1

以下是我的查询，它需要大约 1 分钟的时间，有时会在一秒钟内给出结果，特别是我在一段时间后执行查询，或者在查询中添加了一些新关键字。看起来像一些索引问题，当我执行执行计划时，RID 查找成本为 60%。源表有大约 2-5 个 Lacs 数据，每天将添加大约 10,000-20,000 行。请给我提意见。谢谢

SELECT *
FROM   (SELECT Row_number() OVER (ORDER BY rank DESC, jobid DESC) AS rnum,
               *
        FROM   (SELECT rank,
                       joblistview.*
                FROM   joblistview,
                       FREETEXTTABLE(joblistview, jobtitle, 'seo manager') f
                WHERE  joblistview.jobid = f.[key]
                       AND CONTAINS(joblistview.joblocation, 'mumbai')
                UNION
                SELECT rank,
                       joblistview.*
                FROM   joblistview,
                       FREETEXTTABLE(joblistview, jobdescription, 'seo manager')
                       f
                WHERE  joblistview.jobid = f.[key]
                       AND CONTAINS(joblistview.joblocation, 'mumbai')
                UNION
                SELECT rank,
                       joblistview.*
                FROM   joblistview,
                       FREETEXTTABLE(joblistview, company_name, 'seo manager') f
                WHERE  joblistview.jobid = f.[key]
                       AND CONTAINS(joblistview.joblocation, 'mumbai')) AS xx)AS
       tt
WHERE  rnum BETWEEN 11 AND 20

执行计划

SQL 执行计划

4

2 回答 2

0

您是否尝试添加包含所有搜索列数据的计算列？然后将此计算列配置为持久化并使其成为全文索引。然后你可以试试

SELECT *
FROM   (SELECT Row_number() OVER (ORDER BY rank DESC, jobid DESC) AS rnum,
               *
        FROM   (SELECT rank,
                       joblistview.*
                FROM   joblistview,
                       FREETEXTTABLE(joblistview, (<<<ComputedColumn>>>), 'seo manager') f
                WHERE  joblistview.jobid = f.[key]
                       AND CONTAINS(joblistview.joblocation, 'mumbai')
               ) AS xx
       ) AS tt
WHERE  rnum BETWEEN 11 AND 20
于 2011-06-08T16:39:38.220 回答
0

您可以在单个FREETEXTTABLE搜索中指定多个列，这样就无需使用 UNION 进行多个查询。

SELECT *
FROM   (SELECT Row_number() OVER (ORDER BY rank DESC, jobid DESC) AS rnum,
               *
        FROM   (SELECT rank,
                       joblistview.*
                FROM   joblistview,
                       FREETEXTTABLE(joblistview, (jobtitle,jobdescription,company_name), 'seo manager') f
                WHERE  joblistview.jobid = f.[key]
                       AND CONTAINS(joblistview.joblocation, 'mumbai')
               ) AS xx
       ) AS tt
WHERE  rnum BETWEEN 11 AND 20
于 2010-12-03T14:36:18.237 回答