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Overview
Comment: | Comment changes in btree.c. No changes to code. (CVS 1988) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
b15abf984fa06ae968d92fa9533dab20 |
User & Date: | drh 2004-09-27 13:19:52.000 |
Context
2004-09-30
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13:43 | Allow functions to be created when there are outstanding VMs. (Ticket #926) Fix problems with sqlite3_errcode(). Add tests for sqlite3_errcode(). (CVS 1989) (check-in: d0f1dc5898 user: drh tags: trunk) | |
2004-09-27
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13:19 | Comment changes in btree.c. No changes to code. (CVS 1988) (check-in: b15abf984f user: drh tags: trunk) | |
12:20 | Bug fix in btree.c in cases where usableSize!=pageSize. Ticket #925. (CVS 1987) (check-in: cb3e12372d user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
1 2 3 4 5 6 7 8 9 10 11 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btree.c,v 1.191 2004/09/27 13:19:52 drh Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** For a detailed discussion of BTrees, refer to ** ** Donald E. Knuth, THE ART OF COMPUTER PROGRAMMING, Volume 3: ** "Sorting And Searching", pages 473-480. Addison-Wesley ** Publishing Company, Reading, Massachusetts. |
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123 124 125 126 127 128 129 | ** 3 2 number of cells on this page ** 5 2 first byte of the cell content area ** 7 1 number of fragmented free bytes ** 8 4 Right child (the Ptr(N+1) value). Omitted on leaves. ** ** The flags define the format of this btree page. The leaf flag means that ** this page has no children. The zerodata flag means that this page carries | | > | | | 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | ** 3 2 number of cells on this page ** 5 2 first byte of the cell content area ** 7 1 number of fragmented free bytes ** 8 4 Right child (the Ptr(N+1) value). Omitted on leaves. ** ** The flags define the format of this btree page. The leaf flag means that ** this page has no children. The zerodata flag means that this page carries ** only keys and no data. The intkey flag means that the key is a integer ** which is stored in the key size entry of the cell header rather than in ** the payload area. ** ** The cell pointer array begins on the first byte after the page header. ** The cell pointer array contains zero or more 2-byte numbers which are ** offsets from the beginning of the page to the cell content in the cell ** content area. The cell pointers occur in sorted order. The system strives ** to keep free space after the last cell pointer so that new cells can ** be easily added without having to defragment the page. ** ** Cell content is stored at the very end of the page and grows toward the ** beginning of the page. ** ** Unused space within the cell content area is collected into a linked list of ** freeblocks. Each freeblock is at least 4 bytes in size. The byte offset ** to the first freeblock is given in the header. Freeblocks occur in |
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