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-- 跨库查询
select * FROM OPENDATASOURCE(
'SQLOLEDB',
'Data Source=192.168.0.5,1433;User ID=sa;Password=sa'
).dbName.dbo.tableName

-- 打开
exec sp_configure 'show advanced options',1
reconfigure
exec sp_configure 'Ad Hoc Distributed Queries',1
reconfigure

-- 关闭
exec sp_configure 'Ad Hoc Distributed Queries',0
reconfigure
exec sp_configure 'show advanced options',0
reconfigure