发明名称 |
Adding entries to an index based on use of the index |
摘要 |
In an embodiment, a threshold value is calculated for a current entry in a first column of an index. If the current entry has been read a number of times by execution of an execution plan that is more than the threshold value and the current entry points to at least one row in a table and not all of the at least one row have been selected by the execution plan for inclusion in a result set as satisfying a query that the execution plan implements, then a new entry is added to the index. |
申请公布号 |
US8396858(B2) |
申请公布日期 |
2013.03.12 |
申请号 |
US201113207954 |
申请日期 |
2011.08.11 |
申请人 |
EGAN RANDY L.;MITTELSTADT ROGER A.;MURAS BRIAN R.;INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
EGAN RANDY L.;MITTELSTADT ROGER A.;MURAS BRIAN R. |
分类号 |
G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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