Detailed SQL Server Query table index

SELECT Index name =a.name

, table name =c.name

, indexed field name =d.name

, indexed field location =d.colid

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FROMsysindexes  a JOINsysindexkeys  b  ONa.id=b.id  ANDa.indid=b.indid JOINsysobjects  c  ONb.id=c.id JOINsyscolumns  d  ONb.id=d.id  ANDb.colid=d.colid WHEREa.indid  NOT IN(0,255) -- and  c.xtype=‘U‘  and  c.status>0 --查所有用户表 ANDc.name=‘message‘ --查指定表 ORDER BYc.name,a.name,d.name

You need to create an index such as:

Determine if there is a duplicate record based on a column, and if it is a non-primary key, create an index

Create an index based on columns that are frequently queried

No need to create an index

The field content is mostly the same, for example: male, female

Do not create indexes on all columns, which increases the maintenance overhead time when new records are created.

Oracle Query User table index

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1	selectindex_name,index_type,table_name from user_indexes wheretable_name=‘表名‘

SQL Server queries the index on a table

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SELECTTableId=O.[object_id],TableName=O.Name,IndexId=ISNULL(KC.[object_id],IDX.index_id),IndexName=IDX.Name,IndexType=ISNULL(KC.type_desc,‘Index‘),Index_Column_id=IDXC.index_column_id,ColumnID=C.Column_id,ColumnName=C.Name,Sort=CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id,‘IsDescending‘)WHEN 1 THEN ‘DESC‘ WHEN 0 THEN ‘ASC‘ ELSE ‘‘ END,PrimaryKey=CASE WHEN IDX.is_primary_key=1 THEN N‘√‘ELSE N‘‘ END,[UQIQUE]=CASE WHEN IDX.is_unique=1 THEN N‘√‘ELSE N‘‘ END,Ignore_dup_key=CASE WHEN IDX.ignore_dup_key=1 THEN N‘√‘ELSE N‘‘ END,Disabled=CASE WHEN IDX.is_disabled=1 THEN N‘√‘ELSE N‘‘ END,Fill_factor=IDX.fill_factor,Padded=CASE WHEN IDX.is_padded=1 THEN N‘√‘ELSE N‘‘ ENDFROM sys.indexes IDX INNER JOIN sys.index_columns IDXCON IDX.[object_id]=IDXC.[object_id]AND IDX.index_id=IDXC.index_idLEFT JOIN sys.key_constraints KCON IDX.[object_id]=KC.[parent_object_id]AND IDX.index_id=KC.unique_index_idINNER JOIN sys.objects OON O.[object_id]=IDX.[object_id]INNER JOIN sys.columns CON O.[object_id]=C.[object_id]AND O.type=‘U‘AND O.is_ms_shipped=0AND IDXC.Column_id=C.Column_id where O.name=‘cz201‘ --cz201是你要查询的表

The above content is all described in this article, I hope you like.

Detailed SQL Server Query table index