f78ceafdce
used new shared cache functionality (yay) --HG-- extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%401651
170 lines
4.9 KiB
C
170 lines
4.9 KiB
C
/*
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** 2007 May 7
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This file defines various limits of what SQLite can process.
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**
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** @(#) $Id$
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*/
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/*
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** The maximum length of a TEXT or BLOB in bytes. This also
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** limits the size of a row in a table or index.
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**
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** The hard limit is the ability of a 32-bit signed integer
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** to count the size: 2^31-1 or 2147483647.
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*/
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#ifndef SQLITE_MAX_LENGTH
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# define SQLITE_MAX_LENGTH 1000000000
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#endif
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/*
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** This is the maximum number of
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**
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** * Columns in a table
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** * Columns in an index
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** * Columns in a view
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** * Terms in the SET clause of an UPDATE statement
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** * Terms in the result set of a SELECT statement
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** * Terms in the GROUP BY or ORDER BY clauses of a SELECT statement.
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** * Terms in the VALUES clause of an INSERT statement
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**
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** The hard upper limit here is 32676. Most database people will
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** tell you that in a well-normalized database, you usually should
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** not have more than a dozen or so columns in any table. And if
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** that is the case, there is no point in having more than a few
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** dozen values in any of the other situations described above.
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*/
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#ifndef SQLITE_MAX_COLUMN
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# define SQLITE_MAX_COLUMN 2000
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#endif
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/*
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** The maximum length of a single SQL statement in bytes.
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** The hard limit here is the same as SQLITE_MAX_LENGTH.
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*/
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#ifndef SQLITE_MAX_SQL_LENGTH
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# define SQLITE_MAX_SQL_LENGTH 1000000
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#endif
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/*
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** The maximum depth of an expression tree. This is limited to
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** some extent by SQLITE_MAX_SQL_LENGTH. But sometime you might
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** want to place more severe limits on the complexity of an
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** expression. A value of 0 (the default) means do not enforce
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** any limitation on expression tree depth.
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*/
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#ifndef SQLITE_MAX_EXPR_DEPTH
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# define SQLITE_MAX_EXPR_DEPTH 1000
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#endif
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/*
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** The maximum number of terms in a compound SELECT statement.
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** The code generator for compound SELECT statements does one
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** level of recursion for each term. A stack overflow can result
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** if the number of terms is too large. In practice, most SQL
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** never has more than 3 or 4 terms. Use a value of 0 to disable
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** any limit on the number of terms in a compount SELECT.
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*/
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#ifndef SQLITE_MAX_COMPOUND_SELECT
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# define SQLITE_MAX_COMPOUND_SELECT 500
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#endif
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/*
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** The maximum number of opcodes in a VDBE program.
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** Not currently enforced.
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*/
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#ifndef SQLITE_MAX_VDBE_OP
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# define SQLITE_MAX_VDBE_OP 25000
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#endif
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/*
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** The maximum number of arguments to an SQL function.
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*/
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#ifndef SQLITE_MAX_FUNCTION_ARG
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# define SQLITE_MAX_FUNCTION_ARG 100
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#endif
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/*
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** The maximum number of in-memory pages to use for the main database
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** table and for temporary tables. The SQLITE_DEFAULT_CACHE_SIZE
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*/
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#ifndef SQLITE_DEFAULT_CACHE_SIZE
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# define SQLITE_DEFAULT_CACHE_SIZE 2000
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#endif
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#ifndef SQLITE_DEFAULT_TEMP_CACHE_SIZE
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# define SQLITE_DEFAULT_TEMP_CACHE_SIZE 500
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#endif
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/*
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** The maximum number of attached databases. This must be at least 2
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** in order to support the main database file (0) and the file used to
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** hold temporary tables (1). And it must be less than 32 because
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** we use a bitmask of databases with a u32 in places (for example
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** the Parse.cookieMask field).
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*/
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#ifndef SQLITE_MAX_ATTACHED
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# define SQLITE_MAX_ATTACHED 10
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#endif
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/*
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** The maximum value of a ?nnn wildcard that the parser will accept.
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*/
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#ifndef SQLITE_MAX_VARIABLE_NUMBER
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# define SQLITE_MAX_VARIABLE_NUMBER 999
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#endif
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/*
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** The default size of a database page.
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*/
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#ifndef SQLITE_DEFAULT_PAGE_SIZE
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# define SQLITE_DEFAULT_PAGE_SIZE 1024
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#endif
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/*
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** Ordinarily, if no value is explicitly provided, SQLite creates databases
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** with page size SQLITE_DEFAULT_PAGE_SIZE. However, based on certain
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** device characteristics (sector-size and atomic write() support),
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** SQLite may choose a larger value. This constant is the maximum value
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** SQLite will choose on it's own.
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*/
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#ifndef SQLITE_MAX_DEFAULT_PAGE_SIZE
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# define SQLITE_MAX_DEFAULT_PAGE_SIZE 8192
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#endif
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/* Maximum page size. The upper bound on this value is 32768. This a limit
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** imposed by the necessity of storing the value in a 2-byte unsigned integer
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** and the fact that the page size must be a power of 2.
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*/
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#ifndef SQLITE_MAX_PAGE_SIZE
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# define SQLITE_MAX_PAGE_SIZE 32768
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#endif
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/*
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** Maximum number of pages in one database file.
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**
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** This is really just the default value for the max_page_count pragma.
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** This value can be lowered (or raised) at run-time using that the
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** max_page_count macro.
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*/
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#ifndef SQLITE_MAX_PAGE_COUNT
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# define SQLITE_MAX_PAGE_COUNT 1073741823
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#endif
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/*
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** Maximum length (in bytes) of the pattern in a LIKE or GLOB
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** operator.
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*/
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#ifndef SQLITE_MAX_LIKE_PATTERN_LENGTH
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# define SQLITE_MAX_LIKE_PATTERN_LENGTH 50000
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#endif
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