SELECT 索引名称=a.name
,表名=c.name
,索引字段名=d.name
,索引字段位置=d.colid
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FROM sysindexes a JOIN sysindexkeys b ON a.id=b.id AND a.indid=b.indid JOIN sysobjects c ON b.id=c.id JOIN syscolumns d ON b.id=d.id AND b.colid=d.colid WHERE a.indid NOT IN(0,255) -- and c.xtype='U' and c.status>0 --查所有用户表 AND c.name='message' --查指定表 ORDER BY c.name,a.name,d.name |
需创建索引 例如：
根据某列判断是否有重复记录，如果该列为非主键，则创建索引
根据经常查询的列，创建索引
无须创建索引
字段内容大部分一样，例如：男，女
不要给所有的列都创建索引，这样在创建新记录时，增加维护开销时间。
Oracle 查询用户表索引
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select index_name,index_type,table_name from user_indexes where table_name='表名' |
SqlServer查询一个表上的索引
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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 |
以上内容就是本文全部所述，希望大家喜欢。
