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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Configuration Options</h2><blockquote><pre>#define SQLITE_CONFIG_SINGLETHREAD 1 /* nil */
#define SQLITE_CONFIG_MULTITHREAD 2 /* nil */
#define SQLITE_CONFIG_SERIALIZED 3 /* nil */
#define SQLITE_CONFIG_MALLOC 4 /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_GETMALLOC 5 /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_SCRATCH 6 /* void*, int sz, int N */
#define SQLITE_CONFIG_PAGECACHE 7 /* void*, int sz, int N */
#define SQLITE_CONFIG_HEAP 8 /* void*, int nByte, int min */
#define SQLITE_CONFIG_MEMSTATUS 9 /* boolean */
#define SQLITE_CONFIG_MUTEX 10 /* sqlite3_mutex_methods* */
#define SQLITE_CONFIG_GETMUTEX 11 /* sqlite3_mutex_methods* */
/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */
#define SQLITE_CONFIG_LOOKASIDE 13 /* int int */
#define SQLITE_CONFIG_PCACHE 14 /* no-op */
#define SQLITE_CONFIG_GETPCACHE 15 /* no-op */
#define SQLITE_CONFIG_LOG 16 /* xFunc, void* */
#define SQLITE_CONFIG_URI 17 /* int */
#define SQLITE_CONFIG_PCACHE2 18 /* sqlite3_pcache_methods2* */
#define SQLITE_CONFIG_GETPCACHE2 19 /* sqlite3_pcache_methods2* */
#define SQLITE_CONFIG_COVERING_INDEX_SCAN 20 /* int */
#define SQLITE_CONFIG_SQLLOG 21 /* xSqllog, void* */
#define SQLITE_CONFIG_MMAP_SIZE 22 /* sqlite3_int64, sqlite3_int64 */
#define SQLITE_CONFIG_WIN32_HEAPSIZE 23 /* int nByte */
</pre></blockquote><p>
These constants are the available integer configuration options that
can be passed as the first argument to the <a href="../c3ref/config.html">sqlite3_config()</a> interface.</p>
<p>New configuration options may be added in future releases of SQLite.
Existing configuration options might be discontinued. Applications
should check the return code from <a href="../c3ref/config.html">sqlite3_config()</a> to make sure that
the call worked. The <a href="../c3ref/config.html">sqlite3_config()</a> interface will return a
non-zero <a href="../rescode.html">error code</a> if a discontinued or unsupported configuration option
is invoked.</p>
<p><dl>
<a name="sqliteconfigsinglethread"></a>
<dt>SQLITE_CONFIG_SINGLETHREAD</dt>
<dd>There are no arguments to this option. This option sets the
<a href="../threadsafe.html">threading mode</a> to Single-thread. In other words, it disables
all mutexing and puts SQLite into a mode where it can only be used
by a single thread. If SQLite is compiled with
the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE=0</a> compile-time option then
it is not possible to change the <a href="../threadsafe.html">threading mode</a> from its default
value of Single-thread and so <a href="../c3ref/config.html">sqlite3_config()</a> will return
<a href="../rescode.html#error">SQLITE_ERROR</a> if called with the SQLITE_CONFIG_SINGLETHREAD
configuration option.</dd></p>
<p><a name="sqliteconfigmultithread"></a>
<dt>SQLITE_CONFIG_MULTITHREAD</dt>
<dd>There are no arguments to this option. This option sets the
<a href="../threadsafe.html">threading mode</a> to Multi-thread. In other words, it disables
mutexing on <a href="../c3ref/sqlite3.html">database connection</a> and <a href="../c3ref/stmt.html">prepared statement</a> objects.
