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249 lines
8.7 KiB
C
249 lines
8.7 KiB
C
/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file
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File containing constants that can be used throughout the server.
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@note This file shall not contain any includes of any kinds.
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*/
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#ifndef SQL_CONST_INCLUDED
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#define SQL_CONST_INCLUDED
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#define LIBLEN FN_REFLEN-FN_LEN /* Max l{ngd p} dev */
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/* extra 4+4 bytes for slave tmp tables */
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#define MAX_DBKEY_LENGTH (NAME_LEN*2+1+1+4+4)
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#define MAX_ALIAS_NAME 256
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#define MAX_FIELD_NAME 34 /* Max colum name length +2 */
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#define MAX_SYS_VAR_LENGTH 32
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#define MAX_KEY MAX_INDEXES /* Max used keys */
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#define MAX_REF_PARTS 16 /* Max parts used as ref */
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#define MAX_KEY_LENGTH 3072 /* max possible key */
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#if SIZEOF_OFF_T > 4
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#define MAX_REFLENGTH 8 /* Max length for record ref */
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#else
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#define MAX_REFLENGTH 4 /* Max length for record ref */
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#endif
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#define MAX_HOSTNAME 61 /* len+1 in mysql.user */
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#define MAX_MBWIDTH 3 /* Max multibyte sequence */
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#define MAX_FIELD_CHARLENGTH 255
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#define MAX_FIELD_VARCHARLENGTH 65535
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#define MAX_FIELD_BLOBLENGTH UINT_MAX32 /* cf field_blob::get_length() */
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#define CONVERT_IF_BIGGER_TO_BLOB 512 /* Used for CREATE ... SELECT */
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/* Max column width +1 */
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#define MAX_FIELD_WIDTH (MAX_FIELD_CHARLENGTH*MAX_MBWIDTH+1)
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#define MAX_BIT_FIELD_LENGTH 64 /* Max length in bits for bit fields */
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#define MAX_DATE_WIDTH 10 /* YYYY-MM-DD */
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#define MAX_TIME_WIDTH 23 /* -DDDDDD HH:MM:SS.###### */
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#define MAX_DATETIME_FULL_WIDTH 29 /* YYYY-MM-DD HH:MM:SS.###### AM */
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#define MAX_DATETIME_WIDTH 19 /* YYYY-MM-DD HH:MM:SS */
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#define MAX_DATETIME_COMPRESSED_WIDTH 14 /* YYYYMMDDHHMMSS */
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#define MAX_TABLES (sizeof(table_map)*8-3) /* Max tables in join */
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#define PARAM_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-3))
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#define OUTER_REF_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-2))
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#define RAND_TABLE_BIT (((table_map) 1) << (sizeof(table_map)*8-1))
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#define PSEUDO_TABLE_BITS (PARAM_TABLE_BIT | OUTER_REF_TABLE_BIT | \
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RAND_TABLE_BIT)
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#define MAX_FIELDS 4096 /* Limit in the .frm file */
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#define MAX_PARTITIONS 1024
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#define MAX_SELECT_NESTING (sizeof(nesting_map)*8-1)
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#define MAX_SORT_MEMORY 2048*1024
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#define MIN_SORT_MEMORY 32*1024
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/* Some portable defines */
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#define portable_sizeof_char_ptr 8
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#define STRING_BUFFER_USUAL_SIZE 80
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/* Memory allocated when parsing a statement / saving a statement */
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#define MEM_ROOT_BLOCK_SIZE 8192
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#define MEM_ROOT_PREALLOC 8192
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#define TRANS_MEM_ROOT_BLOCK_SIZE 4096
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#define TRANS_MEM_ROOT_PREALLOC 4096
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#define DEFAULT_ERROR_COUNT 64
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#define EXTRA_RECORDS 10 /* Extra records in sort */
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#define SCROLL_EXTRA 5 /* Extra scroll-rows. */
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#define FIELD_NAME_USED ((uint) 32768) /* Bit set if fieldname used */
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#define FORM_NAME_USED ((uint) 16384) /* Bit set if formname used */
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#define FIELD_NR_MASK 16383 /* To get fieldnumber */
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#define FERR -1 /* Error from my_functions */
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#define CREATE_MODE 0 /* Default mode on new files */
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#define NAMES_SEP_CHAR '\377' /* Char to sep. names */
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#define READ_RECORD_BUFFER (uint) (IO_SIZE*8) /* Pointer_buffer_size */
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#define DISK_BUFFER_SIZE (uint) (IO_SIZE*16) /* Size of diskbuffer */
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#define FRM_VER_TRUE_VARCHAR (FRM_VER+4) /* 10 */
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/***************************************************************************
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Configuration parameters
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****************************************************************************/
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#define ACL_CACHE_SIZE 256
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#define MAX_PASSWORD_LENGTH 32
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#define HOST_CACHE_SIZE 128
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#define MAX_ACCEPT_RETRY 10 // Test accept this many times
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#define MAX_FIELDS_BEFORE_HASH 32
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#define USER_VARS_HASH_SIZE 16
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#define TABLE_OPEN_CACHE_MIN 400
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#define TABLE_OPEN_CACHE_DEFAULT 400
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#define TABLE_DEF_CACHE_DEFAULT 400
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/**
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We must have room for at least 400 table definitions in the table
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cache, since otherwise there is no chance prepared
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statements that use these many tables can work.
