mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
070a6e7a89
so that a simple query with one join would not have to call my_malloc. - Allow lower limites for query_prealloc_size for testing. - Fixed wrong initialization of trans_alloc_block_size
266 lines
9.2 KiB
C
266 lines
9.2 KiB
C
/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
|
|
|
|
/**
|
|
@file
|
|
File containing constants that can be used throughout the server.
|
|
|
|
@note This file shall not contain any includes of any kinds.
|
|
*/
|
|
|
|
#ifndef SQL_CONST_INCLUDED
|
|
#define SQL_CONST_INCLUDED
|
|
|
|
#define LIBLEN FN_REFLEN-FN_LEN /* Max l{ngd p} dev */
|
|
/* extra 4+4 bytes for slave tmp tables */
|
|
#define MAX_DBKEY_LENGTH (NAME_LEN*2+1+1+4+4)
|
|
#define MAX_ALIAS_NAME 256
|
|
#define MAX_FIELD_NAME 34 /* Max colum name length +2 */
|
|
#define MAX_SYS_VAR_LENGTH 32
|
|
#define MAX_KEY MAX_INDEXES /* Max used keys */
|
|
#define MAX_REF_PARTS 32 /* Max parts used as ref */
|
|
#define MAX_KEY_LENGTH 3072 /* max possible key */
|
|
#if SIZEOF_OFF_T > 4
|
|
#define MAX_REFLENGTH 8 /* Max length for record ref */
|
|
#else
|
|
#define MAX_REFLENGTH 4 /* Max length for record ref */
|
|
#endif
|
|
#define MAX_HOSTNAME 61 /* len+1 in mysql.user */
|
|
#define MAX_CONNECTION_NAME NAME_LEN
|
|
|
|
#define MAX_MBWIDTH 3 /* Max multibyte sequence */
|
|
#define MAX_FILENAME_MBWIDTH 5
|
|
#define MAX_FIELD_CHARLENGTH 255
|
|
#define MAX_FIELD_VARCHARLENGTH 65535
|
|
#define MAX_FIELD_BLOBLENGTH UINT_MAX32 /* cf field_blob::get_length() */
|
|
#define CONVERT_IF_BIGGER_TO_BLOB 512 /* Threshold *in characters* */
|
|
|
|
/* Max column width +1 */
|
|
#define MAX_FIELD_WIDTH (MAX_FIELD_CHARLENGTH*MAX_MBWIDTH+1)
|
|
|
|
#define MAX_BIT_FIELD_LENGTH 64 /* Max length in bits for bit fields */
|
|
|
|
#define MAX_DATE_WIDTH 10 /* YYYY-MM-DD */
|
|
#define MIN_TIME_WIDTH 10 /* -HHH:MM:SS */
|
|
#define MAX_TIME_WIDTH 16 /* -DDDDDD HH:MM:SS */
|
|
#define MAX_TIME_FULL_WIDTH 23 /* -DDDDDD HH:MM:SS.###### */
|
|
#define MAX_DATETIME_FULL_WIDTH 26 /* YYYY-MM-DD HH:MM:SS.###### */
|
|
#define MAX_DATETIME_WIDTH 19 /* YYYY-MM-DD HH:MM:SS */
|
|
#define MAX_DATETIME_COMPRESSED_WIDTH 14 /* YYYYMMDDHHMMSS */
|
|
#define MAX_DATETIME_PRECISION 6
|
|
|
|
#define MAX_TABLES (sizeof(table_map)*8-3) /* Max tables in join */
|
|
#define PARAM_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-3))
|
|
#define OUTER_REF_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-2))
|
|
#define RAND_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-1))
|
|
#define PSEUDO_TABLE_BITS (PARAM_TABLE_BIT | OUTER_REF_TABLE_BIT | \
|
|
RAND_TABLE_BIT)
|
|
#define MAX_FIELDS 4096 /* Limit in the .frm file */
|
|
#define MAX_PARTITIONS 8192
|
|
|
|
#define MAX_SELECT_NESTING (sizeof(nesting_map)*8-1)
|
|
|
|
#define MAX_SORT_MEMORY 2048*1024
|
|
#define MIN_SORT_MEMORY 1024
|
|
|
|
/* Some portable defines */
|
|
|
|
#define STRING_BUFFER_USUAL_SIZE 80
|
|
|
|
/* Memory allocated when parsing a statement / saving a statement */
|
|
#define MEM_ROOT_BLOCK_SIZE 8192
|
|
#define MEM_ROOT_PREALLOC 8192
|
|
#define TRANS_MEM_ROOT_BLOCK_SIZE 4096
|
|
#define TRANS_MEM_ROOT_PREALLOC 4096
|
|
|
|
#define DEFAULT_ERROR_COUNT 64
|
|
#define EXTRA_RECORDS 10 /* Extra records in sort */
|
|
#define SCROLL_EXTRA 5 /* Extra scroll-rows. */
|
|
#define FIELD_NAME_USED ((uint) 32768) /* Bit set if fieldname used */
|
|
