How to change max_allowed_packet value in mysql?
If you set it in the cnf(it may be my.ini file) you will likely need to restart the server. Optionally, that is a dynamic variable and can be SET GLOBAL or SET SESSION from the command line as well.So just do as follows.
mysql>show variables like’max_allowed_packet’;
mysql>set global max_allowed_packet=67108864;
mysql>exit;
Note: If you don't use global or use session,after execute exit command,max_allowed_packet value will be still 1048576.
Ïà¹ØÎĵµ£º
mysql ´ó¶ÔÏó´æÈ¡:
ÀàÐÍÒ»°ãÓ¦¸ÃÓÃmediumblod,
blobÖ»ÄÜ´æ2µÄ16´Î·½¸öbyte,
mediumblodÊÇ24´Î·½,
Ò»°ãÀ´Ëµ¹»ÓÃÁË.longblobÊÇ32´Î·½ÓÐЩ´ó.
MYSQLĬÈÏÅäÖÃÖ»ÄÜ´æ1M´óСµÄÎļþ,ÒªÐÞ¸ÄÅäÖÃ,WIN°æ±¾µÄÔÚmysql.iniÎļþÖÐ
ÐÞ¸Ämax_allowed_packet,net_buffer_lengthµÈ¼¸¸ö²ÎÊý,»òÖ±½ÓSET GLOBAL varName=value.
linux°æ± ......
Love in coding...
Free and Susan
[Òý]MySQL INNODBÀàÐͱíµÄÍâ¼ü¹ØÁªÉèÖÃ
Here is a simple example that relates parent and child tables through a single-column foreign key:
CREATE TABLE parent (id INT NOT NULL,
......
GROUP_CONCAT ÊÇÒ»¸öºÏ²¢¶àÐеĺ¯Êý£¬Ò»°ãÓõÄÉÙ£¬ËùÒԺܶàÈ˶¼²»ÖªµÀ£¬ÎÒÒ²ÊÇÒ»¸ö£¬½ñÌìżȻ¿´µ½£¬¹Ê¼ÇÏ·½·¨£»
GROUP_CONCATµÄÓï·¨ÈçÏ£º
GROUP_CONCAT([DISTINCT] expr [,expr ...][ORDER BY {unsigned_integer | col_name | expr}[ASC | DESC] [,col_name ...]][SEPARATOR str_val])
ÏÂÃæÑÝʾһÏÂÕâ¸öº¯Êý£¬ÏȽ¨Á¢Ò ......
ÒÔÏÂת×Ô Osss.cn Óʼþ£¬ÇëʹÓùý¡¢ÕýÔÚʹÓûòÕßÖ§³Ö¿ªÔ´µÄÅóÓÑÖ§³ÖÒ»ÏÂMySql£¬Ð»Ð»¡£
ҲϣÍû½ÌÓý²¿¡¢¿Æ¼¼²¿¸øÓèÖ±½ÓÖ§³Ö£¡
´ó¼ÒºÃ£º½ñÌì¿´µ½ÕâÔòÐÂÎÅ£¬Óë´ó¼Ò¹²Ïíһϣ¬MySQL´´Ê¼ÈËÏ£ÍûÖйúÉÌÎñ²¿ÄܽéÈëOracle&SunÊÕ¹º°¸£¬ºÃÏñ²¢Ã»ÓÐʵÖʽøÕ¹¡£¶ø¶íÂÞ˹Áª°î·´Â¢¶Ï»ú¹¹ÔÚÉÏÖÜÕ¹¿ªµ÷²é¡£Èç¹ûÐèÒªÉÌÎñ² ......
-static 13%
--with-client-ldflags=-all-static
--with-mysqld-ldflags=-all-static
¾²Ì¬Á´½ÓÌá¸ß13%ÐÔÄÜ
Unix Socket 7.5%
--with-unix-socket path=/usr/local/mysql/tmp/mysql.sock
ʹÓÃunixÌ×½Ó×ÖÁ´½ÓÌá¸ß7.5%ÐÔÄÜ£¬ËùÒÔÔÚwindowsÏÂmysqlÐÔÄܿ϶¨²»ÈçunixÏÂÃæ
--enab ......