sql server 2008 - WITH clause performance issues; Rewrite into While Loop? -


i looking @ areas optimize of our stored procedures , have run across in performance analysis, chunk of sql in stored proc performing terribly. i've done research , i've read using clause when don't have unique records no-no rewrite having troubles. i'm thinking while loop may best bet in order achieve result after cannot hierarchy of data populate correctly (specifically [level] field). here chunk of sql trying rewrite. suggestions/ideas tremendously appreciated.

;with rulechart (   ruleid,    ruledetailid,    ruleunitgroupid,    parentruleunitgroupid,    [level],   isnextruleunitgroupavailable ) (    select      distinct rd.ruleid,      rd.ruledetailid,      rd.ruleunitgroupid,      rd.parentruleunitgroupid,      0 [level],     rd.isnextruleunitgroupavailable   #ttblruledetail rd        rd.ruleid in (         select ruleid          #ttblrule          resultid in (           select resultid           #ttblresultunit         )     )     , rd.parentruleunitgroupid null      union      select        rd.ruleid,        rd.ruledetailid,        rd.ruleunitgroupid,        rd.parentruleunitgroupid,        [level] + 1,       rd.isnextruleunitgroupavailable            #ttblruledetail rd       inner join rulechart rc          on           rd.parentruleunitgroupid = rc.ruleunitgroupid           , rd.ruleid=rc.ruleid )

a lot depends on size of temp tables you're utilizing. how big they, create indexes on them prior clause? looking @ statement looks create index on #ttblruledetail.ruleid, , on #ttblruledetail.parentruleunitgroupid. performance, better approach eliminate temp tables altogether, because may have indexes on source tables speed query.


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