/*

** 2007 May 7

**

** The author disclaims copyright to this source code. In place of

** a legal notice, here is a blessing:

**

** May you do good and not evil.

** May you find forgiveness for yourself and forgive others.

** May you share freely, never taking more than you give.

**

*************************************************************************

**

** This file defines various limits of what SQLite can process.

*/

/*

** The maximum length of a TEXT or BLOB in bytes. This also

** limits the size of a row in a table or index.

**

** The hard limit is the ability of a 32-bit signed integer

** to count the size: 2^31-1 or 2147483647.

*/

#ifndef SQLITE_MAX_LENGTH

# define SQLITE_MAX_LENGTH 1000000000

#endif

/*

** This is the maximum number of

**

** * Columns in a table

** * Columns in an index

** * Columns in a view

** * Terms in the SET clause of an UPDATE statement

** * Terms in the result set of a SELECT statement

** * Terms in the GROUP BY or ORDER BY clauses of a SELECT statement.

** * Terms in the VALUES clause of an INSERT statement

**

** The hard upper limit here is 32676. Most database people will

** tell you that in a well-normalized database, you usually should

** not have more than a dozen or so columns in any table. And if

** that is the case, there is no point in having more than a few

** dozen values in any of the other situations described above.

*/

#ifndef SQLITE_MAX_COLUMN

# define SQLITE_MAX_COLUMN 2000

#endif

/*

** The maximum length of a single SQL statement in bytes.

**

** It used to be the case that setting this value to zero would

** turn the limit off. That is no longer true. It is not possible

** to turn this limit off.

*/

#ifndef SQLITE_MAX_SQL_LENGTH

# define SQLITE_MAX_SQL_LENGTH 1000000000

#endif

/*

** The maximum depth of an expression tree. This is limited to

** some extent by SQLITE_MAX_SQL_LENGTH. But sometime you might

** want to place more severe limits on the complexity of an

** expression. A value of 0 means that there is no limit.

*/

#ifndef SQLITE_MAX_EXPR_DEPTH

# define SQLITE_MAX_EXPR_DEPTH 1000

#endif

/*

** The maximum number of terms in a compound SELECT statement.

** The code generator for compound SELECT statements does one

** level of recursion for each term. A stack overflow can result

** if the number of terms is too large. In practice, most SQL

** never has more than 3 or 4 terms. Use a value of 0 to disable

** any limit on the number of terms in a compound SELECT.

*/

#ifndef SQLITE_MAX_COMPOUND_SELECT

# define SQLITE_MAX_COMPOUND_SELECT 500

#endif

/*

** The maximum number of opcodes in a VDBE program.

** Not currently enforced.

*/

#ifndef SQLITE_MAX_VDBE_OP

# define SQLITE_MAX_VDBE_OP 250000000

#endif

/*

** The maximum number of arguments to an SQL function.

*/

#ifndef SQLITE_MAX_FUNCTION_ARG

# define SQLITE_MAX_FUNCTION_ARG 127

#endif

/*

** The suggested maximum number of in-memory pages to use for

** the main database table and for temporary tables.

**

** IMPLEMENTATION-OF: R-30185-15359 The default suggested cache size is -2000,

** which means the cache size is limited to 2048000 bytes of memory.

** IMPLEMENTATION-OF: R-48205-43578 The default suggested cache size can be

** altered using the SQLITE_DEFAULT_CACHE_SIZE compile-time options.

*/

#ifndef SQLITE_DEFAULT_CACHE_SIZE

# define SQLITE_DEFAULT_CACHE_SIZE -2000

#endif

/*

** The default number of frames to accumulate in the log file before

** checkpointing the database in WAL mode.

*/

#ifndef SQLITE_DEFAULT_WAL_AUTOCHECKPOINT

# define SQLITE_DEFAULT_WAL_AUTOCHECKPOINT 1000

#endif

/*

** The maximum number of attached databases. This must be between 0

** and 125. The upper bound of 125 is because the attached databases are

** counted using a signed 8-bit integer which has a maximum value of 127

** and we have to allow 2 extra counts for the "main" and "temp" databases.

*/

#ifndef SQLITE_MAX_ATTACHED

# define SQLITE_MAX_ATTACHED 10

#endif

/*

** The maximum value of a ?nnn wildcard that the parser will accept.

** If the value exceeds 32767 then extra space is required for the Expr

** structure. But otherwise, we believe that the number can be as large

** as a signed 32-bit integer can hold.

*/

#ifndef SQLITE_MAX_VARIABLE_NUMBER

# define SQLITE_MAX_VARIABLE_NUMBER 32766

#endif

/* Maximum page size. The upper bound on this value is 65536. This a limit

** imposed by the use of 16-bit offsets within each page.

**

** Earlier versions of SQLite allowed the user to change this value at

** compile time. This is no longer permitted, on the grounds that it creates

** a library that is technically incompatible with an SQLite library

** compiled with a different limit. If a process operating on a database

** with a page-size of 65536 bytes crashes, then an instance of SQLite

** compiled with the default page-size limit will not be able to rollback

** the aborted transaction. This could lead to database corruption.

*/

#ifdef SQLITE_MAX_PAGE_SIZE

# undef SQLITE_MAX_PAGE_SIZE

#endif

#define SQLITE_MAX_PAGE_SIZE 65536

/*

** The default size of a database page.

*/

#ifndef SQLITE_DEFAULT_PAGE_SIZE

# define SQLITE_DEFAULT_PAGE_SIZE 4096

#endif

#if SQLITE_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE

# undef SQLITE_DEFAULT_PAGE_SIZE

# define SQLITE_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE

#endif

/*

** Ordinarily, if no value is explicitly provided, SQLite creates databases

** with page size SQLITE_DEFAULT_PAGE_SIZE. However, based on certain

** device characteristics (sector-size and atomic write() support),

** SQLite may choose a larger value. This constant is the maximum value

** SQLite will choose on its own.

*/

#ifndef SQLITE_MAX_DEFAULT_PAGE_SIZE

# define SQLITE_MAX_DEFAULT_PAGE_SIZE 8192

#endif

#if SQLITE_MAX_DEFAULT_PAGE_SIZE>SQLITE_MAX_PAGE_SIZE

# undef SQLITE_MAX_DEFAULT_PAGE_SIZE

# define SQLITE_MAX_DEFAULT_PAGE_SIZE SQLITE_MAX_PAGE_SIZE

#endif

/*

** Maximum number of pages in one database file.

**

** This is really just the default value for the max_page_count pragma.

** This value can be lowered (or raised) at run-time using that the

** max_page_count macro.

*/

#ifndef SQLITE_MAX_PAGE_COUNT

# define SQLITE_MAX_PAGE_COUNT 1073741823

#endif

/*

** Maximum length (in bytes) of the pattern in a LIKE or GLOB

** operator.

*/

#ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH

# define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000

#endif

/*

** Maximum depth of recursion for triggers.

**

** A value of 1 means that a trigger program will not be able to itself

** fire any triggers. A value of 0 means that no trigger programs at all

** may be executed.

*/

#ifndef SQLITE_MAX_TRIGGER_DEPTH

# define SQLITE_MAX_TRIGGER_DEPTH 1000

#endif