECT table_name, round(((data_length + index_length) / 1024 / 1024), 2) AS size_mb FROM information_schema.TABLES WHERE table_schema = 'emp...
ORDER BY data_size desc;#order by data_length desc; 查询单个库中所有表磁盘占用大小 select TABLE_NAME, concat(truncate(data_length/1024/1024,2),'MB') as data_size, concat(truncate(index_length/1024/1024,2),'MB') as index_sizefrominformation_schema.tables where TABLE_SCHEMA='mysql'group ...
To check the sizes of all of your databases, at the mysql> prompt type the following command: CopySELECT table_schema AS "Database", ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS "Size (MB)" FROM information_schema.TABLES GROUP BY table_schema; Depending on how many ...
dberr_t row_scan_index_for_mysql(row_prebuilt_t *prebuilt, const dict_index_t *index, size_t n_threads, bool check_keys, ulint *n_rows) { ... /* 进行一系列检查,满足条件后执行多线程CHECK TABLE */ if (prebuilt->select_lock_type == LOCK_NONE && index->is_clustered() && (che...
其中,column1、column2等是表中的列名,table_name是要查看的表名。下面是一个例子: SELECTSUM(LENGTH(first_name)+LENGTH(last_name)+LENGTH(email))ASdata_sizeFROMcustomers; 1. 2. 执行该语句后,将返回一个结果,表示数据的总大小。 data_size
# check database size SELECT table_schema "DB Name", Round(Sum(data_length + index_length) / 1024 / 1024 / 1024, 1) "DB Size in GB" FROM information_schema.tables GROUP BY table_schema; # check table size SELECT table_schema as `Database`, table_name AS `Table`, round(((data_...
query_cache_size query_cache_limit query_cache_min_res_unit query_cache_wlock_invalidate 1.1.2 事务相关参数 tx_isolation 和 tx_read_only 在8.0.3中移除,使用参数transaction_isolation 和transaction_read_only 替代 1.1.3 日志相关参数 expire_logs_days 设置binlog保留天数,从MySQL 8.0.11开始已经废弃,...
table_options:table_option [[,] table_option] …table_option: {AUTOEXTEND_SIZE [=] value| AUTO_INCREMENT [=] value| AVG_ROW_LENGTH [=] value| [DEFAULT] CHARACTER SET [=] charset_name| CHECKSUM [=] {0 | 1}| [DEFAULT] COLLATE [=] collation_name| COMMENT [=] ‘string’| ...
DELIMITER // CREATE TRIGGER check_table_size_before_insert BEFORE INSERT ON your_table FOR EACH ROW BEGIN DECLARE table_size INT; SELECT SUM(data_length + index_length) INTO table_size FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'your_table'; IF table_...
4)table_cache_size 计算方式 备注:TABLE_OPEN_CACHE_MIN=table_open_cache 5.定期查看open table 情况 通过show global status like ‘%Open%_table%’; 确认是否调优这个参数 6.常见故障应对: 如:在运行数据库通过 show processlist 可看到大量的 Opening tables、closing tables状态,导致应用端访问操作。