Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
This only works for MyISAM :-) However, there's another solution where you don't need to shut down, and that works for any engine afaik: rename table oldschema.table to newschema.table; I agree that it's a silly thing to not have, but I can't say that I've encountered a whole lot of instances where I needed it, either. On Fri, Dec 11, 2009 at 7:04 AM, Ken D'Ambrosio k...@jots.org wrote: Uhhh... wow. Unless I'm very, very, very mistaken, I think you're missing something pretty obvious: I believe you can simply a) shut down the database b) mv the directory to a different directory name. *DONE* Your database now has a different name. Boy, that 30 seconds of hard labor was sure faster than waiting a week for SQL dumps. Granted, I can't swear that this is Officially Sanctioned And Approved(tm), but I've done it many times, myself (and, indeed, just verified it under 5.1 to be sure it still worked). Since you are talking such a significant volume of data, I would suggest either testing, or hearing from someone more knowledgeable than I, but I think this problem is substantially smaller than you've let yourself believe. -Ken On Thu, December 10, 2009 11:35 pm, Daevid Vincent wrote: How can it possibly be that mySQL doesn't allow you to rename a database? I can't fathom how this can be a difficult task at all to do. Aren't mySQL databases stored in a directory of the DB name? And for INNODB, can't you just find the spot in the ibdata file and alter whatever needs to be changed? This is absolutely absurd. Not even 5.1 has this most basic of features. We have nearly a billion rows. Exporting to a .sql file and importing again can take nearly a week to do (3 days each way and that doesn't even begin to touch on the fact the server would be down)! WTF!? We're running Ubuntu LTS 8.04 w/ Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2 Even the manual for 5.1 says this can lose data: http://dev.mysql.com/doc/refman/5.1/en/rename-database.html This statement was added in MySQL 5.1.7 but was found to be dangerous and was removed in MySQL 5.1.23...However, use of this statement could result in loss of database contents, which is why it was removed. Do not use RENAME DATABASE in earlier versions in which it is present. Seriously? Please explain why a simple rename of a database is such a daunting task to mySQL/Sun that all their brilliant minds can't figure this one out? Why isn't there even a bug report for this? http://bugs.mysql.com/search.php?search_for=rename+databaseboolean=onst at us[]=Activeseverity=limit=Allorder_by=cmd=displayphpver=os=0os_det ai ls=bug_age=0tags=similar=target=defect_class=allworkaround_viabilit y= allimpact=allfix_risk=allfix_effort=alltriageneeded= -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=...@jots.org -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
On Fri, December 11, 2009 7:38 am, Johan De Meersman wrote: This only works for MyISAM :-) Good to know -- thanks! However, there's another solution where you don't need to shut down, and that works for any engine afaik: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? I agree that it's a silly thing to not have, but I can't say that I've encountered a whole lot of instances where I needed it, either. Agreed. Thanks much! -Ken On Fri, Dec 11, 2009 at 7:04 AM, Ken D'Ambrosio k...@jots.org wrote: Uhhh... wow. Unless I'm very, very, very mistaken, I think you're missing something pretty obvious: I believe you can simply a) shut down the database b) mv the directory to a different directory name. *DONE* Your database now has a different name. Boy, that 30 seconds of hard labor was sure faster than waiting a week for SQL dumps. Granted, I can't swear that this is Officially Sanctioned And Approved(tm), but I've done it many times, myself (and, indeed, just verified it under 5.1 to be sure it still worked). Since you are talking such a significant volume of data, I would suggest either testing, or hearing from someone more knowledgeable than I, but I think this problem is substantially smaller than you've let yourself believe. -Ken On Thu, December 10, 2009 11:35 pm, Daevid Vincent wrote: How can it possibly be that mySQL doesn't allow you to rename a database? I can't fathom how this can be a difficult task at all to do. Aren't mySQL databases stored in a directory of the DB name? And for INNODB, can't you just find the spot in the ibdata file and alter whatever needs to be changed? This is absolutely absurd. Not even 5.1 has this most basic of features. We have nearly a billion rows. Exporting to a .sql file and importing again can take nearly a week to do (3 days each way and that doesn't even begin to touch on the fact the server would be down)! WTF!? We're running Ubuntu LTS 8.04 w/ Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2 Even the manual for 5.1 says this can lose data: http://dev.mysql.com/doc/refman/5.1/en/rename-database.html This statement was added in MySQL 5.1.7 but was found to be dangerous and was removed in MySQL 5.1.23...However, use of this statement could result in loss of database contents, which is why it was removed. Do not use RENAME DATABASE in earlier versions in which it is present. Seriously? Please explain why a simple rename of a database is such a daunting task to mySQL/Sun that all their brilliant minds can't figure this one out? Why isn't there even a bug report for this? http://bugs.mysql.com/search.php?search_for=rename+databaseboolean=on; st at us[]=Activeseverity=limit=Allorder_by=cmd=displayphpver=os=0os _det ai ls=bug_age=0tags=similar=target=defect_class=allworkaround_viab ilit y= allimpact=allfix_risk=allfix_effort=alltriageneeded= -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=...