Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I need to know if this is the correct way (not losing written data while backing up) to backup the binary files?
1.
LOCK TABLES
tbl_0 READ,
tbl_1 READ,
tbl_2 READ
FLUSH TABLES WITH READ LOCK
2.
copy *.frm, *.myd, *.myi files
3.
UNLOCK TABLES
It is not sufficient to do this.
The best is to shut the database down completely, and copy the entire contents of the data directory.
Alternatively, you may leave the database running and take an atomic filesystem snapshot.
If you are sure that you only use MyISAM tables (and InnoDB is completely disabled in your system, as are other engines), you CAN potentially take a dump under a global lock taken with “FLUSH TABLES WITH READ LOCK”. This does impact the system but it’s not as bad as a shutdown.
Note that if you have any InnoDB tables – any at all, present anywhere in the server – then you can’t take a backup this way. “FLUSH TABLES WITH READ LOCK” is not sufficient to backup innodb.