Re: InnoDB and rsync
On Wed, Jan 26, 2011 at 6:58 AM, Robinson, Eric eric.robin...@psmnv.comwrote: You need to quiesce the InnoDb background threads. One technique is mentioned here: http://dev.mysql.com/doc/refman/5.5/en/innodb-multiple-tablesp aces.html Look for the section talking about clean backups. Now we're talkin. I'll check it out. I read that section but it is not at all clear (1) how one quiesces the InnoDB background threads, or (2) if there is a way to keep them quiesced while the backup is in progress. From what I see there: You can make a clean backup .ibd file using the following method: 1. Stop all activity from the *mysqld*http://dev.mysql.com/doc/refman/5.5/en/mysqld.htmlserver and commit all transactions. 2. Wait until SHOW ENGINE INNODB STATUShttp://dev.mysql.com/doc/refman/5.5/en/show-engine.htmlshows that there are no active transactions in the database, and the main thread status of InnoDB is Waiting for server activity. Then you can make a copy of the .ibd file. I would assume that flush tables with read lock would work for 1. and then you wait for 2. to happen. Probably shouldn't take very long, especially in the quiet moments. -- Bier met grenadyn Is als mosterd by den wyn Sy die't drinkt, is eene kwezel Hy die't drinkt, is ras een ezel
RE: InnoDB and rsync
You need to quiesce the InnoDb background threads. One technique is mentioned here: http://dev.mysql.com/doc/refman/5.5/en/innodb-multiple-tablesp http://dev.mysql.com/doc/refman/5.5/en/innodb-multiple-tablesp aces.html Look for the section talking about clean backups. Now we're talkin. I'll check it out. I read that section but it is not at all clear (1) how one quiesces the InnoDB background threads, or (2) if there is a way to keep them quiesced while the backup is in progress. From what I see there: You can make a clean backup .ibd file using the following method: 1. Stop all activity from the mysqld http://dev.mysql.com/doc/refman/5.5/en/mysqld.html server and commit all transactions. 2. Wait until SHOW ENGINE INNODB STATUS http://dev.mysql.com/doc/refman/5.5/en/show-engine.html shows that there are no active transactions in the database, and the main thread status of InnoDB is Waiting for server activity. Then you can make a copy of the .ibd file. I would assume that flush tables with read lock would work for 1. and then you wait for 2. to happen. Probably shouldn't take very long, especially in the quiet moments. Can anyone confirm that FLUSH TABLES WITH READ LOCK is sufficient to quiesce the InnoDB background threads? When Googling this, I'm seeing posts saying that even after a flush lock, InnoDB keeps making changes to certain files (metadata?) and that's why it is never really safe (according to them) to copy the files from a running instance of MySQL. Call me persistent (or just annoyingly thick-headed) but I am not fully satisfied their explanations. --Eric Disclaimer - January 26, 2011 This email and any files transmitted with it are confidential and intended solely for Johan De Meersman,Shawn Green (MySQL),Reindl Harald,mysql@lists.mysql.com. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physicians' Managed Care or Physician Select Management. Warning: Although Physicians' Managed Care or Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments. This disclaimer was added by Policy Patrol: http://www.policypatrol.com/
[ANN] ODB C++ ORM 1.1.0 released
Hi,
I am pleased to announce the release of ODB 1.1.0.
ODB is an open-source object-relational mapping (ORM) system for C++. It
allows you to persist C++ objects to a relational database without having
to deal with tables, columns, or SQL and without manually writing any of
the mapping code.
Major new features in this release:
* Support for storing containers in the database, for example:
#pragma db object
class person
{
...
std::setstd::string emails_;
};
* Support for unidirectional and bidirectional object relationships,
including lazy loading. For example:
#pragma db object
class employer
{
...
#pragma db inverse(employer_)
std::vectorlazy_weak_ptremployee employees_;
};
#pragma db object
class employee
{
...
shared_ptremployer employer_;
};
* Support for composite value types, for example:
#pragma db value
class name
{
...
std::string first_;
std::string last_;
};
#pragma db object
class person
{
...
name name_;
};
* Support for optional object cache (session).
* Support for native SQL statement execution.
* Support for customization of object pointers that allows you to
use smart pointers to return, pass, and cache persistent objects.