@jots.org -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-)
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
If you want to move the database atomically, a RENAME TABLE statement may have multiple clauses. RENAME TABLE olddb.foo to newdb.foo, olddb.bar to newdb.bar; Here, I hot-swap a new lookup table 'active.geo' into a live system confident that, at any given point, some version of this table always exists: RENAME TABLE active.geo to archive.geo, standby.geo to active geo; - michael dykman On Fri, Dec 11, 2009 at 8:58 AM, Johan De Meersman vegiv...@tuxera.be wrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
Can you use that syntax if the databases are on different file systems? If you can, and the original table is big, the command would take a while as it moved data from one file system to another. On Fri, Dec 11, 2009 at 7:58 AM, Johan De Meersman vegiv...@tuxera.bewrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- Jim Lyons Web developer / Database administrator http://www.weblyons.com
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
According to MySQL docs, it should still work atomically. Granted, I have only used this particular trick when they are on the same filesystem. Copying across filesystems, I imagine it should still be atomic, but your system may be locked for awhile. Obviously, a dedicated RENAME DATABASE command would have the same limitations. - michael dykman On Fri, Dec 11, 2009 at 11:35 AM, Jim Lyons jlyons4...@gmail.com wrote: Can you use that syntax if the databases are on different file systems? If you can, and the original table is big, the command would take a while as it moved data from one file system to another. On Fri, Dec 11, 2009 at 7:58 AM, Johan De Meersman vegiv...@tuxera.bewrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- Jim Lyons Web developer / Database administrator http://www.weblyons.com -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
RE: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
Will this work in 5.0? If I'm reading this right, it seems like this is some kind of trick or loophole then right? If it works and solves my dilemna, I'm fine with that, but I'm just curious. How fast is this? I mean, if I have an 80GB database, is it like a real unix 'mv' command where it simply changing pointers or is it a full on copy/rm? (Assume same filesystem/directory) -Original Message- From: Michael Dykman [mailto:mdyk...@gmail.com] Sent: Friday, December 11, 2009 6:08 AM To: MySql Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? If you want to move the database atomically, a RENAME TABLE statement may have multiple clauses. RENAME TABLE olddb.foo to newdb.foo, olddb.bar to newdb.bar; Here, I hot-swap a new lookup table 'active.geo' into a live system confident that, at any given point, some version of this table always exists: RENAME TABLE active.geo to archive.geo, standby.geo to active geo; - michael dykman On Fri, Dec 11, 2009 at 8:58 AM, Johan De Meersman vegiv...@tuxera.be wrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=dae...@daevid.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
No, not a loophole. Just a plain-old management feature.. there is nothing particularly hacky about it.. this is not trying to leverage undocumented features: this has been a published part of the API for at least a couple of years. On the same file system, yes it should be pretty damned fast. Depending on how your data is stored, it might now be 'quite' as simple as a unix 'mv' command.. if this is a production system, I would recommend you do a dry run with a replicant/slave. No amount of theorizing will tell as much as the experiment. - michael dykman On Fri, Dec 11, 2009 at 4:40 PM, Daevid Vincent dae...@daevid.com wrote: Will this work in 5.0? If I'm reading this right, it seems like this is some kind of trick or loophole then right? If it works and solves my dilemna, I'm fine with that, but I'm just curious. How fast is this? I mean, if I have an 80GB database, is it like a real unix 'mv' command where it simply changing pointers or is it a full on copy/rm? (Assume same filesystem/directory) -Original Message- From: Michael Dykman [mailto:mdyk...@gmail.com] Sent: Friday, December 11, 2009 6:08 AM To: MySql Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? If you want to move the database atomically, a RENAME TABLE statement may have multiple clauses. RENAME TABLE olddb.foo to newdb.foo, olddb.bar to newdb.bar; Here, I hot-swap a new lookup table 'active.geo' into a live system confident that, at any given point, some version of this table always exists: RENAME TABLE active.geo to archive.geo, standby.geo to active geo; - michael dykman On Fri, Dec 11, 2009 at 8:58 AM, Johan De Meersman vegiv...@tuxera.be wrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=dae...@daevid.com -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
