检索效率通常采用的衡量指标有（　）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32389' and id < 2573434 and id<>'2573434' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32389' and id > 2573434 and id<>'2573434' order by id asc limit 5