sql server columnstore index

"Which of the following is more efficient for SQL Server insert operations in heap tables or clustered index tables? Why is it high ?" Some colleagues have asked me this question before. To ensure the record efficiency of the logstore, I did a simple test. I should first emphasize the following concepts: Heap table:For a table without clustered indexes, th

The following is an example of a full-text index for SQL Server databases, as in the pubs database. Need a friend under the reference first, introduce the steps to create a FULL-TEXT index using system stored procedures: 1 ) to start the Full-text processing function of the database (sp_fulltext_database) 2 ) to

SQL Server in the eyes of programmers-what does non-clustered index bring to us ?,Zookeeper I will not talk about some database concepts, so I can only use some practices to understand the meaning of these concepts. The use cases in the following application scenarios are virtualized and used only for personal research. Programmers should be curious, though this

An example of full-text index of the SQL Server database, using the pubs database as an example. The following describes how to create a full-text index using the system stored procedure: 1) Start the full-text processing function of the database (sp_fulltext_database) 2) create a full-text directory (sp_fulltext_catal

An example of full-text index of the SQL Server database, using the pubs database as an example.The following describes how to create a full-text index using the system stored procedure: 1 (Sp_fulltext_database) 2 ) Create a full-text directory (sp_fulltext_catalog) 3 (Sp_fulltext_table) 4 (Sp_fulltext_column)

Label:Originally found using the clustered index primary key, confirming that it is not a primary key problem, is a clustered index problem. Version:microsoft SQL Server R2 (SP1) -- Create a test table - drop table [testtable] Create table [dbo].[ TestTable] ( [id] [int] NOT NULL, [name] [varchar] (a) NOT null ) go

SQL Server Index Structure and usage (III)Author: freedk I. An in-depth understanding of the index structureIi. Improve SQL statements General paging display and storage process for small data volumes and massive data Creating a Web application requires paging. This problem

; +----+-------------+-------+-------+---------------+---------+---------+------+------+-------+ | id | select_ Type | Table | Type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+-------+---------------+---------+---------+------+------+-------+ | 1 | Simple | film | index | NULL | PRIMARY | 2 | NULL | 55 | NULL | +----+-------------+-------+-------+---------------+---------+---------+

A recent project involving SQL Server 2008, because of business requirements, wanted to establish a unique index, but found that in SQL Server, a unique index field cannot have multiple null values, and the following is an error m

An example of a complete Full-text index for a SQL Server database. (for example, in the pubs database) First, describe the steps to create a FULL-TEXT index using system stored procedures: 1 full-text processing of the start database (sp_fulltext_database) 2) Establishment of Full-text catalogs (sp_fulltext_catalog) 3

the view to the underlying base table. If the SELECT statement in the view definition specifies a GROUP by clause, the key for a unique clustered index can only refer to the column specified in the GROUP by clause. The SELECT statement in the view cannot contain the following Transact-SQL syntax elements:The select list cannot specify columns using the * or table_name.* syntax. You must explicitly give the

Misunderstanding of SQL Server clustered index and primary key Many people may mix the primary key and clustered index, or think this is the same thing. This concept is very incorrect. A primary key is a constraint attached to an index. This

Tags: style blog http color SP strong file data onA high level of understanding of SQL Server concurrency processing, indexing, GC, and caching is essential in the process of advanced programmer progress, which has recently been discovered. Therefore, to prepare for the future, decided to make a copy of the relevant documents.Hope to oneself, to Bo friends have certain help.A: Basic concepts1. Purpose of th

Original article from: Http://www.mssqltips.com/sqlservertip/1239/how-to-get-index-usage-information-in-sql-server/ Reproduced from: http://blog.csdn.net/dba_huangzj/article/details/7777392Problem: The database has two storage requirements: data pages and index pages. Understanding and viewing actual data in your table

Method for querying the last Rebuild time of SQL Server Index, sqlrebuild A friend has a Job that usually stops executing a Rebuild Index and asked me if I can check which indexes have been rebuilt. We thought that Sys. index or Sys. objects would store similar information

server| Example | data | database | Index First, describe the steps to create a FULL-TEXT index using system stored procedures: 1 full-text processing of the start database (sp_fulltext_database) 2) Establishment of Full-text catalogs (sp_fulltext_catalog) 3 to register a table in the Full-text catalog that requires Full-text indexing (sp_fulltext_table) 4 indic

One, include for nonclustered indexesThe Include property of a nonclustered index allows a nonclustered index to contain additional columns. Such asCREATE nonclustered INDEX [nonixuser] on [dbo]. [Users]([NAME] Asc)INCLUDE ([ID], [creattime]) GOThis table statement adds the ID on the nonclustered index of the name colu

,index_depth,index_level,page_count,record_count,cast (avg_ Fragmentation_in_percent as DECIMAL (6,2)) as Avg_fragmentation_in_percent,fragment_count,avg_fragment_size_in_ Pages,cast (avg_page_space_used_in_percent as DECIMAL (6,2)) as Avg_page_space_used_in_percent from Sys.dm_db_index_ Physical_stats (db_id (), object_id (N ' dbo. Firsttable '), Null,null, ' detailed ') IF object_id (' dbo. Secondtable ') is not nulldrop TABLE dbo. secondtable; SELECT Index_type_desc,index_depth,index_level,pa

In SQL Server, there are two types of indexes (clustered index and non-clustered index) in name, but there are actually three types of indexes internally.Clustered index non-clustered index: Non-clustered

(path, ' "66,480") (0 rows affected) ！！！ What's the situation!? We said before, "66,480" will be mistaken for split, so the search term here can not be so written, you may write a space, you can also write a semicolon, anyway, it is impossible to use a comma, the query instead of SELECT * from Pathtest where FREETEXT (path, ' "66 480" ') (49 rows affected) SELECT * from Pathtest where FREETEXT (path, ' "480") (1 rows affected) Okay, this is consistent with the expected results. Five, PostScri