On Fri, Dec 11, 2009 at 10:40 PM, Daevid Vincent dae...@daevid.com wrote: Will this work in 5.0? Yes. If I'm reading this right, it seems like this is some kind of trick or loophole then right? If it works and solves my dilemna, I'm fine with that, but I'm just curious. Not really, this is by design afaik. How fast is this? I mean, if I have an 80GB database, is it like a real unix 'mv' command where it simply changing pointers or is it a full on copy/rm? (Assume same filesystem/directory) Don't know, but given that it works with InnoDB, you should be able to easily test on a small dataset by monitoring the size of a 1M autoextend tablespace :-)
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
if you have myisam alone tables you can rename the folder of the database. That can work like rename database. If you have innodb table you have to move one by one table because details of those tables will be stored in innodb shared table space. Moving folder cannot work. Thanks, Saravanan --- On Fri, 12/11/09, Michael Dykman mdyk...@gmail.com wrote: From: Michael Dykman mdyk...@gmail.com Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? To: MySql mysql@lists.mysql.com Date: Friday, December 11, 2009, 10:54 PM No, not a loophole. Just a plain-old management feature.. there is nothing particularly hacky about it.. this is not trying to leverage undocumented features: this has been a published part of the API for at least a couple of years. On the same file system, yes it should be pretty damned fast. Depending on how your data is stored, it might now be 'quite' as simple as a unix 'mv' command.. if this is a production system, I would recommend you do a dry run with a replicant/slave. No amount of theorizing will tell as much as the experiment. - michael dykman On Fri, Dec 11, 2009 at 4:40 PM, Daevid Vincent dae...@daevid.com wrote: Will this work in 5.0? If I'm reading this right, it seems like this is some kind of trick or loophole then right? If it works and solves my dilemna, I'm fine with that, but I'm just curious. How fast is this? I mean, if I have an 80GB database, is it like a real unix 'mv' command where it simply changing pointers or is it a full on copy/rm? (Assume same filesystem/directory) -Original Message- From: Michael Dykman [mailto:mdyk...@gmail.com] Sent: Friday, December 11, 2009 6:08 AM To: MySql Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? If you want to move the database atomically, a RENAME TABLE statement may have multiple clauses. RENAME TABLE olddb.foo to newdb.foo, olddb.bar to newdb.bar; Here, I hot-swap a new lookup table 'active.geo' into a live system confident that, at any given point, some version of this table always exists: RENAME TABLE active.geo to archive.geo, standby.geo to active geo; - michael dykman On Fri, Dec 11, 2009 at 8:58 AM, Johan De Meersman vegiv...@tuxera.be wrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=dae...@daevid.com -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=suzuki_b...@yahoo.com
RE: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
Don't forget triggers, stored routines, views, database/table specific user permissions, and replication/binlog options! Regards, Gavin Towey -Original Message- From: Saravanan [mailto:suzuki_b...@yahoo.com] Sent: Friday, December 11, 2009 2:02 PM To: MySql; Michael Dykman Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? if you have myisam alone tables you can rename the folder of the database. That can work like rename database. If you have innodb table you have to move one by one table because details of those tables will be stored in innodb shared table space. Moving folder cannot work. Thanks, Saravanan --- On Fri, 12/11/09, Michael Dykman mdyk...@gmail.com wrote: From: Michael Dykman mdyk...@gmail.com Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? To: MySql mysql@lists.mysql.com Date: Friday, December 11, 2009, 10:54 PM No, not a loophole. Just a plain-old management feature.. there is nothing particularly hacky about it.. this is not trying to leverage undocumented features: this has been a published part of the API for at least a couple of years. On the same file system, yes it should be pretty damned fast. Depending on how your data is stored, it might now be 'quite' as simple as a unix 'mv' command.. if this is a production system, I would recommend you do a dry run with a replicant/slave. No amount of theorizing will tell as much as the experiment. - michael dykman On Fri, Dec 11, 2009 at 4:40 PM, Daevid Vincent dae...