The application is responsible for serializing access to
<a href="../c3ref/sqlite3.html">database connections</a> and <a href="../c3ref/stmt.html">prepared statements</a>. But other mutexes
are enabled so that SQLite will be safe to use in a multi-threaded
environment as long as no two threads attempt to use the same
<a href="../c3ref/sqlite3.html">database connection</a> at the same time. If SQLite is compiled with
the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE=0</a> compile-time option then
it is not possible to set the Multi-thread <a href="../threadsafe.html">threading mode</a> and
<a href="../c3ref/config.html">sqlite3_config()</a> will return <a href="../rescode.html#error">SQLITE_ERROR</a> if called with the
SQLITE_CONFIG_MULTITHREAD configuration option.</dd></p>
<p><a name="sqliteconfigserialized"></a>
<dt>SQLITE_CONFIG_SERIALIZED</dt>
<dd>There are no arguments to this option. This option sets the
<a href="../threadsafe.html">threading mode</a> to Serialized. In other words, this option enables
all mutexes including the recursive
mutexes on <a href="../c3ref/sqlite3.html">database connection</a> and <a href="../c3ref/stmt.html">prepared statement</a> objects.
In this mode (which is the default when SQLite is compiled with
<a href="../compile.html#threadsafe">SQLITE_THREADSAFE=1</a>) the SQLite library will itself serialize access
to <a href="../c3ref/sqlite3.html">database connections</a> and <a href="../c3ref/stmt.html">prepared statements</a> so that the
application is free to use the same <a href="../c3ref/sqlite3.html">database connection</a> or the
same <a href="../c3ref/stmt.html">prepared statement</a> in different threads at the same time.
If SQLite is compiled with
the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE=0</a> compile-time option then
it is not possible to set the Serialized <a href="../threadsafe.html">threading mode</a> and
<a href="../c3ref/config.html">sqlite3_config()</a> will return <a href="../rescode.html#error">SQLITE_ERROR</a> if called with the
SQLITE_CONFIG_SERIALIZED configuration option.</dd></p>
<p><a name="sqliteconfigmalloc"></a>
<dt>SQLITE_CONFIG_MALLOC</dt>
<dd> This option takes a single argument which is a pointer to an
instance of the <a href="../c3ref/mem_methods.html">sqlite3_mem_methods</a> structure. The argument specifies
alternative low-level memory allocation routines to be used in place of
the memory allocation routines built into SQLite. SQLite makes
its own private copy of the content of the <a href="../c3ref/mem_methods.html">sqlite3_mem_methods</a> structure
before the <a href="../c3ref/config.html">sqlite3_config()</a> call returns.</dd></p>
<p><a name="sqliteconfiggetmalloc"></a>
<dt>SQLITE_CONFIG_GETMALLOC</dt>
<dd> This option takes a single argument which is a pointer to an
instance of the <a href="../c3ref/mem_methods.html">sqlite3_mem_methods</a> structure. The <a href="../c3ref/mem_methods.html">sqlite3_mem_methods</a>
structure is filled with the currently defined memory allocation routines.
This option can be used to overload the default memory allocation
routines with a wrapper that simulations memory allocation failure or
tracks memory usage, for example. </dd></p>
<p><a name="sqliteconfigmemstatus"></a>
<dt>SQLITE_CONFIG_MEMSTATUS</dt>
<dd> This option takes single argument of type int, interpreted as a
boolean, which enables or disables the collection of memory allocation
statistics. When memory allocation statistics are disabled, the
following SQLite interfaces become non-operational:
<ul>
<li> <a href="../c3ref/memory_highwater.html">sqlite3_memory_used()</a>
<li> <a href="../c3ref/memory_highwater.html">sqlite3_memory_highwater()</a>
<li> <a href="../c3ref/soft_heap_limit64.html">sqlite3_soft_heap_limit64()</a>
<li> <a href="../c3ref/status.html">sqlite3_status()</a>
</ul>
Memory allocation statistics are enabled by default unless SQLite is
compiled with <a href="../compile.html#default_memstatus">SQLITE_DEFAULT_MEMSTATUS</a>=0 in which case memory
allocation statistics are disabled by default.
</dd></p>
<p><a name="sqliteconfigscratch"></a>
<dt>SQLITE_CONFIG_SCRATCH</dt>
<dd> This option specifies a static memory buffer that SQLite can use for
scratch memory. There are three arguments: A pointer an 8-byte
aligned memory buffer from which the scratch allocations will be
drawn, the size of each scratch allocation (sz),
and the maximum number of scratch allocations (N). The sz
argument must be a multiple of 16.
