sql server index hint

First, the basic concept of indexed viewsAn indexed view is actually a view that "materialized" a set of unique values into a clustered index, which is materialized almost as a table, and its data is stored in one copy (it consumes hard disk space, but the query is fast, for example, you can set count (), sum () in an indexed view). The advantage is that it provides a very quick way to find the information behind the view. After the first

Weekend finally moved out of the rental, installed broadband .... Only to find the days without the net ... What a kind of isolation it is ... Can't stand that kind of day anymore .... Well, since the netAnn's up, and I have to go on with this series.Indexes and locks, these two topics are very important to our development engineers ... Only by understanding these two topics can we write high-quality SQL statements, in the previous blog, I saidIndexes

This index cannot be designed from the design view of the data (or it may not be found!). ）[SQL]View PlainCopy CREATE INDEX ix_contractdetail_quantity On Contractdetail (Costid, substatus, Note) INCLUDE (Quantity); And the only difference between the normal index is the addition of an include labe

choose from, there are scenarios and scenarios where it is not applicable. With good, the query can be raised from a few hours to a few seconds, with bad, you can reduce a query from a few seconds to a few hours. This article does not intend to discuss the internal mechanism of the index too deeply, and more detailed information can be read in the sixth chapter of the Art of SQL

It is understood that most developers have a smattering of understanding of the index, limited to most of the daily work no opportunity, what is not necessary to care about, understand the index, it is really a query too slow to find the query conditions to build an index on OK, which day again a query slow, and then establish an

, click Next 4. "Select the database object to script", you can not set it, click "Next" 5. Click on the "Advanced" button to the right of [save to file], in the dialog box, set "script for server version" to "SQL Server 2008", set "type of data to script" to "schema and data". Choose where to save the script 6. Next, next step. Export completeTo put the exported

bookmark lookup under the b-tree structure is: random io, the performance cost of random Io is very large, and for this reason SQL Server discards this way, directly from the table Scan (table seek) or the clustered Index Scan (index seek) to get the data directly. The above part of the content, I have in the first ar

necessary, and later I use another computer to connect my computer, found everything as usual, and there is no useful diaryAttracted by the wonderful play of a boxThen I went to find this diary and found ... I'll try /log 's order when the wood has the catalogue.Because the computer does not install VS, just SQL Server, and then try the following command: = = "start running = =" "ssms/log"And I found out t

If we want to optimize the database, we can use the following five methods to optimize the database system: If we want to optimize the database, we can use the following five methods to optimize the database system: 1.1.1 Summary If we want to optimize the database, we can optimize the database system using the following five methods. 1. Computer hardware optimization 2. Application Optimization 3. Database INDEX OPTIMIZATION 4.

SQL Server discards this way, directly from the table Scan (table seek) or the clustered Index Scan (index seek) to get the data directly.The above part of the content, I have in the first article in the previous introduction, you can click to view.It's too cumbersome to describe, as an example to explain:SELECT order

you include columns rather than placing them on the on list, SQL Server adds them only at the leaf level of the index. Because each row on the index leaf level corresponds to a single row of data, what you do is essentially include more raw data at the leaf level of the index