maria-developers team mailing list archive

[Lixun Peng <penglixun@xxxxxxxxx>]

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.
>
>
> Thanks,
> Lixun
>
> --
> Senior MySQL Developer @ Taobao.com
>
> Mobile Phone: +86 18658156856 (Hangzhou)
> Gtalk: penglixun(at)gmail.com
> Twitter: http://www.twitter.com/plinux
> Blog: http://www.penglixun.com
>



-- 
Senior MySQL Developer @ Taobao.com

Mobile Phone: +86 18658156856 (Hangzhou)
Gtalk: penglixun(at)gmail.com
Twitter: http://www.twitter.com/plinux
Blog: http://www.penglixun.com