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Overview
Comment: | Update the documentation for PRAGMA mmap_size to explain that it can sometimes be a no-op. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
a577a4e61897524f894f62aaaff35d22 |
User & Date: | drh 2013-05-23 11:48:55.075 |
Context
2013-05-23
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22:56 | Fix a typo in mmap.html. (check-in: 04448addda user: drh tags: trunk) | |
11:48 | Update the documentation for PRAGMA mmap_size to explain that it can sometimes be a no-op. (check-in: a577a4e618 user: drh tags: trunk) | |
2013-05-20
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05:41 | Add the sha1 hash and SQLITE_SOURCE_ID for 3071700 to changes.html. (check-in: e87984f1c8 user: dan tags: trunk) | |
Changes
Changes to pages/pragma.in.
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665 666 667 668 669 670 671 672 673 674 675 676 677 678 | start-time limit has been set.</p> <p>The [PRAGMA mmap_size] statement will never increase the amount of address space used for memory-mapped I/O above the hard limit set by the [SQLITE_MAX_MMAP_SIZE] compile-time option, nor the hard limit set start-time by the second argument to sqlite3_config([SQLITE_CONFIG_MMAP_SIZE])</p> } Pragma page_size { <p>^(<b>PRAGMA page_size; <br>PRAGMA page_size = </b><i>bytes</i><b>;</b></p> <p>Query or set the page size of the database.)^ ^The page size must be a power of two between 512 and 65536 inclusive. | > > > > > > > | 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 | start-time limit has been set.</p> <p>The [PRAGMA mmap_size] statement will never increase the amount of address space used for memory-mapped I/O above the hard limit set by the [SQLITE_MAX_MMAP_SIZE] compile-time option, nor the hard limit set start-time by the second argument to sqlite3_config([SQLITE_CONFIG_MMAP_SIZE])</p> <p>The size of the memory-mapped I/O region cannot be changed while the memory-mapped I/O region is in active use, to avoid unmapping memory out from under running SQL statements. For this reason, the mmap_size pragma may be a no-op if the prior mmap_size is non-zero and there are other SQL statements running concurrently on the same [database connection].</p> } Pragma page_size { <p>^(<b>PRAGMA page_size; <br>PRAGMA page_size = </b><i>bytes</i><b>;</b></p> <p>Query or set the page size of the database.)^ ^The page size must be a power of two between 512 and 65536 inclusive. |
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