HowToBSD » mysql

1030 – Got error -1 from storage engine

admin — Sun, 13 Nov 2011 23:39:03 +0000

I am using on one project InnoDB type of tables. There is very important have actual data. So I am actively using foreign keys for tables linking. And once I came across problem when tried to delete from table (`group`) which linked by foreign key with another table (`subgroup`) which linked by foreign key with another table (`item`).
This is error shown by phpmyadmin:
Error SQL query: DELETE FROM `fancypets`.`groups` WHERE `groups`.`group_id` =1 MySQL said: Documentation #1030 - Got error -1 from storage engine

this error a got through mysql command line:

mysql> delete from groups where `group_id`=4; ERROR 1030 (HY000): Got error -1 from storage engine

It is mysql’s error log:

Cannot delete/update rows with cascading foreign key constraints that exceed max depth of 250
If you use 5.1.51- Just update your mysql-server version.
This is bug of mysql-server-5.1.51 – after:
#portupgrade mysql-server

problem disappeared.

mysqldump on FreeBSD

admin — Tue, 05 Jul 2011 16:32:02 +0000

Just a few notes about mysqldump.

Create dump of mysql base:

# mysqldump -uDBUSER -pPASSWORD DBNAME > filename.sql

or
# mysqldump --user=username --password=password DBNAME > filename.sql

if you need to make dump of a few databases you can use parametr -B (or –databases):

mysqldump -uDBUSER -pPASSWORD -B DBNAME1 DBNAME2 > filename.sql

Make dump of the all Databases on host:
mysqldump -uDBUSER -pPASSWORD -A > filename.sql

If you need only dump structure of database (without data):

mysqldump -uDBUSER -pPASSWORD --no-data DBNAME > filename.sql

If you want to make limited by records mysqldump, next command especially for you (It was really cool command when I need dump and then move test copy of project with enormous mysql database):

mysqldump -uDBUSER -pPASSWORD --where="true limit 100" DBNAME > filename.sql

this command will dump your database with defined amount records in each table.

Mysql log queries FreeBSD

admin — Thu, 10 Mar 2011 09:06:41 +0000

If you want to activate logging of mysql queries, add in your my.cnf (by default it is /var/db/mysql/my.cnf)
in [mysqld] section:

log=/var/log/mysql.log

create log file:

#touch /var/log/mysql.log #chmod 666 /var/log/mysql.log

and restart mysql-server:

#/usr/local/etc/rc.d/mysql-server restart (it can be different on you server)

That is all.

PS: I don’t recommend you use it on hight loaded servers permanently. Use it only for debugging.