#define FORM_NAME_USED ((uint) 16384) /* Bit set if formname used */
|
|
#define FIELD_NR_MASK 16383 /* To get fieldnumber */
|
|
#define FERR -1 /* Error from my_functions */
|
|
#define CREATE_MODE 0 /* Default mode on new files */
|
|
#define NAMES_SEP_CHAR 255 /* Char to sep. names */
|
|
|
|
#define READ_RECORD_BUFFER (uint) (IO_SIZE*8) /* Pointer_buffer_size */
|
|
#define DISK_BUFFER_SIZE (uint) (IO_SIZE*16) /* Size of diskbuffer */
|
|
|
|
#define FRM_VER_TRUE_VARCHAR (FRM_VER+4) /* 10 */
|
|
|
|
/***************************************************************************
|
|
Configuration parameters
|
|
****************************************************************************/
|
|
|
|
#define ACL_CACHE_SIZE 256
|
|
#define MAX_PASSWORD_LENGTH 32
|
|
#define HOST_CACHE_SIZE 128
|
|
#define MAX_ACCEPT_RETRY 10 // Test accept this many times
|
|
#define MAX_FIELDS_BEFORE_HASH 32
|
|
#define USER_VARS_HASH_SIZE 16
|
|
#define TABLE_OPEN_CACHE_MIN 400
|
|
#define TABLE_OPEN_CACHE_DEFAULT 400
|
|
#define TABLE_DEF_CACHE_DEFAULT 400
|
|
/**
|
|
We must have room for at least 400 table definitions in the table
|
|
cache, since otherwise there is no chance prepared
|
|
statements that use these many tables can work.
|
|
Prepared statements use table definition cache ids (table_map_id)
|
|
as table version identifiers. If the table definition
|
|
cache size is less than the number of tables used in a statement,
|
|
the contents of the table definition cache is guaranteed to rotate
|
|
between a prepare and execute. This leads to stable validation
|
|
errors. In future we shall use more stable version identifiers,
|
|
for now the only solution is to ensure that the table definition
|
|
cache can contain at least all tables of a given statement.
|
|
*/
|
|
#define TABLE_DEF_CACHE_MIN 400
|
|
|
|
/**
|
|
Maximum number of connections default value.
|
|
151 is larger than Apache's default max children,
|
|
to avoid "too many connections" error in a common setup.
|
|
*/
|
|
#define MAX_CONNECTIONS_DEFAULT 151
|
|
|
|
/*
|
|
Stack reservation.
|
|
Feel free to raise this by the smallest amount you can to get the
|
|
"execution_constants" test to pass.
|
|
*/
|
|
#define STACK_MIN_SIZE 16000 // Abort if less stack during eval.
|
|
|
|
#define STACK_MIN_SIZE_FOR_OPEN 1024*80
|
|
#define STACK_BUFF_ALLOC 352 ///< For stack overrun checks
|
|
#ifndef MYSQLD_NET_RETRY_COUNT
|
|
#define MYSQLD_NET_RETRY_COUNT 10 ///< Abort read after this many int.
|
|
#endif
|
|
|
|
#define QUERY_ALLOC_BLOCK_SIZE 16384
|
|
#define QUERY_ALLOC_PREALLOC_SIZE 24576
|
|
#define TRANS_ALLOC_BLOCK_SIZE 8192
|
|
#define TRANS_ALLOC_PREALLOC_SIZE 4096
|
|
#define RANGE_ALLOC_BLOCK_SIZE 4096
|
|
#define ACL_ALLOC_BLOCK_SIZE 1024
|
|
#define UDF_ALLOC_BLOCK_SIZE 1024
|
|
#define TABLE_ALLOC_BLOCK_SIZE 1024
|
|
#define WARN_ALLOC_BLOCK_SIZE 2048
|
|
#define WARN_ALLOC_PREALLOC_SIZE 1024
|
|
|
|
/*
|
|
The following parameters is to decide when to use an extra cache to
|
|
optimise seeks when reading a big table in sorted order
|
|
*/
|
|
#define MIN_FILE_LENGTH_TO_USE_ROW_CACHE (10L*1024*1024)
|
|
#define MIN_ROWS_TO_USE_TABLE_CACHE 100
|
|
#define MIN_ROWS_TO_USE_BULK_INSERT 100
|
|
|
|
/**
|
|
The following is used to decide if MySQL should use table scanning
|
|
instead of reading with keys. The number says how many evaluation of the
|
|
WHERE clause is comparable to reading one extra row from a table.