The first argument must be a pointer to an 8-byte aligned buffer
of at least sz*N bytes of memory.
SQLite will use no more than two scratch buffers per thread. So
N should be set to twice the expected maximum number of threads.
SQLite will never require a scratch buffer that is more than 6
times the database page size. If SQLite needs needs additional
scratch memory beyond what is provided by this configuration option, then
<a href="../c3ref/free.html">sqlite3_malloc()</a> will be used to obtain the memory needed.</dd></p>
<p><a name="sqliteconfigpagecache"></a>
<dt>SQLITE_CONFIG_PAGECACHE</dt>
<dd> This option specifies a static memory buffer that SQLite can use for
the database page cache with the default page cache implementation.
This configuration should not be used if an application-define page
cache implementation is loaded using the SQLITE_CONFIG_PCACHE2 option.
There are three arguments to this option: A pointer to 8-byte aligned
memory, the size of each page buffer (sz), and the number of pages (N).
The sz argument should be the size of the largest database page
(a power of two between 512 and 32768) plus a little extra for each
page header. The page header size is 20 to 40 bytes depending on
the host architecture. It is harmless, apart from the wasted memory,
to make sz a little too large. The first
argument should point to an allocation of at least sz*N bytes of memory.
SQLite will use the memory provided by the first argument to satisfy its
memory needs for the first N pages that it adds to cache. If additional
page cache memory is needed beyond what is provided by this option, then
SQLite goes to <a href="../c3ref/free.html">sqlite3_malloc()</a> for the additional storage space.
The pointer in the first argument must
be aligned to an 8-byte boundary or subsequent behavior of SQLite
will be undefined.</dd></p>
<p><a name="sqliteconfigheap"></a>
<dt>SQLITE_CONFIG_HEAP</dt>
<dd> This option specifies a static memory buffer that SQLite will use
for all of its dynamic memory allocation needs beyond those provided
for by <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigscratch">SQLITE_CONFIG_SCRATCH</a> and <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigpagecache">SQLITE_CONFIG_PAGECACHE</a>.
There are three arguments: An 8-byte aligned pointer to the memory,
the number of bytes in the memory buffer, and the minimum allocation size.
If the first pointer (the memory pointer) is NULL, then SQLite reverts
to using its default memory allocator (the system malloc() implementation),
undoing any prior invocation of <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigmalloc">SQLITE_CONFIG_MALLOC</a>. If the
memory pointer is not NULL and either <a href="../compile.html#enable_memsys3">SQLITE_ENABLE_MEMSYS3</a> or
<a href="../compile.html#enable_memsys5">SQLITE_ENABLE_MEMSYS5</a> are defined, then the alternative memory
allocator is engaged to handle all of SQLites memory allocation needs.
The first pointer (the memory pointer) must be aligned to an 8-byte
boundary or subsequent behavior of SQLite will be undefined.
The minimum allocation size is capped at 2**12. Reasonable values
for the minimum allocation size are 2**5 through 2**8.</dd></p>
<p><a name="sqliteconfigmutex"></a>
<dt>SQLITE_CONFIG_MUTEX</dt>
<dd> This option takes a single argument which is a pointer to an
instance of the <a href="../c3ref/mutex_methods.html">sqlite3_mutex_methods</a> structure. The argument specifies
alternative low-level mutex routines to be used in place
the mutex routines built into SQLite. SQLite makes a copy of the
content of the <a href="../c3ref/mutex_methods.html">sqlite3_mutex_methods</a> structure before the call to
<a href="../c3ref/config.html">sqlite3_config()</a> returns. If SQLite is compiled with
the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE=0</a> compile-time option then
the entire mutexing subsystem is omitted from the build and hence calls to
<a href="../c3ref/config.html">sqlite3_config()</a> with the SQLITE_CONFIG_MUTEX configuration option will
return <a href="../rescode.html#error">SQLITE_ERROR</a>.</dd></p>
<p><a name="sqliteconfiggetmutex"></a>
<dt>SQLITE_CONFIG_GETMUTEX</dt>
<dd> This option takes a single argument which is a pointer to an
instance of the <a href="../c3ref/mutex_methods.html">sqlite3_mutex_methods</a> structure. The
<a href="../c3ref/mutex_methods.html">sqlite3_mutex_methods</a>
structure is filled with the currently defined mutex routines.
