Here’s how to create different types of indexes, along with specifying index columns and names: 1 2 CREATE [UNIQUE] INDEX index_name ON table_name (column1 [, column2, ...]); Explanations: –CREATE INDEX: Initiates the creation of an index. –UNIQUE (optional): Specifies that the ...
En radgrupp där all data har tagits bort övergår från KOMPRIMERAD till TOMBSTONE och tas senare bort av en bakgrundsprocess som heter tuple-mover. Mer information om status för radgrupper finns i sys.dm_db_column_store_row_group_physical_stats (Transact-SQL). Tips Om du har...
Refresh Refreshes the Index object and its properties. (覆盖 ScriptNameObjectBase. . :: . .Refresh() () () ()。) Rename Renames the index. RenameImpl This method supports the SMO infrastructure and is not intended to be used directly from your code. (从 NamedSmoObject 继承。) RenameImp...
The selection of the right indexes for a database and its workload is a complex balancing act between query speed and update cost. Narrow disk-based rowstore indexes, or indexes with few columns in the index key, require less disk space and maintenance overhead. Wide indexes, on the oth...
The following table lists the index operations and disallowed index types. Expand table Using the keyword ALL with this operationFails if the table has one or more REBUILD WITH ONLINE = ON XML indexSpatial indexColumnstore index in SQL Server 2017 (14.x) and older versions only. Later ...
The following table lists the index operations and disallowed index types. Expand table Using the keyword ALL with this operationFails if the table has one or more REBUILD WITH ONLINE = ON XML indexSpatial indexColumnstore index in SQL Server 2017 (14.x) and older versions only. Later ...
addAttributeToGroup(String, String) - Method in class com.endeca.portal.explore.model.UnivariateSortAndGroupAnalysis addAttrValue(String) - Method in class com.endeca.portal.compare.model.CompareGridRecordModel addBinningSelect(List<Select>, String) - Static method in class com.endeca.portal.explore...
You can also specify a table by naming its index file (the file with the .MYI suffix). If you do not invoke myisam_ftdump in the directory where the table files are located, the table or index file name must be preceded by the path name to the table's database directory. Index ...
group size is related to table cardinality, which is the number of value groups. TheSHOW INDEXstatement displays a cardinality value based onN/S, whereNis the number of rows in the table andSis the average value group size. That ratio yields an approximate number of value groups in the ...
Therefore, an active heap or index will likely always have its metadata in the cache, and the cumulative counts may reflect activity since the instance of SQL Server was last started. The metadata for a less active heap or index will move in and out of the cache as it is used. As a ...