A SQL Server Computed Column is a virtual column that is not stored physically on the table, unless it is previously specified as PERSISTED.
How to: Create Indexes 项目 2014/12/03 You can use an index to speed access to data in a database table. You create an index by selecting one or more columns in a table that you want to be able to search on. You can use the index as soon as you save the table. 备注 A new...
So, now that we gained some basic knowledge and a general idea of what indexes do let’s see a few SQL Server index optimization real-world examples using SQL Server Management Studio (SSMS) to create an index and most importantly take a closer look at some performance benefits of indexes....
To create full-text indexes InServer Explorer, right-click the table for which you want to create a full-text index, and clickOpen Table Definition. The table opens inTable Designer. On theTable Designermenu, clickFulltext Index. TheFull-text Indexdialog box opens. ...
Expand the table for which you want to create the index. Right clickIndexesand selectNew Index. In theIndex namefield, enter a name for the index. In theIndex typedropdown list, selectSpatial. To specify the spatial column that you want to index, clickAdd. ...
Online index operations that create, drop, or rebuild a clustered index also require a temporary mapping index. This temporary index is used by concurrent transactions to determine which records to delete in the new indexes that are being built when rows in the source table are updated or delete...
How To: Optimize SQL Indexes How To: Optimize SQL Queries How To: Page Records in .NET Applications How To: Perform Capacity Planning for .NET Applications How To: Scale .NET Applications How To: Submit and Poll for Long-Running Tasks How To: Time Managed Code Using QueryPerformanceCounter ...
In general terms, COALESCE can influence performance, particularly inWHEREclauses. Applying COALESCE to indexed columns disables the database from using indexes. Instead, consider dealing with NULLs on the data modeling level. 5. Failing To Remember That COALESCE Can Return NULLs ...
This mature SQL database recovery tool provides the following services. Repairs corrupted SQL database files (MDF/NDF files) Recovers deleted records in SQL server Repairs damaged SQL server database components - tables, triggers, indexes, keys, rules & stored procedures Export SQL database to ...
CREATE NONCLUSTERED INDEX [IX_Customer_TerritoryID] ON [Sales].[Customer] ( [TerritoryID] ASC ) WITH (DROP_EXISTING = ON, FILLFACTOR = 90) GO Trending Articles Enable Indexes and Constraints in SQL ServerHow to Enable an Index in SQL Server Using CREATE INDEX WITH DROP_EXISTINGHow to Enab...