mysql information_schemaデータベースの概要:
20091 ワード
1、CHARACTER_SETS
CREATE TEMPORARY TABLE `CHARACTER_SETS` (
`CHARACTER_SET_NAME` varchar(32) NOT NULL DEFAULT '', ， set names utf8；
`DEFAULT_COLLATE_NAME` varchar(32) NOT NULL DEFAULT '',
`DESCRIPTION` varchar(60) NOT NULL DEFAULT '',
`MAXLEN` bigint(3) NOT NULL DEFAULT '0' ， utf8 3
) ENGINE=MEMORY DEFAULT CHARSET=utf8
mysql 。
2、COLUMNS ，
CREATE TEMPORARY TABLE `COLUMNS` (
`TABLE_CATALOG` varchar(512) NOT NULL DEFAULT '',
`TABLE_SCHEMA` varchar(64) NOT NULL DEFAULT '',
`TABLE_NAME` varchar(64) NOT NULL DEFAULT '',
`COLUMN_NAME` varchar(64) NOT NULL DEFAULT '',
`ORDINAL_POSITION` bigint(21) unsigned NOT NULL DEFAULT '0',
`COLUMN_DEFAULT` longtext,
`IS_NULLABLE` varchar(3) NOT NULL DEFAULT '', null
`DATA_TYPE` varchar(64) NOT NULL DEFAULT '',
`CHARACTER_MAXIMUM_LENGTH` bigint(21) unsigned DEFAULT NULL,
`CHARACTER_OCTET_LENGTH` bigint(21) unsigned DEFAULT NULL,
`NUMERIC_PRECISION` bigint(21) unsigned DEFAULT NULL,
`NUMERIC_SCALE` bigint(21) unsigned DEFAULT NULL,
`DATETIME_PRECISION` bigint(21) unsigned DEFAULT NULL,
`CHARACTER_SET_NAME` varchar(32) DEFAULT NULL,
`COLLATION_NAME` varchar(32) DEFAULT NULL,
`COLUMN_TYPE` longtext NOT NULL,
`COLUMN_KEY` varchar(3) NOT NULL DEFAULT '',
`EXTRA` varchar(30) NOT NULL DEFAULT '',
`PRIVILEGES` varchar(80) NOT NULL DEFAULT '', ， select,insert,update
`COLUMN_COMMENT` varchar(1024) NOT NULL DEFAULT ''
) ENGINE=MyISAM DEFAULT CHARSET=utf8
3、ENGINES，
CREATE TEMPORARY TABLE `ENGINES` (
`ENGINE` varchar(64) NOT NULL DEFAULT '',
`SUPPORT` varchar(8) NOT NULL DEFAULT '',
`COMMENT` varchar(80) NOT NULL DEFAULT '',
`TRANSACTIONS` varchar(3) DEFAULT NULL,
`XA` varchar(3) DEFAULT NULL, XA
`SAVEPOINTS` varchar(3) DEFAULT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8
4、GLOBAL_STATUS ， ， show status 。（ session ）
CREATE TEMPORARY TABLE `GLOBAL_STATUS` (
`VARIABLE_NAME` varchar(64) NOT NULL DEFAULT '',
`VARIABLE_VALUE` varchar(2048) DEFAULT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8
。
5、GLOBAL_VARIABLES ， （ session ）
CREATE TEMPORARY TABLE `GLOBAL_VARIABLES` (
`VARIABLE_NAME` varchar(64) NOT NULL DEFAULT '',
`VARIABLE_VALUE` varchar(2048) DEFAULT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8
，mysql set global variabe，
6、PROCESSLIST ， ，show processlist
CREATE TEMPORARY TABLE `PROCESSLIST` (
`ID` bigint(21) unsigned NOT NULL DEFAULT '0',
`USER` varchar(16) NOT NULL DEFAULT '',
`HOST` varchar(64) NOT NULL DEFAULT '',
`DB` varchar(64) DEFAULT NULL,
`COMMAND` varchar(16) NOT NULL DEFAULT '',
`TIME` int(7) NOT NULL DEFAULT '0',
`STATE` varchar(64) DEFAULT NULL,
`INFO` longtext,
`TIME_MS` bigint(21) NOT NULL DEFAULT '0',
`ROWS_SENT` bigint(21) unsigned NOT NULL DEFAULT '0',
`ROWS_EXAMINED` bigint(21) unsigned NOT NULL DEFAULT '0'
) ENGINE=MyISAM DEFAULT CHARSET=utf8
7、PROFILING ，sql profile ， select ，
CREATE TEMPORARY TABLE `PROFILING` (
`QUERY_ID` int(20) NOT NULL DEFAULT '0',
`SEQ` int(20) NOT NULL DEFAULT '0',
