发明名称 |
Executing nested subqueries of parallel table functions in the parallel single cursor model |
摘要 |
Techniques are provided for processing a database statement that includes a table function capable of parallel execution, where the input of the table function is specified in a subquery. During compilation of the database statement, a global cursor is generated for the database statement. The global cursor includes a first plan component for executing the table function and a second plan component for generating input for the table function. A "dummy" cursor is then generated. When slaves execute the table function, they call the dummy cursor for input. When a slave calls the dummy cursor for input, the dummy cursor causes a context switch back to the global cursor, so that the second plan component within the first cursor generates the input for the slave.
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申请公布号 |
US2005131880(A1) |
申请公布日期 |
2005.06.16 |
申请号 |
US20040930433 |
申请日期 |
2004.08.30 |
申请人 |
ORACLE INTERNATIONAL CORPORATION |
发明人 |
YOAZ ADIEL;CRUANES THIERRY;GHOSH BHASKAR;MURALIDHAR SUBRAMANIAN |
分类号 |
G06F7/00;(IPC1-7):G06F7/00 |
主分类号 |
G06F7/00 |
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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