Importing a database as a data file directory
I have a dual-boot OS X/Ubuntu 12.04 arrangement on a mac mini. The ubuntu system has failed and I am unable to boot it. I have one database on the ubuntu partition that was not backed up. I am able to mount the ubuntu partion with fuse-ext2 from Mac OS X, thus I can read and copy the mysql data files at /var/lib/mysql on the ubuntu partition. I presume that I should be able to retrieve the database by just copying it to /opt/local/var/db/mysql5 - the location of the mysql datafiles on the mac partition - and setting ownership and permissions. So, this is a Help me before I hurt myself sort of question: Are there any caveats and gotchas to consider? thanks -- Tim tim at tee jay forty nine dot com or akwebsoft dot com http://www.akwebsoft.com, http://www.tj49.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Importing a database as a data file directory
So, this is a Help me before I hurt myself sort of question: Are there any caveats and gotchas to consider? Do you know if the database was shut down properly? Or did Ubunto crash and die and your partition become unbootable while the database was in active use? Either way, you need to make sure MySQL is shut down when you move the files, and then repair them after starting. I've had good experiences moving MyISAM files that way, but bad experience moving INNODB files. I suspect the latter are more aggressively cached. Mass media must constantly manipulate and deceive us in order to sell products... The most fundamental deception perpetrated on the public is that consumption of material goods is the source of human happiness. A secondary deception is hiding the fact that such consumption leads to major collateral damage -- the possible end of human life on the planet. -- Pat Murphy Jan Steinman, EcoReality Co-op -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Importing a database as a data file directory
Am 05.10.2014 um 21:29 schrieb Tim Johnson: I have a dual-boot OS X/Ubuntu 12.04 arrangement on a mac mini. The ubuntu system has failed and I am unable to boot it. I have one database on the ubuntu partition that was not backed up. I am able to mount the ubuntu partion with fuse-ext2 from Mac OS X, thus I can read and copy the mysql data files at /var/lib/mysql on the ubuntu partition. I presume that I should be able to retrieve the database by just copying it to /opt/local/var/db/mysql5 - the location of the mysql datafiles on the mac partition - and setting ownership and permissions. So, this is a Help me before I hurt myself sort of question: Are there any caveats and gotchas to consider? in case of MyISAM a no-brainer * stop the db server * copy the folder there * set permissions * start the server * run mysql_upgrade --force -u root -p well, in case of replication you might want to rebuild the slave(s) from scratch but that was it - doing this regulary to rsync whole databases from stopped replication slaves as well as the document root on testing machines signature.asc Description: OpenPGP digital signature
Re: Importing a database as a data file directory
* Jan Steinman j...@ecoreality.org [141005 13:12]: So, this is a Help me before I hurt myself sort of question: Are there any caveats and gotchas to consider? Do you know if the database was shut down properly? Or did Ubunto crash and die and your partition become unbootable while the database was in active use? The database had been shut down, no symptom occurred when the OS was booted, I just couldn't reboot (for starters) Either way, you need to make sure MySQL is shut down when you move the files, and then repair them after starting. Good tip. I've had good experiences moving MyISAM files that way, but bad experience moving INNODB files. I suspect the latter are more aggressively cached. They are MyISAM ... Thank you -- Tim tim at tee jay forty nine dot com or akwebsoft dot com http://www.akwebsoft.com, http://www.tj49.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Importing a database as a data file directory
* Reindl Harald h.rei...@thelounge.net [141005 13:12]: Am 05.10.2014 um 21:29 schrieb Tim Johnson: I have a dual-boot OS X/Ubuntu 12.04 arrangement on a mac mini. The ubuntu system has failed and I am unable to boot it. I have one database on the ubuntu partition that was not backed up. I am able to mount the ubuntu partion with fuse-ext2 from Mac OS X, thus I can read and copy the mysql data files at /var/lib/mysql on the ubuntu partition. I presume that I should be able to retrieve the database by just copying it to /opt/local/var/db/mysql5 - the location of the mysql datafiles on the mac partition - and setting ownership and permissions. So, this is a Help me before I hurt myself sort of question: Are there any caveats and gotchas to consider? in case of MyISAM a no-brainer Yup. MyISAM ... * stop the db server * copy the folder there * set permissions * start the server * run mysql_upgrade --force -u root -p Great! thanks for the detail well, in case of replication you might want to rebuild the slave(s) from scratch but that was it - doing this regulary to rsync whole databases from stopped replication slaves as well as the document root on testing machines Got it. Thank you -- Tim tim at tee jay forty nine dot com or akwebsoft dot com http://www.akwebsoft.com, http://www.tj49.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Importing a database as a data file directory
Am 05.10.2014 um 22:39 schrieb Jan Steinman: I've had good experiences moving MyISAM files that way, but bad experience moving INNODB files. I suspect the latter are more aggressively cached simply no, no and no again independent of innodb_file_per_table = 1 there is *always* a global table-space (ibdata1) and you just can't move around innodb databases on file-system level - there is not but and if and it has nothing to do with caching if caching would matter in that context it just would not be part of the game in case off a not running service http://www.xaprb.com/blog/2012/09/07/measuring-free-space-in-innodbs-global-tablespace/ signature.asc Description: OpenPGP digital signature
