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MySQL schema maintenance
Giuseppe MaxiaMySQL Community Team Lead
This work is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported License.
Thursday, 03 December 2009
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about me - Giuseppe Maxia a.k.a. The Data Charmer MySQL Community Team Lead Long time MySQL hacker Formerly, database consultant, designer, coder. A passion for QA An even greater passion for open source ... and community Passionate blogger http://datacharmer.blogspot.com
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Schema what?
In a relational database, the schema defines the tables, the fields in each table, and the relationships between fields and tables.
http://en.wikipedia.org/wiki/Schema_(database)
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tables
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tables
table nametable nametable name
column column column
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tables
table nametable nametable name
column column column
CREATE TABLE employees ( ID INT NOT NULL, name VARCHAR(20), salary INT, PRIMARY KEY (ID))
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
departmentsdepartments
ID INT
name varchar (10)
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
departmentsdepartments
ID INT
name varchar (10)
1
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
departmentsdepartments
ID INT
name varchar (10)
1many
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
salessales
cust_ID INT
emp_ID INT
s_date DATE
amount DECIMAL
customercustomer
ID INT
name varchar (10)
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
salessales
cust_ID INT
emp_ID INT
s_date DATE
amount DECIMAL
customercustomer
ID INT
name varchar (10)
11
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
salessales
cust_ID INT
emp_ID INT
s_date DATE
amount DECIMAL
customercustomer
ID INT
name varchar (10)
manymany
11
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relationship
employeesemployees
ID INT
name varchar (10)
salary INT
dept_ID INT
salessales
cust_ID INT
emp_ID INT
s_date DATE
amount DECIMAL
customercustomer
ID INT
name varchar (10)
manymany
11
many to many
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Main actors
• Production
• Development
• Stage
• Test
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Production database
• You must have one
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Development database
• Where you create new thingsThursday, 03 December 2009
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Test database
• Where you experiment crazy ideas
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Stage database
• Where you test before deploying to production
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Schema maintenance actions
• Reverse engineering
• Forward engineering
• Synchronization
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Reverse Engineering
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Reverse Engineering
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
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Reverse Engineering
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
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Reverse Engineering
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
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Forward Engineering
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Forward Engineering
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Forward Engineering
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Forward Engineering
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
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Forward Engineering
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
WARNING!
Forward engineerin
g is destr
uctive.
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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Synchronization
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How it works
Production
StageTest
Development
OK?
no
yes
OK?yes
no
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How else it works
Production
StageTest
Development
• Partition adjustment
• Dynamic schemas
• Hot fixes
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What happens in between
Test
Development
OK?
no
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What happens in between
Test
Development
OK?
no What now?
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What happens in between
Test
Development
OK?
no What now? Wrong schema here
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What happens in between
Test
Development
OK?
no What now? Wrong schema here
REWIND?
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Schema maintenance: how to
1. Poor man's wayThursday, 03 December 2009
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How poor is the poor man?• only command line access• No Perl, PHP, or Python• Can't install anything
• Command line access• Perl or Python available• Can install modules
• Command line access• GUI• Can install everything
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How poor is the poor man?• only command line access• No Perl, PHP, or Python• Can't install anything
• Command line access• Perl or Python available• Can install modules
• Command line access• GUI• Can install everything
EXTREMELY
POOR
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How poor is the poor man?• only command line access• No Perl, PHP, or Python• Can't install anything
• Command line access• Perl or Python available• Can install modules
• Command line access• GUI• Can install everything
POOR
EXTREMELY
POOR
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How poor is the poor man?• only command line access• No Perl, PHP, or Python• Can't install anything
• Command line access• Perl or Python available• Can install modules
• Command line access• GUI• Can install everything
POOR
EXTREMELY
POOR
RICH
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HOST 1
so, the extremely poor man's way ...
