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Overview
| Comment: | Update the documentation for PRAGMA mmap_size to explain that it can sometimes be a no-op. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
a577a4e61897524f894f62aaaff35d22 |
| User & Date: | drh 2013-05-23 11:48:55 |
Context
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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 | |
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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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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.
|
> > > > > > > |
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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.
|