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to whether the table has an index, and the index is clustered or nonclustered, the organization has the following three kinds: 1. Heap A heap is a table that does not contain a clustered index. There is a row in the heap's sys.partitions, and index_id = 0 For each partition used by the heap. There is only one partition, in the system table, for each allocation u
In the previous article, du Fei introduced the page types of SQL Server data files, the system manages the table's storage structure logically Based on the 96-byte header information and the system table. In the previous article, du Fei introduced the page types of SQL Server data files, the system manages the table's
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 the index
do not match the existing one. Although it is quite risky for running systems. However, you can perform a critical test. The specific solution is as follows: First, regularly capture the cache execution plan on the Hot Standby Database Server (I originally wanted to capture the SQL and found that some SQL statements are really not supported, and there is no poss
Oracle Database indexes are the structures on disks associated with tables or views. We can retrieve rows from tables or views more quickly. Oracle Database indexes mainly contain keys generated by one or more columns in a table or related view. These keys are stored in a structure (B tree ). 1. Index in SQL Server So that SQ
MyISAM engines), primary key index, and level two index.The index structure in the MySQL InnoDB engineIn the primary key index, the leaf node contains the data row (data page), the leaf interface of Level Two index, the key value of the primary key index (the primary key
InArticleThe SQL Server View is actually an SQL statement. When the view is called, it dynamically executes the defined SQL statement and returns the result set. After SQL server2005, Microsoft launched the index view. The
all the indexes that do not match the existing one. Although it is quite risky for running systems. However, you can perform a critical test. The specific solution is as follows: First, regularly capture the cache execution plan on the Hot Standby Database Server (I originally wanted to capture the SQL and found that some SQL statements are really not support
capture the cache execution plan on the Hot Standby Database Server (I originally wanted to capture the SQL and found that some SQL statements are really not supported, and there is no possibility of automatic resolution ), then, together with the execution times of the execution, that is, the statistical information of the table, it is down to the data table of
What is an index A database index is a structure that sorts the values of one or more columns of a table, and the relationship of the index to the table data is similar to the relationship between the catalog and the content of the book. There are two more important indexes in Sql-
SQL Server insert efficiency (heap table vs clustered index table) "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 aske
@ @FETCH_STATUS=0BEGINIF@PctFragBetween20.0and40.0BEGINSET@Defrag= N‘ALTER INDEX‘+@IndexName+‘On‘+@DBName+‘.‘+@SchemaName+‘.‘+@TableName+‘REORGANIZE‘EXEC sp_executesql@DefragPRINT‘Reorganize Index:‘+@DBName+‘.‘+@SchemaName+‘.‘+@TableName+‘.‘+@IndexNameENDELSEIF@PctFrag>40.0BEGINSET@Defrag= N‘ALTER INDEX‘+@IndexName+‘On‘+@DBName+‘.‘+@SchemaName+‘.‘+@TableName+‘REB
This article is "Stairway Series:Part of the ladder for SQL Server indexingIndexes are the basis of database design and tell developers to use the database with regard to the designer's intentions. Unfortunately, when performance problems arise, indexes are often added as an afterthought. The end here is a simple series of articles that should enable them to quickly make any database professional "fast"Thro
of records per row can only be 8k, which is why char and varchar are limited to 8k in size, and storing more than 8k of data should use the text type. In fact, the text type of the field value can not be directly entered and saved, it is to store a pointer to a number of 8k data page composed of the expansion area, the real data is actually placed in these data pages.When to set the index1. Define a data column for the primary key (SQL
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
The following is an example of SQL Server full-text index. For more information about how to create a full-text index using the system stored procedure, see: 1) Start the full-text processing function of the database (sp_fulltext_database) 2) create a full-text directory (sp_fulltext_catalog) 3) register in the full-te
The traditional relational database service engine is often not the best platform for analyzing and computing ultra-large amounts of data, so SQL Server has developed an analytics service engine to analyze and calculate large amounts of data. Of course, for the data storage platform SQL Server database engine, there is
the cache execution plan on the Hot Standby Database Server (I originally wanted to capture the SQL and found that some SQL statements are really not supported, and there is no possibility of automatic resolution ), then, together with the execution times of the execution, that is, the statistical information of the table, it is down to the data table of a backu
clustered index makes the data in the table orderly based on the key-value contact. Deciding which key value to use as a clustered key is an important factor, and when traversing to the leaf level, you can get the data itself rather than simply getting a pointer to the data (nonclustered index data is not overwritten). The clustered index has a row in the Sys.pa
, SQL Server uses three methods to implement this grouping, and the first one requires your assistance: Happy to find data series that have been pre-categorized by the component group. by executing a set of data Hash operation. Sorts the order in which the data is grouped. Pre-classificationThe index of the pre-categorized data is your way,
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