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3 It carries out pointer swizzling out on page Pi , as described earlier in Swizzling Pointer on a Page 4 After swizzling all persistent pointers in P , the system allows the pointer dereference that resulted in the segmentation violation to continue The pointer dereference will nd the object for which it was looking loaded in memory If any swizzled pointer that points to an object in page vi is dereferenced later, the dereference proceeds just like any other virtual-memory access, with no extra overheads In contrast, if swizzling is not used, there is considerable overhead in locating the buffer page containing the object and then accessing it This overhead has to be incurred on every access to objects in the page, whereas when swizzling is performed, the overhead is incurred only on the rst access to an object in the page Later accesses operate at regular virtual-memory access speeds Hardware swizzling thus gives excellent performance bene ts to applications that repeatedly dereference pointers
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Software swizzling performs a deswizzling operation when a page in memory has to be written back to the database, to convert in-memory pointers back to persistent pointers Hardware swizzling can avoid this step when the system does pointer swizzling for the page, it simply updates the translation table for the page, so that the page-identi er part of the swizzled in-memory pointers can be used to look up the table For example, as shown in Figure 1123, database page 67934278 (with short identi er 2395 in the page shown) is mapped to virtual-memory page 5001 At this point, not only is the pointer in object 1 updated from 2395255 to 5001255, but also the short identi er in the table is updated to 5001 Thus, the short identi er 5001 in object 1 and in the table match each other again Therefore, the page can be written back to disk without any deswizzling Several optimizations can be carried out on the basic scheme described here When the system swizzles page P , for each page P referred to by any persistent pointer in P , it attempts to allocate P to the virtual address location indicated by the short page identi er of P on page P If the system can allocate the page in this attempt, pointers to it do not need to be updated In our swizzling example, page 51956850 with short page identi er 4867 was mapped to virtual-memory page 4867, which is the same as its short page identi er We can see that the pointer in object 2 to this page did not need to be changed during swizzling If every page can be allocated to its appropriate location in virtual address space, none of the pointers need to be translated, and the cost of swizzling is reduced signi cantly Hardware swizzling works even if the database is bigger than virtual memory, but only as long as all the pages that a particular process accesses t into the virtual memory of the process If they do not, a page that has been brought into virtual memory will have to be replaced, and that replacement is hard to do, since there may be in-memory pointers to objects in that page
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11
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Hardware swizzling can also be used at the level of sets of pages (often called segments), instead of for a single page For set-level swizzling, the system uses a single translation table for all pages in the segment It loads pages in the segment and swizzles them as and when they are required; they need not be loaded all together
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