在MySQL数据库中,有时会遇到一个特定的错误,即ERROR 1109 (42S02): Unknown table 'INNODB_SYS_TABLES' in information_schema。这个错误通常意味着InnoDB存储引擎的某些内部表在information_schema数据库中无法找到。这种情况可能由多种原因引起,包括数据库损坏、InnoDB引擎的不兼容版本
2、TABLES表:提供了关于数据库中的表的信息(包括视图)。详细表述了某个表属于哪个schema,表类型,表引擎,创建时间等信息。是show tables from schemaname的结果取之此表。 3、COLUMNS表:提供了表中的列信息。详细表述了某张表的所有列以及每个列的信息。是show columns from schemaname.tablename的结果取之此表。
一般来说我们想查看目前有哪些正在跑的慢 SQL,可以用以下命令查询 information_schema 中的 processlist 表,这要求你熟悉元数据表。 mysql> select * from information_schema.PROCESSLIST where COMMAND='Query';+---+---+---+---+---+---+---+---+| ID | USER | HOST | DB | COMMAND | TIME |...
TABLE_SCHEMA The name of the schema (database) to which the table belongs. TABLE_NAME The name of the table. TABLE_TYPE BASE TABLE for a table, VIEW for a view, or SYSTEM VIEW for an INFORMATION_SCHEMA table. The TABLES table does not list TEMPORARY tables. ENGINE The sto...
ORDER ||--| PRODUCT : Contains 总结 通过以上步骤,你可以成功实现mysql库中information_schema表中记录的tables信息中数据长度和索引长度存储的大。记得根据具体情况替换相应的数据库名称和用户名,以及根据查询结果获取需要的数据长度和索引长度。希望这篇文章对你有帮助!
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information_schema.tables as tab inner join information_schema.columns as col on col.table_schema = tab.table_schema and col.table_name = tab.table_name where tab.table_type = 'BASE TABLE' and tab.table_schema not in ('information_schema','mysql', 'performance_schema','sys') -- ...
DROP SCHEMA 1. 2. 3. 4. 5. 6. 7. 因为我们删除了public,所以此时portgres数据库中没有任何的模式了,这时候我们再create table看看会发生什么。 postgres=# \dn+ List of schemas Name | Owner | Access privileges | Description ---+---+---+--- (0 rows) postgres=# create table t1(id int...
UPDATE performance_schema.setup_instruments SET ENABLED= 'YES' WHERE NAME = 'statement/sql/show_databases'; UPDATE performance_schema.setup_instruments SET ENABLED= 'YES' WHERE NAME = 'statement/sql/show_tables'; UPDATE performance_schema.setup_instruments SET ENABLED= 'YES' WHERE NAME = 'stateme...
How to list all tables that contain a specific column name in MySQL? You want to look for tables using the name of columns in them. SELECT DISTINCT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME IN('column1', 'column2') AND TABLE_SCHEMA = 'schema_name'; Or a more ...