摘要： Cache Notifications in SQL Server 2000 or SQL Server 7 ASP.NET uses a polling model for SQL Server 2000 and SQL Server 7. Older versions of SQL Server and other databases aren’t supported (although third parties can implement their own solutions by creating a custom dependency class). With the polling model, ASP.NET keeps a connection open to the database and uses a dedicated thread to check periodically if a table has been updated. The effect of tying up one connection i 阅读全文