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Prepared statements use table definition cache ids (table_map_id)
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as table version identifiers. If the table definition
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cache size is less than the number of tables used in a statement,
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the contents of the table definition cache is guaranteed to rotate
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between a prepare and execute. This leads to stable validation
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errors. In future we shall use more stable version identifiers,
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for now the only solution is to ensure that the table definition
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cache can contain at least all tables of a given statement.
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*/
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#define TABLE_DEF_CACHE_MIN 400
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/*
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Stack reservation.
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Feel free to raise this by the smallest amount you can to get the
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"execution_constants" test to pass.
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*/
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#define STACK_MIN_SIZE 16000 // Abort if less stack during eval.
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#define STACK_MIN_SIZE_FOR_OPEN 1024*80
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#define STACK_BUFF_ALLOC 352 ///< For stack overrun checks
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#ifndef MYSQLD_NET_RETRY_COUNT
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#define MYSQLD_NET_RETRY_COUNT 10 ///< Abort read after this many int.
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#endif
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#define QUERY_ALLOC_BLOCK_SIZE 8192
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#define QUERY_ALLOC_PREALLOC_SIZE 8192
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#define TRANS_ALLOC_BLOCK_SIZE 4096
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#define TRANS_ALLOC_PREALLOC_SIZE 4096
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#define RANGE_ALLOC_BLOCK_SIZE 4096
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#define ACL_ALLOC_BLOCK_SIZE 1024
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#define UDF_ALLOC_BLOCK_SIZE 1024
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#define TABLE_ALLOC_BLOCK_SIZE 1024
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#define WARN_ALLOC_BLOCK_SIZE 2048
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#define WARN_ALLOC_PREALLOC_SIZE 1024
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/*
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The following parameters is to decide when to use an extra cache to
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optimise seeks when reading a big table in sorted order
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*/
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#define MIN_FILE_LENGTH_TO_USE_ROW_CACHE (10L*1024*1024)
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#define MIN_ROWS_TO_USE_TABLE_CACHE 100
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#define MIN_ROWS_TO_USE_BULK_INSERT 100
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/**
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The following is used to decide if MySQL should use table scanning
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instead of reading with keys. The number says how many evaluation of the
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WHERE clause is comparable to reading one extra row from a table.
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*/
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#define TIME_FOR_COMPARE 5 // 5 compares == one read
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/**
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Number of comparisons of table rowids equivalent to reading one row from a
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table.
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*/
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#define TIME_FOR_COMPARE_ROWID (TIME_FOR_COMPARE*2)
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/*
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For sequential disk seeks the cost formula is:
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DISK_SEEK_BASE_COST + DISK_SEEK_PROP_COST * #blocks_to_skip
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The cost of average seek
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DISK_SEEK_BASE_COST + DISK_SEEK_PROP_COST*BLOCKS_IN_AVG_SEEK =1.0.
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*/
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#define DISK_SEEK_BASE_COST ((double)0.5)
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#define BLOCKS_IN_AVG_SEEK 128
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#define DISK_SEEK_PROP_COST ((double)0.5/BLOCKS_IN_AVG_SEEK)
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/**
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Number of rows in a reference table when refereed through a not unique key.
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This value is only used when we don't know anything about the key
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distribution.
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*/
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#define MATCHING_ROWS_IN_OTHER_TABLE 10
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#define MY_CHARSET_BIN_MB_MAXLEN 1
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/** Don't pack string keys shorter than this (if PACK_KEYS=1 isn't used). */
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#define KEY_DEFAULT_PACK_LENGTH 8
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/** Characters shown for the command in 'show processlist'. */
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#define PROCESS_LIST_WIDTH 100
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/* Characters shown for the command in 'information_schema.processlist' */
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#define PROCESS_LIST_INFO_WIDTH 65535
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#define PRECISION_FOR_DOUBLE 53
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#define PRECISION_FOR_FLOAT 24
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/* -[digits].E+## */
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#define MAX_FLOAT_STR_LENGTH (FLT_DIG + 6)
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/* -[digits].E+### */
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#define MAX_DOUBLE_STR_LENGTH (DBL_DIG + 7)
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/*
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Default time to wait before aborting a new client connection
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that does not respond to "initial server greeting" timely
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*/
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#define CONNECT_TIMEOUT 10
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/* The following can also be changed from the command line */
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#define DEFAULT_CONCURRENCY 10
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#define DELAYED_LIMIT 100 /**< pause after xxx inserts */
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#define DELAYED_QUEUE_SIZE 1000
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#define DELAYED_WAIT_TIMEOUT 5*60 /**< Wait for delayed insert */
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#define FLUSH_TIME 0 /**< Don't flush tables */
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#define MAX_CONNECT_ERRORS 10 ///< errors before disabling host
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#define LONG_TIMEOUT ((ulong) 3600L*24L*365L)
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/**
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Maximum length of time zone name that we support (Time zone name is
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char(64) in db). mysqlbinlog needs it.
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*/
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#define MAX_TIME_ZONE_NAME_LENGTH (NAME_LEN + 1)
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#if defined(__WIN__)
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#undef FLUSH_TIME
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#define FLUSH_TIME 1800 /**< Flush every half hour */
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#define INTERRUPT_PRIOR -2
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#define CONNECT_PRIOR -1
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#define WAIT_PRIOR 0
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#define QUERY_PRIOR 2
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#else
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#define INTERRUPT_PRIOR 10
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#define CONNECT_PRIOR 9
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#define WAIT_PRIOR 8
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#define QUERY_PRIOR 6
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#endif /* __WIN92__ */
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#endif /* SQL_CONST_INCLUDED */
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