标签：技术分享 rem tables opera 元数据 add sar 数据库名 src
| Column name | Description |
| ID | 外键的名字，前面是schema（数据库）的名字，后面是外键约束的名字 |
| FOR_NAME | 数据库名字加上表名字 |
| REF_NAME | 数据库名字加上约束的名字 |
| N_COLS | 列的顺序再外键约束当中 |
| TYPE | A collection of bit flags with information about the foreign key column, ORed together. 1 = ON DELETE CASCADE, 2 = ON UPDATE SET NULL, 4 = ON UPDATE CASCADE, 8 = ON UPDATE SET NULL, 16 = ON DELETE NO ACTION, 32 = ON UPDATE NO ACTION. |
| Column name | Description |
| TABLE_ID | 顾名思义这个就是表ID |
| NAME | 表名称，不过制定的是INNODB，别的引擎是不会被记录下来的 |
| STATS_INITIALIZED | 代表统计信息已经收集过了, Uninitialized 就代表还没有收集统计信息 |
| NUM_ROWS | 预估的表中数据的行数，每次更新插入后都会重新修改。如果有未提交的插入或者删除的事物的话，会影响这个表的精度 |
| CLUST_INDEX_SIZE | 聚集索引在物理磁盘存储的页有多少，如果为NULL的话就证明这个表的统计数据还没有收集 |
| OTHER_INDEX_SIZE | 非聚集索引在物理磁盘存储的页有多少，如果为NULL的话就证明这个表的统计数据还没有收集 ble. |
| MODIFIED_COUNTER | The number of rows modified by DML operations, such as INSERT, UPDATE, DELETE, and also cascade operations from foreign keys. This column is reset each time table statistics are recalculated。数据操作的次数，insert，update等信息。 |
| AUTOINC | The next number to be issued for any auto-increment-based operation. The rate at which the AUTOINC value changes depends on how many times auto-increment numbers have been requested and how many numbers are granted per request. |
| REF_COUNT | When this counter reaches zero, the table metadata can be evicted from the table cache. |
标签：技术分享 rem tables opera 元数据 add sar 数据库名 src
原文地址：http://www.cnblogs.com/shengdimaya/p/6916063.html
