Information Schema.global Variables Feature Is Disabled

System Information Schema Views (Transact-SQL). 2 minutes to read.In this articleAPPLIES TO: SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data WarehouseAn information schema view is one of several methods SQL Server provides for obtaining metadata. Information schema views provide an internal, system table-independent view of the SQL Server metadata. Information schema views enable applications to work correctly although significant changes have been made to the underlying system tables.

For SHOW statements that display information for the default database if you omit a FROM dbname clause, you can often select information for the default database by adding an AND TABLESCHEMA = SCHEMA condition to the WHERE clause of a query that retrieves information from an INFORMATIONSCHEMA table. Mysql 5.7.10使用dbforget Studio 连接异常 提示：The'INFORMATIONSCHEMA.SESSIONVARIABLES' feature is dis mysql 5.7.10使用dbforget Studio连接异常提示：The'INFORMATIONSCHEMA.SESSIONVARIABLES' feature is disabled; s.

The information schema views included in SQL Server comply with the ISO standard definition for the INFORMATIONSCHEMA. ImportantSome changes have been made to the information schema views that break backward compatibility.

These changes are described in the topics for the specific views.SQL Server supports a three-part naming convention when you refer to the current server. The ISO standard also supports a three-part naming convention. However, the names used in both naming conventions are different. The information schema views are defined in a special schema named INFORMATIONSCHEMA. This schema is contained in each database. Each information schema view contains metadata for all data objects stored in that particular database. The following table shows the relationships between the SQL Server names and the SQL standard names.

SQL Server nameMaps to this equivalent SQL standard nameDatabaseCatalogSchemaSchemaObjectObjectuser-defined data typeDomainThis name-mapping convention applies to the following SQL Server ISO-compatible views.Also, some views contain references to different classes of data such as character data or binary data.When you reference the information schema views, you must use a qualified name that includes the INFORMATIONSCHEMA schema name. For example: SELECT TABLECATALOG, TABLESCHEMA, TABLENAME, COLUMNNAME, COLUMNDEFAULTFROM AdventureWorks2012.INFORMATIONSCHEMA.COLUMNSWHERE TABLENAME = N'Product';See Also.Related Articles.