`STATE` varchar(30) NOT NULL DEFAULT '',
`DURATION` decimal(9,6) NOT NULL DEFAULT '0.000000',
`CPU_USER` decimal(9,6) DEFAULT NULL,
`CPU_SYSTEM` decimal(9,6) DEFAULT NULL,
`CONTEXT_VOLUNTARY` int(20) DEFAULT NULL,
`CONTEXT_INVOLUNTARY` int(20) DEFAULT NULL,
`BLOCK_OPS_IN` int(20) DEFAULT NULL,
`BLOCK_OPS_OUT` int(20) DEFAULT NULL,
`MESSAGES_SENT` int(20) DEFAULT NULL,
`MESSAGES_RECEIVED` int(20) DEFAULT NULL,
`PAGE_FAULTS_MAJOR` int(20) DEFAULT NULL,
`PAGE_FAULTS_MINOR` int(20) DEFAULT NULL,
`SWAPS` int(20) DEFAULT NULL,
`SOURCE_FUNCTION` varchar(30) DEFAULT NULL,
`SOURCE_FILE` varchar(20) DEFAULT NULL,
`SOURCE_LINE` int(20) DEFAULT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8
8、SCHEMA_PRIVILEGES ，
CREATE TEMPORARY TABLE `SCHEMA_PRIVILEGES` (
`GRANTEE` varchar(81) NOT NULL DEFAULT '', @host
`TABLE_CATALOG` varchar(512) NOT NULL DEFAULT '',
`TABLE_SCHEMA` varchar(64) NOT NULL DEFAULT '',
`PRIVILEGE_TYPE` varchar(64) NOT NULL DEFAULT '', ， insert
`IS_GRANTABLE` varchar(3) NOT NULL DEFAULT ''
) ENGINE=MEMORY DEFAULT CHARSET=utf8
9、SESSION_STATUS，SESSION_VARIABLES， GLOBAL_STATUS，GLOBAL_VARIABLES， session
10、STATISTICS ， 。
CREATE TEMPORARY TABLE `STATISTICS` (
`TABLE_CATALOG` varchar(512) NOT NULL DEFAULT '',
`TABLE_SCHEMA` varchar(64) NOT NULL DEFAULT '',
`TABLE_NAME` varchar(64) NOT NULL DEFAULT '',
`NON_UNIQUE` bigint(1) NOT NULL DEFAULT '0', ，0 ，1
`INDEX_SCHEMA` varchar(64) NOT NULL DEFAULT '',
`INDEX_NAME` varchar(64) NOT NULL DEFAULT '',
`SEQ_IN_INDEX` bigint(2) NOT NULL DEFAULT '0',
`COLUMN_NAME` varchar(64) NOT NULL DEFAULT '',
`COLLATION` varchar(1) DEFAULT NULL,
`CARDINALITY` bigint(21) DEFAULT NULL,
`SUB_PART` bigint(3) DEFAULT NULL,
`PACKED` varchar(10) DEFAULT NULL,
`NULLABLE` varchar(3) NOT NULL DEFAULT '',
`INDEX_TYPE` varchar(16) NOT NULL DEFAULT '', ， BTree
`COMMENT` varchar(16) DEFAULT NULL,
`INDEX_COMMENT` varchar(1024) NOT NULL DEFAULT ''
) ENGINE=MEMORY DEFAULT CHARSET=utf8
11、TABLES ， 。
CREATE TEMPORARY TABLE `TABLES` (
`TABLE_CATALOG` varchar(512) NOT NULL DEFAULT '',
`TABLE_SCHEMA` varchar(64) NOT NULL DEFAULT '',
`TABLE_NAME` varchar(64) NOT NULL DEFAULT '',
`TABLE_TYPE` varchar(64) NOT NULL DEFAULT '',
`ENGINE` varchar(64) DEFAULT NULL,
`VERSION` bigint(21) unsigned DEFAULT NULL,
`ROW_FORMAT` varchar(20) DEFAULT NULL,
`TABLE_ROWS` bigint(21) unsigned DEFAULT NULL,
`AVG_ROW_LENGTH` bigint(21) unsigned DEFAULT NULL,
`DATA_LENGTH` bigint(21) unsigned DEFAULT NULL,
`MAX_DATA_LENGTH` bigint(21) unsigned DEFAULT NULL,
`INDEX_LENGTH` bigint(21) unsigned DEFAULT NULL,
`DATA_FREE` bigint(21) unsigned DEFAULT NULL,
`AUTO_INCREMENT` bigint(21) unsigned DEFAULT NULL,
`CREATE_TIME` datetime DEFAULT NULL,
`UPDATE_TIME` datetime DEFAULT NULL,
`CHECK_TIME` datetime DEFAULT NULL,
`TABLE_COLLATION` varchar(32) DEFAULT NULL,
`CHECKSUM` bigint(21) unsigned DEFAULT NULL,
`CREATE_OPTIONS` varchar(255) DEFAULT NULL,
`TABLE_COMMENT` varchar(2048) NOT NULL DEFAULT ''
) ENGINE=MEMORY DEFAULT CHARSET=utf8
beta ， diff ， sql ， ，
。