标签：des style blog io color os ar for sp
.frm
.myd
.myi
insert delayted
show variables like ‘%delayed%‘
lock
read,
write,
read local
pointer
优先级
low_priovity
height_priovity
导出数据到文件
select * from t1 into outfile ‘/data.data‘ fields terminated by ‘,‘ enclosed by ‘"‘;
load data in file
load data infile ‘/data.data‘ into table t2 fields terminated by ‘,‘ enclosed by ‘"‘;
行格式: dynamic,fixed,compressed
决定于行包含的数据类型.
hexdump -C /data/t.MYD
对于 fix 行格式的表,手工录入的数据需要做如下处理
check table t;
optimize table t;
repair table t;
动态行格式,如果行太长的话还存在行迁移.迁移
SELECT [ALL | DISTINCT | DISTINCTROW ] [HIGH_PRIORITY] [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT] [SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS] select_expr [, select_expr ...] [FROM table_references [PARTITION partition_list] [WHERE where_condition] [GROUP BY {col_name | expr | position} [ASC | DESC], ... [WITH ROLLUP]] [HAVING where_condition] [ORDER BY {col_name | expr | position} [ASC | DESC], ...] [LIMIT {[offset,] row_count | row_count OFFSET offset}] [PROCEDURE procedure_name(argument_list)] [INTO OUTFILE ‘file_name‘ [CHARACTER SET charset_name] export_options | INTO DUMPFILE ‘file_name‘ | INTO var_name [, var_name]] [FOR UPDATE | LOCK IN SHARE MODE]]
LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL] INFILE ‘file_name‘ [REPLACE | IGNORE] INTO TABLE tbl_name [PARTITION (partition_name,...)] [CHARACTER SET charset_name] [{FIELDS | COLUMNS} [TERMINATED BY ‘string‘] [[OPTIONALLY] ENCLOSED BY ‘char‘] [ESCAPED BY ‘char‘] ] [LINES [STARTING BY ‘string‘] [TERMINATED BY ‘string‘] ] [IGNORE number {LINES | ROWS}] [(col_name_or_user_var,...)] [SET col_name = expr,...]
标签：des style blog io color os ar for sp
原文地址：http://www.cnblogs.com/mjorcen/p/4059751.html
