/*------------------------------------------------------------------------ * PostgreSQL manual configuration settings * * This file contains various configuration symbols and limits. In * all cases, changing them is only useful in very rare situations or * for developers. If you edit any of these, be sure to do a *full* * rebuild (and an initdb if noted). * * $Id: pg_config_manual.h,v 1.1 2003/04/06 22:45:23 petere Exp $ *------------------------------------------------------------------------ */ /* * Size of a disk block --- this also limits the size of a tuple. You * can set it bigger if you need bigger tuples (although TOAST should * reduce the need to have large tuples, since fields can be spread * across multiple tuples). * * BLCKSZ must be a power of 2. The maximum possible value of BLCKSZ * is currently 2^15 (32768). This is determined by the 15-bit widths * of the lp_off and lp_len fields in ItemIdData (see * include/storage/itemid.h). * * Changing BLCKSZ requires an initdb. */ #define BLCKSZ 8192 /* * RELSEG_SIZE is the maximum number of blocks allowed in one disk * file. Thus, the maximum size of a single file is RELSEG_SIZE * * BLCKSZ; relations bigger than that are divided into multiple files. * * RELSEG_SIZE * BLCKSZ must be less than your OS' limit on file size. * This is often 2 GB or 4GB in a 32-bit operating system, unless you * have large file support enabled. By default, we make the limit 1 * GB to avoid any possible integer-overflow problems within the OS. * A limit smaller than necessary only means we divide a large * relation into more chunks than necessary, so it seems best to err * in the direction of a small limit. (Besides, a power-of-2 value * saves a few cycles in md.c.) * * Changing RELSEG_SIZE requires an initdb. */ #define RELSEG_SIZE (0x40000000 / BLCKSZ) /* * Maximum number of columns in an index and maximum number of * arguments to a function. They must be the same value. * * The minimum value is 8 (index creation uses 8-argument functions). * There is no specific upper limit, although large values will waste * system-table space and processing time. * * Changing these requires an initdb. */ #define INDEX_MAX_KEYS 32 #define FUNC_MAX_ARGS INDEX_MAX_KEYS /* * Define this to make libpgtcl's "pg_result -assign" command process * C-style backslash sequences in returned tuple data and convert * PostgreSQL array values into Tcl lists. CAUTION: This conversion * is *wrong* unless you install the routines in * contrib/string/string_io to make the server produce C-style * backslash sequences in the first place. */ /* #define TCL_ARRAYS */ /* * User locks are handled totally on the application side as long term * cooperative locks which extend beyond the normal transaction * boundaries. Their purpose is to indicate to an application that * someone is `working' on an item. Define this flag to enable user * locks. You will need the loadable module user-locks.c to use this * feature. */ #define USER_LOCKS /* * Define this if you want psql to _always_ ask for a username and a * password for password authentication. */ /* #define PSQL_ALWAYS_GET_PASSWORDS */ /* * Define this if you want to allow the lo_import and lo_export SQL * functions to be executed by ordinary users. By default these * functions are only available to the Postgres superuser. CAUTION: * These functions are SECURITY HOLES since they can read and write * any file that the PostgreSQL server has permission to access. If * you turn this on, don't say we didn't warn you. */ /* #define ALLOW_DANGEROUS_LO_FUNCTIONS */ /* * MAXPGPATH: standard size of a pathname buffer in PostgreSQL (hence, * maximum usable pathname length is one less). * * We'd use a standard system header symbol for this, if there weren't * so many to choose from: MAXPATHLEN, MAX_PATH, PATH_MAX are all * defined by different "standards", and often have different values * on the same platform! So we just punt and use a reasonably * generous setting here. */ #define MAXPGPATH 1024 /* * DEFAULT_MAX_EXPR_DEPTH: default value of max_expr_depth SET variable. */ #define DEFAULT_MAX_EXPR_DEPTH 10000 /* * PG_SOMAXCONN: maximum accept-queue length limit passed to * listen(2). You'd think we should use SOMAXCONN from * , but on many systems that symbol is much smaller * than the kernel's actual limit. In any case, this symbol need be * twiddled only if you have a kernel that refuses large limit values, * rather than silently reducing the value to what it can handle * (which is what most if not all Unixen do). */ #define PG_SOMAXCONN 10000 /* * You can try changing this if you have a machine with bytes of * another size, but no guarantee... */ #define BITS_PER_BYTE 8 /* * Define this if your operating system supports AF_UNIX family * sockets. */ #if !defined(__QNX__) && !defined(__BEOS__) # define HAVE_UNIX_SOCKETS 1 #endif /* * This is the default directory in which AF_UNIX socket files are * placed. Caution: changing this risks breaking your existing client * applications, which are likely to continue to look in the old * directory. But if you just hate the idea of sockets in /tmp, * here's where to twiddle it. You can also override this at runtime * with the postmaster's -k switch. */ #define DEFAULT_PGSOCKET_DIR "/tmp" /* * Defining this will make float4 and float8 operations faster by * suppressing overflow/underflow checks. */ /* #define UNSAFE_FLOATS */ /* * The random() function is expected to yield values between 0 and * MAX_RANDOM_VALUE. Currently, all known implementations yield * 0..2^31-1, so we just hardwire this constant. We could do a * configure test if it proves to be necessary. CAUTION: Think not to * replace this with RAND_MAX. RAND_MAX defines the maximum value of * the older rand() function, which is often different from --- and * considerably inferior to --- random(). */ #define MAX_RANDOM_VALUE (0x7FFFFFFF) /* *------------------------------------------------------------------------ * The following symbols are for enabling debugging code, not for * controlling user-visible features or resource limits. *------------------------------------------------------------------------ */ /* * Define this to cause pfree()'d memory to be cleared immediately, to * facilitate catching bugs that refer to already-freed values. XXX * Right now, this gets defined automatically if --enable-cassert. In * the long term it probably doesn't need to be on by default. */ #ifdef USE_ASSERT_CHECKING #define CLOBBER_FREED_MEMORY #endif /* * Define this to check memory allocation errors (scribbling on more * bytes than were allocated). Right now, this gets defined * automatically if --enable-cassert. In the long term it probably * doesn't need to be on by default. */ #ifdef USE_ASSERT_CHECKING #define MEMORY_CONTEXT_CHECKING #endif /* * Define this to force all parse and plan trees to be passed through * copyObject(), to facilitate catching errors and omissions in * copyObject(). */ /* #define COPY_PARSE_PLAN_TREES */ /* * Enable debugging print statements for lock-related operations. */ /* #define LOCK_DEBUG */ /* * Other debug #defines (documentation, anyone?) */ /* #define IPORTAL_DEBUG */ /* #define HEAPDEBUGALL */ /* #define ISTRATDEBUG */ /* #define ACLDEBUG */ /* #define RTDEBUG */ /* #define GISTDEBUG */