This option can be used to overload the default mutex allocation
routines with a wrapper used to track mutex usage for performance
profiling or testing, for example. If SQLite is compiled with
the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE=0</a> compile-time option then
the entire mutexing subsystem is omitted from the build and hence calls to
<a href="../c3ref/config.html">sqlite3_config()</a> with the SQLITE_CONFIG_GETMUTEX configuration option will
return <a href="../rescode.html#error">SQLITE_ERROR</a>.</dd></p>
<p><a name="sqliteconfiglookaside"></a>
<dt>SQLITE_CONFIG_LOOKASIDE</dt>
<dd> This option takes two arguments that determine the default
memory allocation for the lookaside memory allocator on each
<a href="../c3ref/sqlite3.html">database connection</a>. The first argument is the
size of each lookaside buffer slot and the second is the number of
slots allocated to each database connection. This option sets the
<i>default</i> lookaside size. The <a href="../c3ref/c_dbconfig_enable_fkey.html">SQLITE_DBCONFIG_LOOKASIDE</a>
verb to <a href="../c3ref/db_config.html">sqlite3_db_config()</a> can be used to change the lookaside
configuration on individual connections. </dd></p>
<p><a name="sqliteconfigpcache2"></a>
<dt>SQLITE_CONFIG_PCACHE2</dt>
<dd> This option takes a single argument which is a pointer to
an <a href="../c3ref/pcache_methods2.html">sqlite3_pcache_methods2</a> object. This object specifies the interface
to a custom page cache implementation. SQLite makes a copy of the
object and uses it for page cache memory allocations.</dd></p>
<p><a name="sqliteconfiggetpcache2"></a>
<dt>SQLITE_CONFIG_GETPCACHE2</dt>
<dd> This option takes a single argument which is a pointer to an
<a href="../c3ref/pcache_methods2.html">sqlite3_pcache_methods2</a> object. SQLite copies of the current
page cache implementation into that object. </dd></p>
<p><a name="sqliteconfiglog"></a>
<dt>SQLITE_CONFIG_LOG</dt>
<dd> The SQLITE_CONFIG_LOG option is used to configure the SQLite
global <a href="../errlog.html">error log</a>.
(The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
function with a call signature of void(*)(void*,int,const char*),
and a pointer to void. If the function pointer is not NULL, it is
invoked by <a href="../c3ref/log.html">sqlite3_log()</a> to process each logging event. If the
function pointer is NULL, the <a href="../c3ref/log.html">sqlite3_log()</a> interface becomes a no-op.
The void pointer that is the second argument to SQLITE_CONFIG_LOG is
passed through as the first parameter to the application-defined logger
function whenever that function is invoked. The second parameter to
the logger function is a copy of the first parameter to the corresponding
<a href="../c3ref/log.html">sqlite3_log()</a> call and is intended to be a <a href="../rescode.html">result code</a> or an
<a href="../rescode.html#extrc">extended result code</a>. The third parameter passed to the logger is
log message after formatting via <a href="../c3ref/mprintf.html">sqlite3_snprintf()</a>.
The SQLite logging interface is not reentrant; the logger function
supplied by the application must not invoke any SQLite interface.
