1:sys.dm_db_index_usage_stats返回索引的被使用的信息,但是这个DMV视图中的数据是自数据库服务启动以来累计收集的数据(只要重启SQL Server服务,该视图的计数器就初始化为空。而且,当分离或关闭数据库时(例如,由于 AUTO_CLOSE 设置为 ON),便会删除与该数据库关联的所有记录。),所以,如果数据库只运行了几天,那...
number of operations done not the actual rows affected. For example, if you delete 1000 rows in one statement, this count increments by 1 我们可以使用下面SQL语句查找当前数据库中的未使用索引(unused index): SELECT 'SQL Server Instance Start with ' + CONVERT(VARCHAR(16),create_date,120) FROM ...
1:sys.dm_db_index_usage_stats返回索引的被使用的信息,但是这个DMV视图中的数据是自数据库服务启动以来累计收集的数据(只要重启SQL Server服务,该视图的计数器就初始化为空。而且,当分离或关闭数据库时(例如,由于 AUTO_CLOSE 设置为 ON),便会删除与该数据库关联的所有记录。),所以,如果数据库只运行了几天,那...
Monitoring your SQL Server index usage and taking the time to find unused indexes in SQL Server can enable you to take charge of your SQL Server performance, organization, and resource allocation, which ultimately helps the business run more effectively. When you analyze SQL Server index usage st...
Managementbut ive created a more specific query for unused indexes which lets me quickly identify which indexes are not being used or have never been used in a database. This query goes a step further to find how much space could be saved and creates the dynamic sql to drop the indexes....
schema_unused_indexes视图字段含义如下: object_schema:schema名称 OBJECT_NAME:表名 INDEX_NAME:未使用的索引名称 视图定义语句 CREATE OR REPLACE ALGORITHM = MERGE DEFINER = 'root'@'localhost' SQL SECURITY INVOKER VIEW schema_unused_indexes ( object_schema, object_name, index_name ) AS SELECT object...
如果索引列包含 LOB对象的话,在SQL Server 2005/2008/R2中rebuild index online会失败。在sql server 2012中,即使索引列包含LOB对象,也可以rebuild index online了,可以参考 Online Index Operations for indexes containing LOB columns. offline模式下 rebuilde index会对table上锁,所有对这个table的读写操作都会被...
Of course you shouldn’t simply drop the unused indexes. This patch, like any patch, should probably only be used on a non-production server. A non-production server, no matter how much you try, will NOT have the same queries and data as a production server (you could dump the SQL ge...
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This view is most useful when the server has been up and processing long enough that its workload is representative. Otherwise, presence of an index in this view may not be meaningful. The schema_unused_indexes view has these columns: object...