常见的SQL调优(SQL Tuning)Tips 建立适当的索引(参考《正确建立数据库索引的姿势》) 用UNION替换OR (适用于索引列) 用exist、not exist代替 in、not in 不要以字符格式声明数字(会使索引无效,产生全表扫描) 不要使用select * (在select后列出每一列) 不要JOIN和WHERE子句中进行计算操作(在表中用一新列来事先...
Keep in mind that the tile size you choose should also depend on whether the query window (area of interest) is already defined in the database. If the query window is defined in the database, (that is, if the spatial tables and spatial indexes already exist), then you should choose a...
I have a query that looks for the created and completed dates for outages that have overlapping times so it returns the minutes from the start to the last completed time in the group. Below image should help explain. So I have been able to research a
You use SQLCMD scripts when you have to process Windows System commands and Transact-SQL statements in the same script. Learn how to write and edit SQLCMD scripts using the Database Engine Query Editor.
Find Top N costly query plans in adhoc batches or modules...I encountered a problem about a query not using a particular indexed view in SQL Server 2005. To...Date: 10/05/2005Request for topics...Please post requests for topics or features that you would like to know about. This can...
For more information, see Tutorial: Database Engine Tuning Advisor. One goal of this optimization is to make index seeks return as few rows as possible to minimize the cost of key lookups (maximize the selectivity of the index for the particular query). If the Database Engine estimates that...
Database Tuning Advisor Execution plans In-Memory OLTP Concepts Overview of In-Memory Planning for In-Memory Natively compiled Administration of In-Memory Architecture of In-Memory T-SQL for In-Memory T-SQL for In-Memory Guide to query processing Supported T-SQL Unsupported T-SQL Unsupported featu...
For supported query hints see Query Hints (Transact-SQL). Option PERCENT This option is not supported with TOP clauses. Remove PERCENT from the query in the natively compiled stored procedure. Option WITH TIES Applies to: SQL Server 2014 (12.x) and SQL Server 2016 (13.x)This option is ...
SQL Server 2008 introduces a new technology, Resource Governor, which provides you with more control over query execution memory and CPU usage, at a variety of granularities (for example, an individual connection to SQL Server, or several groups of users in aggregate). The aim of the technology...
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