rebuild index sql server

SQL Server Performance Tuning 3 Index MaintenancePreface The previous article introduced how to improve database query performance by creating indexes, which is just the beginning. If you do not need proper maintenance in the future, the indexes you have previously created may even become a drag-and-drop attack and a helper for database performance degradation.Se

beginning of the filter conditions, determine how many page queries to determine the initial criteria to meet the data, and then further filteringIf the data range that satisfies the query condition is determined relatively accurately at the very beginning, the data that satisfies the condition can be finally confirmed by a relatively small price.If the data range that satisfies the query condition is determined relatively vaguely at first, the cost of the process is relatively large, although

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

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

SQL Server index maintenance2012-03-08 00:30:09|Category: Default Categories | Tags:SQL Server Index | Report | Font size Subscription Pages Extents (pages and extents)The most basic data storage unit for SQL

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

Q: Under what conditions do I need to rebuild the index? Answer: The following two conditions are required to rebuild the index. One: After the analysis (analyze) specifies the index, the query index_stats the value of the Height field, if this value >=4, it is best to

SQL Server Defragment index fragmentation testThe way SQL server organizes indexes is just a few, and always smart to join the intelligent judgment very uncomfortable, or worse than Dbms_advisor:1SQL SERVER 2000/2005Inquire

Querying the index of a specified tableSELECTT1. Table_name,t1. Index_name,t1. Index_type,t1. Uniqueness,t1. Table_owner,t1. Status,t1. Funcidx_status fromall_indexes T1WHERET1. Table_owner= UPPER('owner') andT1. table_name= UPPER('table_name')ORDER byT1. STATUSDESC;Normal index invalidation, except primary key and uniqueness index (to ensure data normalization)

extension. The space page is dedicated to the allocation and management of data spaces, including: PFS pages (page free space): Record whether a page is assigned, in a mixed or consistent extension, and how much space is available on the page; Gam page (Global allocation MAP) and Sgam page (secodary Global allocation map): Used to record the location of an idle extension or a mixed extension containing free pages. Sqls Comprehensive utilization of these three types of paging files creates a new

Introduction to the index:Indexes are clustered and nonclustered, and the index in the database is similar to a book's directory, where you can quickly find the information you want in a book, without having to read through the books.The main purpose of the index is to improve the performance of the SQL Server system,

Label:The leaf page of a clustered index stores the table's data. As a result, table rows are physically sorted by clustered index columns, because table data can only have one physical order, so a table can have only a single clustered index. When we create a PRIMARY key constraint, if there is no clustered index and

) 2. View indexes: (1) use SQL ServerManagement Studio to view index information (2) Use the system stored procedure to query index information. Use SP_helpindex to return all index information in the table. For example, you can view the index information of the course tabl

indexed containing field originates from SQL Server 2005,sql Server 2008 and 2012. It allows you to include non-key value (Non-key) fields in a nonclustered index that are not counted in the index (so that we are less likely to p

Copy Code code as follows: --begin Index (index) analysis optimization related SQL --Returns an index with more than 25% of the current database fragmentation rate --Running this statement scans a lot of data pages --Avoid running when the system load is relatively high --Avoid running when the system load is

Tags: width image black rebuild requires Har index Primary CenterThe leaf page of a clustered index stores the table's data. As a result, table rows are physically sorted by clustered index columns, because table data can only have one physical order, so a table can have only a single clustered

ObjectiveThe previous article describes how to improve the query performance of a database by building an index, which is really just the beginning. Subsequent to the lack of proper maintenance, the index you created earlier can even become a drag, becoming an accomplice to the decline in database performance.Find FragmentsEliminating fragmentation may be the most common task for

Tags: Uid window ext code mic method percent database URLThe SQL Server version is R2. SQL statement (source) for querying database index fragmentation conditions: SELECT object_name (Ind. OBJECT_ID) as TableName, ind.name as IndexName, Indexstats.index_type_desc as Indextype, indexstats.avg_ Fragmentation_in_percen

A few days ago received a project need to periodically rebuild the index task, first try the Java with the timer, do not know that it is not enough for the timer's understanding of the reasons, I feel that the timer function is a little weak, can not meet my needs: a certain period of time to be in a certain cycle to carry out the task, And these times are available for the customer to configure. Finally, t