In a multi-threaded application, the application-defined logger
function must be threadsafe. </dd></p>
<p><a name="sqliteconfiguri"></a>
<dt>SQLITE_CONFIG_URI
<dd>This option takes a single argument of type int. If non-zero, then
URI handling is globally enabled. If the parameter is zero, then URI handling
is globally disabled. If URI handling is globally enabled, all filenames
passed to <a href="../c3ref/open.html">sqlite3_open()</a>, <a href="../c3ref/open.html">sqlite3_open_v2()</a>, <a href="../c3ref/open.html">sqlite3_open16()</a> or
specified as part of <a href="../lang_attach.html">ATTACH</a> commands are interpreted as URIs, regardless
of whether or not the <a href="../c3ref/c_open_autoproxy.html">SQLITE_OPEN_URI</a> flag is set when the database
connection is opened. If it is globally disabled, filenames are
only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
database connection is opened. By default, URI handling is globally
disabled. The default value may be changed by compiling with the
<a href="../compile.html#use_uri">SQLITE_USE_URI</a> symbol defined.</p>
<p><a name="sqliteconfigcoveringindexscan"></a>
<dt>SQLITE_CONFIG_COVERING_INDEX_SCAN
<dd>This option takes a single integer argument which is interpreted as
a boolean in order to enable or disable the use of covering indices for
full table scans in the query optimizer. The default setting is determined
by the <a href="../compile.html#allow_covering_index_scan">SQLITE_ALLOW_COVERING_INDEX_SCAN</a> compile-time option, or is "on"
if that compile-time option is omitted.
The ability to disable the use of covering indices for full table scans
is because some incorrectly coded legacy applications might malfunction
when the optimization is enabled. Providing the ability to
disable the optimization allows the older, buggy application code to work
without change even with newer versions of SQLite.</p>
<p><a name="sqliteconfigpcache"></a>
<a name="sqliteconfiggetpcache"></a>
<dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFIG_GETPCACHE
<dd> These options are obsolete and should not be used by new code.
They are retained for backwards compatibility but are now no-ops.
</dd></p>
<p><a name="sqliteconfigsqllog"></a>
<dt>SQLITE_CONFIG_SQLLOG
<dd>This option is only available if sqlite is compiled with the
<a href="../compile.html#enable_sqllog">SQLITE_ENABLE_SQLLOG</a> pre-processor macro defined. The first argument should
be a pointer to a function of type void(*)(void*,sqlite3*,const char*, int).
The second should be of type (void*). The callback is invoked by the library
in three separate circumstances, identified by the value passed as the
fourth parameter. If the fourth parameter is 0, then the database connection
passed as the second argument has just been opened. The third argument
points to a buffer containing the name of the main database file. If the
fourth parameter is 1, then the SQL statement that the third parameter
points to has just been executed. Or, if the fourth parameter is 2, then
the connection being passed as the second parameter is being closed. The
third parameter is passed NULL In this case. An example of using this
configuration option can be seen in the "test_sqllog.c" source file in
the canonical SQLite source tree.</dd></p>
<p><a name="sqliteconfigmmapsize"></a>
<dt>SQLITE_CONFIG_MMAP_SIZE
<dd>SQLITE_CONFIG_MMAP_SIZE takes two 64-bit integer (sqlite3_int64) values
that are the default mmap size limit (the default setting for
<a href="../pragma.html#pragma_mmap_size">PRAGMA mmap_size</a>) and the maximum allowed mmap size limit.
The default setting can be overridden by each database connection using
either the <a href="../pragma.html#pragma_mmap_size">PRAGMA mmap_size</a> command, or by using the
<a href="../c3ref/c_fcntl_busyhandler.html#sqlitefcntlmmapsize">SQLITE_FCNTL_MMAP_SIZE</a> file control. The maximum allowed mmap size
cannot be changed at run-time. Nor may the maximum allowed mmap size
exceed the compile-time maximum mmap size set by the
<a href="../compile.html#max_mmap_size">SQLITE_MAX_MMAP_SIZE</a> compile-time option.
If either argument to this option is negative, then that argument is
changed to its compile-time default.</p>
<p><a name="sqliteconfigwin32heapsize"></a>
<dt>SQLITE_CONFIG_WIN32_HEAPSIZE
<dd>This option is only available if SQLite is compiled for Windows
with the <a href="../compile.html#win32_malloc">SQLITE_WIN32_MALLOC</a> pre-processor macro defined.
SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit unsigned integer value
that specifies the maximum size of the created heap.
</dl>
</p><p>See also lists of
<a href="objlist.html">Objects</a>,
<a href="constlist.html">Constants</a>, and
<a href="funclist.html">Functions</a>.</p>
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