sphinx 增量索引与主索引使用测试

2013年10月28日 15:01:16

首先对新增的商品建立增量索引,搜索时只使用增量索引:

 array (size=1)
   0 =>
     array (size=6)
       'gid' => string '300233' (length=6)
       'weight' => string '1500' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)

新商品的id: 权重:

然后重建主索引,搜索时只使用主索引:

 2 =>
     array (size=6)
       'gid' => string '300231' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)
   3 =>
     array (size=6)
       'gid' => string '300232' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)
   4 =>
     array (size=6)
       'gid' => string '300233' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)

此时,那个新商品(id:)的权重变为

再然后搜索时同时使用增量索引和主索引

 $sphObj->query($keyword, 'goods,goods_zl');

 2 =>
     array (size=6)
       'gid' => string '300231' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)
   3 =>
     array (size=6)
       'gid' => string '300232' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)
   4 =>
     array (size=6)
       'gid' => string '300233' (length=6)
       'weight' => string '1500' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)

此时的结果说明:增量索引中该新商品覆盖掉了主索引中的那个商品, but why!?

然后一个有意思的测试,在查询时调换下两个索引的前后顺序(第一行代码),结果:

 $sphObj->query($keyword, 'goods_zl,goods');

 2 =>
     array (size=6)
       'gid' => string '300231' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)
   3 =>
     array (size=6)
       'gid' => string '300232' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)
   4 =>
     array (size=6)
       'gid' => string '300233' (length=6)
       'weight' => string '1690' (length=4)
       'comweight' => float 1
       'ge' => string '70' (length=2)
       'ce' => string '34' (length=2)
       'mysum' => string '104' (length=3)

结论,相同的商品在主索引和增量索引中只保留一个,根据查询语句中的顺序后者索引会覆盖掉前边索引里相同的商品(或文档)

还有诡异的事情,未完待续... ...