131 lines
4.8 KiB
HTML
131 lines
4.8 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link href="../sqlite.css" rel="stylesheet">
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<title>Synchronization Type Flags</title>
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</head>
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<body>
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</div>
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<!-- keywords: SQLITE_SYNC_DATAONLY SQLITE_SYNC_FULL SQLITE_SYNC_NORMAL -->
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<div class=nosearch>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Synchronization Type Flags</h2>
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</div>
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<blockquote><pre>
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#define SQLITE_SYNC_NORMAL 0x00002
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#define SQLITE_SYNC_FULL 0x00003
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#define SQLITE_SYNC_DATAONLY 0x00010
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</pre></blockquote>
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<p>
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When SQLite invokes the xSync() method of an
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<a href="../c3ref/io_methods.html">sqlite3_io_methods</a> object it uses a combination of
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these integer values as the second argument.</p>
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<p>When the SQLITE_SYNC_DATAONLY flag is used, it means that the
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sync operation only needs to flush data to mass storage. Inode
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information need not be flushed. If the lower four bits of the flag
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equal SQLITE_SYNC_NORMAL, that means to use normal fsync() semantics.
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If the lower four bits equal SQLITE_SYNC_FULL, that means
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to use Mac OS X style fullsync instead of fsync().</p>
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<p>Do not confuse the SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags
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with the <a href="../pragma.html#pragma_synchronous">PRAGMA synchronous</a>=NORMAL and <a href="../pragma.html#pragma_synchronous">PRAGMA synchronous</a>=FULL
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settings. The <a href="../pragma.html#pragma_synchronous">synchronous pragma</a> determines when calls to the
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xSync VFS method occur and applies uniformly across all platforms.
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The SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags determine how
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energetic or rigorous or forceful the sync operations are and
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only make a difference on Mac OSX for the default SQLite code.
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(Third-party VFS implementations might also make the distinction
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between SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL, but among the
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operating systems natively supported by SQLite, only Mac OSX
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cares about the difference.)
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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