发明申请
US20120096054A1 READING ROWS FROM MEMORY PRIOR TO READING ROWS FROM SECONDARY STORAGE 有权
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READING ROWS FROM MEMORY PRIOR TO READING ROWS FROM SECONDARY STORAGE
摘要:
In an embodiment, a first plurality of rows of a first table are read from memory in an order of page addresses of pages in the memory that comprise the first plurality of rows. First selected rows from the first plurality of rows that meet a query predicate are stored into a result set. After the reading the first plurality of rows in the order of the page addresses, a second plurality of rows of the first table are read from secondary storage, in an order of row identifiers of the second plurality of the rows in the first table. Second selected rows from the second plurality of rows that meet the query predicate are stored into the result set.
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