85 lines
2.9 KiB
Markdown
85 lines
2.9 KiB
Markdown
# What is mydumper? Why?
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* Parallelism (hence, speed) and performance (avoids expensive character set conversion routines, efficient code overall)
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* Easier to manage output (separate files for tables, dump metadata, etc, easy to view/parse data)
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* Consistency - maintains snapshot across all threads, provides accurate master and slave log positions, etc
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* Manageability - supports PCRE for specifying database and tables inclusions and exclusions
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## How to install mydumper/myloader?
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First get the correct url from the [releases section](https://github.com/maxbube/mydumper/releases) then:
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### RedHat / Centos
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```bash
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yum install https://github.com/maxbube/mydumper/releases/download/v0.9.5/mydumper-0.9.5-1.el7.x86_64.rpm
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```
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### Ubuntu / Debian
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```bash
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wget https://github.com/maxbube/mydumper/releases/download/v0.9.5/mydumper_0.9.5-1.xenial_amd64.deb
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dpkg -i mydumper_0.9.5-1.xenial_amd64.deb
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```
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## How to build it?
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Run:
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```bash
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cmake .
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make
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```
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One needs to install development versions of required libaries (MySQL, GLib, ZLib, PCRE):
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NOTE: you must use the correspondent mysql devel package.
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* Ubuntu or Debian: apt-get install libglib2.0-dev libmysqlclient15-dev zlib1g-dev libpcre3-dev libssl-dev
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* Fedora, RedHat and CentOS: yum install glib2-devel mysql-devel zlib-devel pcre-devel openssl-devel
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* openSUSE: zypper install glib2-devel libmysqlclient-devel pcre-devel zlib-devel
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* MacOSX: port install glib2 mysql5 pcre pkgconfig cmake
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(You may want to run 'port select mysql mysql5' afterwards)
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One has to make sure, that pkg-config, mysql_config, pcre-config are all in $PATH
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Binlog dump is disabled by default to compile with it you need to add -DWITH_BINLOG=ON to cmake options
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To build against mysql libs < 5.7 you need to disable SSL adding -DWITH_SSL=OFF
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## How does consistent snapshot work?
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This is all done following best MySQL practices and traditions:
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* As a precaution, slow running queries on the server either abort the dump, or get killed
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* Global write lock is acquired ("FLUSH TABLES WITH READ LOCK")
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* Various metadata is read ("SHOW SLAVE STATUS","SHOW MASTER STATUS")
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* Other threads connect and establish snapshots ("START TRANSACTION WITH CONSISTENT SNAPSHOT")
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** On pre-4.1.8 it creates dummy InnoDB table, and reads from it.
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* Once all worker threads announce the snapshot establishment, master executes "UNLOCK TABLES" and starts queueing jobs.
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This for now does not provide consistent snapshots for non-transactional engines - support for that is expected in 0.2 :)
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## How to exclude (or include) databases?
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Once can use --regex functionality, for example not to dump mysql and test databases:
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```bash
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mydumper --regex '^(?!(mysql\.|test\.))'
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```
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To dump only mysql and test databases:
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```bash
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mydumper --regex '^(mysql\.|test\.)'
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```
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To not dump all databases starting with test:
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```bash
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mydumper --regex '^(?!(test))'
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```
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Of course, regex functionality can be used to describe pretty much any list of tables.
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