|
|
*/
|
|
#define TIME_FOR_COMPARE 5 // 5 compares == one read
|
|
|
|
/**
|
|
Number of comparisons of table rowids equivalent to reading one row from a
|
|
table.
|
|
*/
|
|
#define TIME_FOR_COMPARE_ROWID (TIME_FOR_COMPARE*100)
|
|
|
|
/* cost1 is better that cost2 only if cost1 + COST_EPS < cost2 */
|
|
#define COST_EPS 0.001
|
|
|
|
/*
|
|
For sequential disk seeks the cost formula is:
|
|
DISK_SEEK_BASE_COST + DISK_SEEK_PROP_COST * #blocks_to_skip
|
|
|
|
The cost of average seek
|
|
DISK_SEEK_BASE_COST + DISK_SEEK_PROP_COST*BLOCKS_IN_AVG_SEEK =1.0.
|
|
*/
|
|
#define DISK_SEEK_BASE_COST ((double)0.9)
|
|
|
|
#define BLOCKS_IN_AVG_SEEK 128
|
|
|
|
#define DISK_SEEK_PROP_COST ((double)0.1/BLOCKS_IN_AVG_SEEK)
|
|
|
|
|
|
/**
|
|
Number of rows in a reference table when refereed through a not unique key.
|
|
This value is only used when we don't know anything about the key
|
|
distribution.
|
|
*/
|
|
#define MATCHING_ROWS_IN_OTHER_TABLE 10
|
|
|
|
/*
|
|
Subquery materialization-related constants
|
|
*/
|
|
#define HEAP_TEMPTABLE_LOOKUP_COST 0.05
|
|
#define DISK_TEMPTABLE_LOOKUP_COST 1.0
|
|
|
|
#define MY_CHARSET_BIN_MB_MAXLEN 1
|
|
|
|
/** Don't pack string keys shorter than this (if PACK_KEYS=1 isn't used). */
|
|
#define KEY_DEFAULT_PACK_LENGTH 8
|
|
|
|
/** Characters shown for the command in 'show processlist'. */
|
|
#define PROCESS_LIST_WIDTH 100
|
|
/* Characters shown for the command in 'information_schema.processlist' */
|
|
#define PROCESS_LIST_INFO_WIDTH 65535
|
|
|
|
#define PRECISION_FOR_DOUBLE 53
|
|
#define PRECISION_FOR_FLOAT 24
|
|
|
|
/* -[digits].E+## */
|
|
#define MAX_FLOAT_STR_LENGTH (FLT_DIG + 6)
|
|
/* -[digits].E+### */
|
|
#define MAX_DOUBLE_STR_LENGTH (DBL_DIG + 7)
|
|
|
|
/*
|
|
Default time to wait before aborting a new client connection
|
|
that does not respond to "initial server greeting" timely
|
|
*/
|
|
#define CONNECT_TIMEOUT 10
|
|
|
|
/* The following can also be changed from the command line */
|
|
#define DEFAULT_CONCURRENCY 10
|
|
#define DELAYED_LIMIT 100 /**< pause after xxx inserts */
|
|
#define DELAYED_QUEUE_SIZE 1000
|
|
#define DELAYED_WAIT_TIMEOUT 5*60 /**< Wait for delayed insert */
|
|
#define MAX_CONNECT_ERRORS 100 ///< errors before disabling host
|
|
|
|
#define LONG_TIMEOUT ((ulong) 3600L*24L*365L)
|
|
|
|
/**
|
|
Maximum length of time zone name that we support (Time zone name is
|
|
char(64) in db). mysqlbinlog needs it.
|
|
*/
|
|
#define MAX_TIME_ZONE_NAME_LENGTH (NAME_LEN + 1)
|
|
|
|
#if defined(__WIN__)
|
|
|
|
#define INTERRUPT_PRIOR -2
|
|
#define CONNECT_PRIOR -1
|
|
#define WAIT_PRIOR 0
|
|
#define QUERY_PRIOR 2
|
|
#else
|
|
#define INTERRUPT_PRIOR 10
|
|
#define CONNECT_PRIOR 9
|
|
#define WAIT_PRIOR 8
|
|
#define QUERY_PRIOR 6
|
|
#endif /* __WIN92__ */
|
|
|
|
#endif /* SQL_CONST_INCLUDED */
|