A more detailed discussion of the major new features can be found in
the following blog post:
http://www.codesynthesis.com/~boris/blog/2011/01/26/odb-1-1-0-released/
For the complete list of new features in this version see the official
release announcement:
http://www.codesynthesis.com/pipermail/odb-announcements/2011/01.html
ODB is written in portable C++ and you should be able to use it with any
modern C++ compiler. In particular, we have tested this release on GNU/Linux
(x86/x86-64), Windows (x86/x86-64), Mac OS X, and Solaris (x86/x86-64/SPARC)
with GNU g++ 4.2.x-4.5.x, MS Visual C++ 2008 and 2010, and Sun Studio 12.
More information, documentation, source code, and pre-compiled binaries are
available from:
http://www.codesynthesis.com/products/odb/
Enjoy,
Boris
--
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Data in Table Is Different When Seen From Different Sources
I'm having the strangest issue. I am using a Perl program to test out some other Perl programs and all the Perl connections with MySQL are normal, as in I use the standard interface. But in the test program I'm just using this: $out = `mysql --table -eSELECT * FROM search.Status`; print $out\n; as a quick and dirty way to check on the data tables while I'm working. This test program gives this output: +++---+---+--++-+--+---+ | Source | Search | Stage | Status| Resource | TotalItems | CurrentItem | CheckIn | PID | +++---+---+--++-+--+---+ | alpha | one| 3 | waiting |1 | -1 | -1 | 2011-0126-160720 | 0 | | alpha | two| 1 | searching | 201 | -1 | -1 | 2011-0126-160115 | 12331 | +++---+---+--++-+--+---+ I have two items in the first row that are my concern, the first is in the column Status, the 2nd is in the column PID. These are updated. Also, this program is a loop and after it displayed this table, I locked the screen with ctrl-q (in a BASH shell using Konsole on OS X with MacPorts). (Also, this system is a VM, under parallels, on another Mac and I'm using ssh to connect to that system to run all these commands.) But when I go to the console where I've logged into MySQL and display this table, I get: mysql SELECT * FROM search.Status; +++---+---+--++-+--+---+ | Source | Search | Stage | Status| Resource | TotalItems | CurrentItem | CheckIn | PID | +++---+---+--++-+--+---+ | alpha | one| 3 | searching |1 | -1 | -1 | 2011-0126-160120 | 12336 | | alpha | two| 1 | searching | 201 | -1 | -1 | 2011-0126-160115 | 12331 | +++---+---+--++-+--+---+ 2 rows in set (0.00 sec) When I go to a command line and cut and paste the command from in the program, I get this: hal@tnet-search:threshNet]$ mysql --table -eSELECT * FROM search.Status +++---+---+--++-+--+---+ | Source | Search | Stage | Status| Resource | TotalItems | CurrentItem | CheckIn | PID | +++---+---+--++-+--+---+ | alpha | one| 3 | searching |1 | -1 | -1 | 2011-0126-155546 | 12294 | | alpha | two| 1 | searching | 201 | -1 | -1 | 2011-0126-155545 | 12289 | +++---+---+--++-+--+---+ So I'm checking this data table from THREE sources, from within MySQL, from the command line, and from within the Perl program. How can I get different values in two cells in the table? Is there some kind of buffering along the way that could effect the output to the Perl program? Thanks for any ideas on this! Hal -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Data in Table Is Different When Seen From Different Sources
Hal Vaughan h...@halblog.com wrote: I'm having the strangest issue. I am using a Perl program to test out some other Perl programs and all the Perl connections with MySQL are normal, as in I use the standard interface. But in the test program I'm just using this: [... cut ...] Transaction isolation level? Add a timestamp column showing last update and then compare values. Regards, m - Sprawdz pogode. Kliknij http://linkint.pl/f2903 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Data in Table Is Different When Seen From Different Sources
On Jan 26, 2011, at 5:11 PM, mis...@poczta.fm wrote: Hal Vaughan h...@halblog.com wrote: I'm having the strangest issue. I am using a Perl program to test out some other Perl programs and all the Perl connections with MySQL are normal, as in I use the standard interface. But in the test program I'm just using this: [... cut ...] Transaction isolation level? Add a timestamp column showing last update and then compare values. Thanks, actually, after sending that, I put in more time fields (since I would need them anyway) and that led me to finally finding a rogue process that was being forked in Perl, and finishing up fast enough that I didn't see it when I tried ps -ax. So it's solved now -- rogue process. Thanks! Hal -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
