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Overview
Comment: | Use > instead of > in documentation. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
4607eaf52f87231c1a2ae408f586533e |
User & Date: | drh 2016-05-09 23:12:17.034 |
Context
2016-05-16
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15:41 | Clarify wording in cintro.html. (check-in: b9557433b1 user: drh tags: trunk) | |
2016-05-09
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23:12 | Use > instead of > in documentation. (check-in: 4607eaf52f user: drh tags: trunk) | |
20:14 | Fix a typo in the change log. (check-in: 5100e74a66 user: drh tags: trunk) | |
Changes
Changes to pages/fileformat2.in.
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785 786 787 788 789 790 791 | <ul> <li>X is U-35 for table btree leaf pages or ((U-12)*64/255)-23 for index pages. <li>M is always ((U-12)*32/255)-23. <li>Let K be M+((P-M)%(U-4)). <li>^If P<=X then all P bytes of payload are stored directly on the btree page without overflow. | | | | 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 | <ul> <li>X is U-35 for table btree leaf pages or ((U-12)*64/255)-23 for index pages. <li>M is always ((U-12)*32/255)-23. <li>Let K be M+((P-M)%(U-4)). <li>^If P<=X then all P bytes of payload are stored directly on the btree page without overflow. <li>^If P>X and K<=X then the first K bytes of P are stored on the btree page and the remaining P-K bytes are stored on overflow pages. <li>^If P>X and K>X then the first M bytes of P are stored on the btree page and the remaining P-M bytes are stored on overflow pages. </ul> <p>The overflow thresholds are designed to give a minimum fanout of 4 for index b-trees and to make sure enough of the payload is on the b-tree page that the record header can usually be accessed without consulting an overflow page. In hindsight, the designers of |
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