公开(公告)号：US20150278327A1

公开(公告)日：2015-10-01

申请号：US14231438

申请日：2014-03-31

Applicant: Oracle International Corporation

Inventor： Ananth Raghavan ,  George Eadon ,  Ramesh Kumar ,  Hermann Baer ,  Suresh Sridharan

IPC: G06F17/30 ,  G06F9/46

CPC classification number: G06F17/30339 ,  G06F9/466

Abstract: Techniques for maintaining a global index in response to a partition being dropped are provided. In response to an instruction to drop a partition, partition identification data that identifies the partition is stored. Index entries, in the global index, that correspond to the dropped partition become “orphaned” entries. Later, an execution plan for a query is processed, where the execution plan targets a global index. During execution of the execution plan, one or more index entries are accessed. For each accessed index entry, the partition identification data is analyzed to determine if the index entry is an orphaned entry. If so, then the index entry is ignored for purposes of the query. Later, the global index may be updated to delete each orphaned entry. Such deletion may occur much later, such as during a time when the database is not queried or updated frequently.

Abstract translation: 提供了用于维护响应于正在丢弃的分区的全局索引的技术。 响应于删除分区的指令，存储识别分区的分区标识数据。 在全局索引中，对应于删除的分区的索引条目将成为“孤立”条目。 之后，处理查询的执行计划，其中执行计划定位到全局索引。 在执行计划的执行期间，访问一个或多个索引条目。 对于每个访问的索引条目，分析分区标识数据以确定索引条目是否是孤立条目。 如果是这样，则为了查询的目的，忽略索引条目。 之后，可能会更新全局索引以删除每个孤立的条目。 这种删除可能发生得更晚，例如在数据库未被查询或频繁更新的时间内。

公开(公告)号：US20150278275A1

公开(公告)日：2015-10-01

申请号：US14231416

申请日：2014-03-31

Applicant: ORACLE INTERNATIONAL CORPORATION

Inventor： Ramesh Kumar ,  Ananth Raghavan ,  George Eadon

IPC: G06F17/30 ,  G06F9/46

CPC classification number: G06F9/466 ,  G06F16/22 ,  G06F16/2308

Abstract: Techniques for processing “destructive” database statements are provided. Destructive database statements, when processed, cause metadata of a database object to be changed. Examples of such database statements include ones that delete an index, that set a column as unused, and that drop a constraint on a column. When such a statement is received, a change is made to metadata of a database object. Such a metadata change may involve setting an index as unusable, disabling a constraint, or invalidating a cursor. After the metadata change, a first time is determined. Then, it is determined when one or more database transactions that were pending at the first time have committed. After those database transaction(s) have committed, one or more operations are performed, such as dropping an index or dropping a constraint.

Abstract translation: 提供了处理“破坏性”数据库语句的技术。 破坏性数据库语句在处理时会导致要更改数据库对象的元数据。 这样的数据库语句的示例包括删除索引，将列设置为未使用的列，并删除列上的约束。 当收到这样的语句时，会对数据库对象的元数据进行更改。 这样的元数据改变可能涉及将索引设置为不可用，禁用约束或使游标无效。 元数据更改后，首次确定。 然后，确定在第一次挂起的一个或多个数据库事务已经提交。 在这些数据库事务已经提交之后，执行一个或多个操作，例如删除索引或删除约束。