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 ...
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...
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...
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 ...
# 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_...
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
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。
12.4 Limits on Table Size The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL internal limits. For up-to-date information operating system file size limits, refer to the documentation specific to your operating system...
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,...