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
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
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
select tableid=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'' end from sys.indexes idx inner join sys.index_columns idxc on idx.[object_id]=idxc.[object_id] and idx.index_id=idxc.index_id left join sys.key_constraints kc on idx.[object_id]=kc.[parent_object_id] and idx.index_id=kc.unique_index_id inner join sys.objects o on o.[object_id]=idx.[object_id] inner join sys.columns c on o.[object_id]=c.[object_id] and o.type='u' and o.is_ms_shipped=0 and idxc.column_id=c.column_id where o.name='cz201' --cz201是你要查询的表
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