@daevid.com wrote: Will this work in 5.0? If I'm reading this right, it seems like this is some kind of trick or loophole then right? If it works and solves my dilemna, I'm fine with that, but I'm just curious. How fast is this? I mean, if I have an 80GB database, is it like a real unix 'mv' command where it simply changing pointers or is it a full on copy/rm? (Assume same filesystem/directory) -Original Message- From: Michael Dykman [mailto:mdyk...@gmail.com] Sent: Friday, December 11, 2009 6:08 AM To: MySql Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? If you want to move the database atomically, a RENAME TABLE statement may have multiple clauses. RENAME TABLE olddb.foo to newdb.foo, olddb.bar to newdb.bar; Here, I hot-swap a new lookup table 'active.geo' into a live system confident that, at any given point, some version of this table always exists: RENAME TABLE active.geo to archive.geo, standby.geo to active geo; - michael dykman On Fri, Dec 11, 2009 at 8:58 AM, Johan De Meersman vegiv...@tuxera.be wrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=dae...@daevid.com -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=suzuki_b...@yahoo.com This message contains confidential information and is intended only for the individual named. If you are not the named addressee, you are notified that reviewing, disseminating, disclosing, copying or distributing this e-mail is strictly prohibited. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any loss or damage caused by viruses or errors or omissions in the contents of this message, which arise as a result of e-mail transmission. [FriendFinder Networks, Inc., 220 Humbolt court, Sunnyvale, CA 94089, USA, FriendFinder.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
RE: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
In our case, we purposely avoid using any of those features. Just straight up INNODB tables. Permissions would be an issue, but in my case, I have a new dump of a database that I want to 'swap' with the existing one. A simple rename old, rename new to old would have solved it. Hence this thread. :) Therefore permissions should be fine as they go by DB name AFAIK and not some pointer. -Original Message- From: Gavin Towey [mailto:gto...@ffn.com] Sent: Friday, December 11, 2009 2:18 PM To: Saravanan; MySql; Michael Dykman Subject: RE: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? Don't forget triggers, stored routines, views, database/table specific user permissions, and replication/binlog options! Regards, Gavin Towey -Original Message- From: Saravanan [mailto:suzuki_b...@yahoo.com] Sent: Friday, December 11, 2009 2:02 PM To: MySql; Michael Dykman Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? if you have myisam alone tables you can rename the folder of the database. That can work like rename database. If you have innodb table you have to move one by one table because details of those tables will be stored in innodb shared table space. Moving folder cannot work. Thanks, Saravanan --- On Fri, 12/11/09, Michael Dykman mdyk...@gmail.com wrote: From: Michael Dykman mdyk...@gmail.com Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? To: MySql mysql@lists.mysql.com Date: Friday, December 11, 2009, 10:54 PM No, not a loophole. Just a plain-old management feature.. there is nothing particularly hacky about it.. this is not trying to leverage undocumented features: this has been a published part of the API for at least a couple of years. On the same file system, yes it should be pretty damned fast. Depending on how your data is stored, it might now be 'quite' as simple as a unix 'mv' command.. if this is a production system, I would recommend you do a dry run with a replicant/slave. No amount of theorizing will tell as much as the experiment. - michael dykman On Fri, Dec 11, 2009 at 4:40 PM, Daevid Vincent dae...@daevid.com wrote: Will this work in 5.0? If I'm reading this right, it seems like this is some kind of trick or loophole then right? If it works and solves my dilemna, I'm fine with that, but I'm just curious. How fast is this? I mean, if I have an 80GB database, is it like a real unix 'mv' command where it simply changing pointers or is it a full on copy/rm? (Assume same filesystem/directory) -Original Message- From: Michael Dykman [mailto:mdyk...@gmail.com] Sent: Friday, December 11, 2009 6:08 AM To: MySql Subject: Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE? If you want to move the database atomically, a RENAME TABLE statement may have multiple clauses. RENAME TABLE olddb.foo to newdb.foo, olddb.bar to newdb.bar; Here, I hot-swap a new lookup table 'active.geo' into a live system confident that, at any given point, some version of this table always exists: RENAME TABLE active.geo to archive.geo, standby.geo to active geo; - michael dykman On Fri, Dec 11, 2009 at 8:58 AM, Johan De Meersman vegiv...