HOST 2
ProductionDevelopment
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HOST 1
so, the extremely poor man's way ...
get the schema
TEXT FILE
HOST 2
ProductionDevelopment
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HOST 1
so, the extremely poor man's way ...
get the schema
TEXT FILE
HOST 2
get the schema
TEXT FILE
ProductionDevelopment
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HOST 1
so, the extremely poor man's way ...
get the schema
TEXT FILE
HOST 2
get the schema
TEXT FILE
diff
ProductionDevelopment
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HOST 1
so, the extremely poor man's way ...
get the schema
TEXT FILE
HOST 2
get the schema
TEXT FILE
diff
ProductionDevelopment
then … uh … figure out how to continue
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HOST 1
the poor man's way ...HOST 2
ProductionDevelopment
Perl Script
get the schema
TEXT FILE
get the schema
TEXT FILE
diff
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HOST 1
the poor man's way ...HOST 2
ProductionDevelopment
Perl Script
get the schema
TEXT FILE
get the schema
TEXT FILE
diff
TELLS YOU WHAT TO DO
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HOST 1
not so poor man's way ...HOST 2
ProductionDevelopment
Python Script
DOES A LOT OF THINGS
http://schemasync.org
TELLS YOU WHAT TO DO
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HOST 1
not so poor man's way ...HOST 2
ProductionDevelopment
Python Script
DOES A LOT OF THINGS
http://schemasync.org
TELLS YOU WHAT TO DO
WARNING: doesn't deal with partitionsThursday, 03 December 2009
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The rich man
http://aquafold.com
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The rich man
http://aquafold.com
WARNING: doesn't deal with partitionsThursday, 03 December 2009
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MySQL Workbench
http://wb.mysql.com
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MySQL Workbench
http://wb.mysql.com
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MySQL Workbench
http://wb.mysql.com
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Schema and model
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Schema and model
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
Thursday, 03 December 2009
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Schema and model
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
Thursday, 03 December 2009
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Physical schema
implemented in a specific DBMS
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Physical schema
DDLdept_empdept_empdept_emp
departmentdepartmentdepartment
dept_managerdept_managerdept_manager
employeesemployeesemployees
titlestitlestitles
salariessalariessalaries
implemented in a specific DBMS
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Conceptual model
DBMS agnostic
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Conceptual model
DBMS agnostic
Thursday, 03 December 2009
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MySQL Workbench basics
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Creating tables (1)
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Creating tables (2)
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Creating tables (3)
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Creating tables (3)
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Creating tables (4)
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Creating tables (4)
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Creating tables (5)
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Creating tables (5)
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database connections(1)
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database connections(2)
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Reverse engineering in the old world
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Reverse engineering in the old world
show create table departments\G
Create Table: CREATE TABLE `departments`
(
`dept_id` int(10) unsigned NOT NULL,
`department` char(30) NOT NULL,
PRIMARY KEY (`dept_id`),
KEY `department` (`department`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
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Reverse engineering in the old world
show create table departments\G
Create Table: CREATE TABLE `departments`
(
`dept_id` int(10) unsigned NOT NULL,
`department` char(30) NOT NULL,
PRIMARY KEY (`dept_id`),
KEY `department` (`department`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
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Reverse engineering (1)
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Reverse engineering (2)
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Reverse engineering (3)
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Reverse engineering (4)
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Reverse engineering (5)
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Reverse engineering (6)
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Reverse engineering (7)
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Reverse engineering (8)
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Reverse engineering (9)
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Reverse engineering (10)
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forward engineering in the old world
mysqldump --host=development -B \
--no-data crosstab > crosstab.sql
mysql --host=stage < crosstab.sql
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Forward engineering (1)
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Forward engineering (2)
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Forward engineering (3)
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Forward engineering (4)
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synchronization in the old world
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Synchronization (1)
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Synchronization (1)
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Synchronization (2)
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Synchronization (3)
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Synchronization (4)
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Synchronization (5)
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Synchronization (6)
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More goodies
• MySQL Workbench 5.2 (Beta) - live demo
Thursday, 03 December 2009
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Thanks
Let's talk!
Thursday, 03 December 2009