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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Device Characteristics</h2><blockquote><pre>#define SQLITE_IOCAP_ATOMIC 0x00000001
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#define SQLITE_IOCAP_ATOMIC512 0x00000002
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#define SQLITE_IOCAP_ATOMIC1K 0x00000004
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#define SQLITE_IOCAP_ATOMIC2K 0x00000008
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#define SQLITE_IOCAP_ATOMIC4K 0x00000010
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#define SQLITE_IOCAP_ATOMIC8K 0x00000020
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#define SQLITE_IOCAP_ATOMIC16K 0x00000040
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#define SQLITE_IOCAP_ATOMIC32K 0x00000080
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#define SQLITE_IOCAP_ATOMIC64K 0x00000100
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#define SQLITE_IOCAP_SAFE_APPEND 0x00000200
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#define SQLITE_IOCAP_SEQUENTIAL 0x00000400
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#define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN 0x00000800
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#define SQLITE_IOCAP_POWERSAFE_OVERWRITE 0x00001000
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</pre></blockquote><p>
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The xDeviceCharacteristics method of the <a href="../c3ref/io_methods.html">sqlite3_io_methods</a>
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object returns an integer which is a vector of the these
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bit values expressing I/O characteristics of the mass storage
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device that holds the file that the <a href="../c3ref/io_methods.html">sqlite3_io_methods</a>
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<p>The SQLITE_IOCAP_ATOMIC property means that all writes of
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any size are atomic. The SQLITE_IOCAP_ATOMICnnn values
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mean that writes of blocks that are nnn bytes in size and
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are aligned to an address which is an integer multiple of
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nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means
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that when data is appended to a file, the data is appended
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first then the size of the file is extended, never the other
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way around. The SQLITE_IOCAP_SEQUENTIAL property means that
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information is written to disk in the same order as calls
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to xWrite(). The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that
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after reboot following a crash or power loss, the only bytes in a
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file that were written at the application level might have changed
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and that adjacent bytes, even bytes within the same sector are
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guaranteed to be unchanged.
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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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