maria-developers team mailing list archive

[Sergei Golubchik <serg@xxxxxxxxxxxx>]

Hi, Lixun!

Great, thanks!
I'll look at it as soon as possible.

On Apr 06, Lixun Peng wrote:
> Hi all,
> 
> I pushed my patch to
> http://bazaar.launchpad.net/~maria-captains/maria/10.0-flashback/revision/3510
> 
> Compare with the pre-patch, I modified the exchange_update_rows() function,
> it will revert the rows in one update event, too.
> 
> 
> On Wed, Mar 27, 2013 at 3:38 PM, Lixun Peng <penglixun@xxxxxxxxx> wrote:
> 
> > Hi Monty,
> >
> > I patched my flashback feature to 10.0-base, and this is the diff
> > file, please help me to review it.
> >
> > How to use this feature?
> > I added several new arguments for mysqlbinlog:
> > --flashback (-B), it will let mysqlbinlog working on FLASHBACK mode.
> > --table (-T), it likes -d, but this argument is for table.
> > --review, it will le mysqlbinlog print the SQL for reviewing.
> > Reviewing feature will create a new "review" table to record the data
> > that will be changed by FLASHBACK feature. If you aren't special the
> > --review-dbname/tablename, "review" table will created on current DB,
> > and the table name will be "__"+original_table_name. And for getting
> > the original table struct, mysqlbinlog need to connect mysql, so
> > --user/--host/--password is needed if necessary.
> > --review-dbname, the DB that you want to store the review table.
> > --review-tablename the TABLE that you want to store the changed data.
> > Only if you set -T, this argument is useful.
> >
> > For example:
> > I have a table "t" in database "test",
> > CREATE TABLE `t` (
> >   `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
> >   `info` varchar(32) DEFAULT NULL,
> >   PRIMARY KEY (`id`)
> > ) ENGINE=InnoDB AUTO_INCREMENT=9043880 DEFAULT CHARSET=utf8;
> >
> > And I done this operation,
> > root@localhost : (none) 14:52:50> reset master;
> > root@localhost : (none) 14:53:02> use test
> > root@localhost : test 14:53:08> delete from t limit 10;
> > root@localhost : test 14:53:25> insert into t (info) select "你好";
> > root@localhost : test 14:54:01> update t set info ='hello你好' limit 5;
> >
> > We can compare the output with --flashback or not.
> > #client/mysqlbinlog /data/mysqldata_10.0/binlog/mysql-bin.000001 -vv -d test -T t --start-datetime="2013-03-27 14:54:00"  > /tmp/1.sql
> > #client/mysqlbinlog /data/mysqldata_10.0/binlog/mysql-bin.000001 -vv -uroot -d test -T t --start-datetime="2013-03-27 14:54:00" -B --review > /tmp/2.sql
> >
> > How to implement Flashback:
> > 1. mysqlbinlog tool can parse the binlog files and print them, so we
> > can use the most of code in mysqlbinlog.
> > 2. Changing the event type (INSERT -> DELETE, DELETE -> INSERT)
> > 3. Exchanging the SET/WHERE part in UPDATE (UPDATE table SET x=1 WHERE
> > y=2 -> UPDATE table SET y=2 WHERE x=1)
> > 4. Invert the event output, from end to beginning (binlog: e1,e2,e3...
> > -> flashback_log: en...e3,e2,e1)
> >
> > Then, importing the flashback output can flashback database/table to
> > the special time.
> > But binlog_format should be ROW.

Regards,
Sergei