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1.
公开(公告)号:US20100257153A1
公开(公告)日:2010-10-07
申请号:US12419039
申请日:2009-04-06
IPC分类号: G06F17/30
CPC分类号: G06F17/30442
摘要: A method, apparatus, and program product is provided to, in response to receiving a first database query for which usage of shared weight indices is prohibited, determine whether a shared weight index associated with a column of a database table referenced by the first database query can be utilized as a non-shared weight index to optimize the database query. The method, apparatus, and program product determine whether the column includes at least one changed weight value and determines whether the database query references at least one changed weight value in the column. The shared weight index is utilized to optimize the first database query in response to determining that the shared weight index can be utilized as a non-shared weight index to optimize the first database query.
摘要翻译: 提供了一种方法,装置和程序产品,用于响应于接收到第一数据库查询,对于共享权重索引的哪个使用被禁止,确定与由第一数据库查询引用的数据库表的列相关联的共享权重索引 可以用作非共享权重索引来优化数据库查询。 方法,装置和程序产品确定列是否包括至少一个改变的权重值,并确定数据库查询是否引用该列中至少一个改变的权重值。 响应于确定共享权重索引可以用作非共享权重索引来优化第一数据库查询,共享权重索引用于优化第一数据库查询。
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2.
公开(公告)号:US08140517B2
公开(公告)日:2012-03-20
申请号:US12419039
申请日:2009-04-06
CPC分类号: G06F17/30442
摘要: A method, apparatus, and program product is provided to, in response to receiving a first database query for which usage of shared weight indices is prohibited, determine whether a shared weight index associated with a column of a database table referenced by the first database query can be utilized as a non-shared weight index to optimize the database query. The method, apparatus, and program product determine whether the column includes at least one changed weight value and determines whether the database query references at least one changed weight value in the column. The shared weight index is utilized to optimize the first database query in response to determining that the shared weight index can be utilized as a non-shared weight index to optimize the first database query.
摘要翻译: 提供了一种方法,装置和程序产品,用于响应于接收到第一数据库查询,对于共享权重索引的哪个使用被禁止,确定与由第一数据库查询引用的数据库表的列相关联的共享权重索引 可以用作非共享权重索引来优化数据库查询。 方法,装置和程序产品确定列是否包括至少一个改变的权重值,并确定数据库查询是否引用该列中至少一个改变的权重值。 响应于确定共享权重索引可以用作非共享权重索引来优化第一数据库查询,共享权重索引用于优化第一数据库查询。
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