@tuxera.be wrote: On Fri, Dec 11, 2009 at 1:56 PM, Ken D'Ambrosio k...@jots.org wrote: rename table oldschema.table to newschema.table; Just to be 100% clear -- I assume you have to first create the destination database, and then do this for all the tables in the source database? Yep. Easily scriptable, though :-) -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=dae...@daevid.com -- - michael dykman - mdyk...@gmail.com May you live every day of your life. Jonathan Swift Larry's First Law of Language Redesign: Everyone wants the colon. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=suzuki_b...@yahoo.com This message contains confidential information and is intended only for the individual named. If you are not the named addressee, you are notified that reviewing, disseminating, disclosing, copying or distributing this e-mail is strictly prohibited. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender
Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
How can it possibly be that mySQL doesn't allow you to rename a database? I can't fathom how this can be a difficult task at all to do. Aren't mySQL databases stored in a directory of the DB name? And for INNODB, can't you just find the spot in the ibdata file and alter whatever needs to be changed? This is absolutely absurd. Not even 5.1 has this most basic of features. We have nearly a billion rows. Exporting to a .sql file and importing again can take nearly a week to do (3 days each way and that doesn't even begin to touch on the fact the server would be down)! WTF!? We're running Ubuntu LTS 8.04 w/ Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2 Even the manual for 5.1 says this can lose data: http://dev.mysql.com/doc/refman/5.1/en/rename-database.html This statement was added in MySQL 5.1.7 but was found to be dangerous and was removed in MySQL 5.1.23...However, use of this statement could result in loss of database contents, which is why it was removed. Do not use RENAME DATABASE in earlier versions in which it is present. Seriously? Please explain why a simple rename of a database is such a daunting task to mySQL/Sun that all their brilliant minds can't figure this one out? Why isn't there even a bug report for this? http://bugs.mysql.com/search.php?search_for=rename+databaseboolean=onstat us[]=Activeseverity=limit=Allorder_by=cmd=displayphpver=os=0os_detai ls=bug_age=0tags=similar=target=defect_class=allworkaround_viability= allimpact=allfix_risk=allfix_effort=alltriageneeded= -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Are you serious? mySQL 5.0 does NOT have a RENAME DATABASE?
Uhhh... wow. Unless I'm very, very, very mistaken, I think you're missing something pretty obvious: I believe you can simply a) shut down the database b) mv the directory to a different directory name. *DONE* Your database now has a different name. Boy, that 30 seconds of hard labor was sure faster than waiting a week for SQL dumps. Granted, I can't swear that this is Officially Sanctioned And Approved(tm), but I've done it many times, myself (and, indeed, just verified it under 5.1 to be sure it still worked). Since you are talking such a significant volume of data, I would suggest either testing, or hearing from someone more knowledgeable than I, but I think this problem is substantially smaller than you've let yourself believe. -Ken On Thu, December 10, 2009 11:35 pm, Daevid Vincent wrote: How can it possibly be that mySQL doesn't allow you to rename a database? I can't fathom how this can be a difficult task at all to do. Aren't mySQL databases stored in a directory of the DB name? And for INNODB, can't you just find the spot in the ibdata file and alter whatever needs to be changed? This is absolutely absurd. Not even 5.1 has this most basic of features. We have nearly a billion rows. Exporting to a .sql file and importing again can take nearly a week to do (3 days each way and that doesn't even begin to touch on the fact the server would be down)! WTF!? We're running Ubuntu LTS 8.04 w/ Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2 Even the manual for 5.1 says this can lose data: http://dev.mysql.com/doc/refman/5.1/en/rename-database.html This statement was added in MySQL 5.1.7 but was found to be dangerous and was removed in MySQL 5.1.23...However, use of this statement could result in loss of database contents, which is why it was removed. Do not use RENAME DATABASE in earlier versions in which it is present. Seriously? Please explain why a simple rename of a database is such a daunting task to mySQL/Sun that all their brilliant minds can't figure this one out? Why isn't there even a bug report for this? http://bugs.mysql.com/search.php?search_for=rename+databaseboolean=onst at us[]=Activeseverity=limit=Allorder_by=cmd=displayphpver=os=0os_det ai ls=bug_age=0tags=similar=target=defect_class=allworkaround_viabilit y= allimpact=allfix_risk=allfix_effort=alltriageneeded= -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=...@jots.org -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
