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Sympa and its database

Sympa requires a RDBMS to run. Currently you can use one of the following RDBMS: MySQL (version 4.1 minimum), SQLite, PostgreSQL, Oracle, Sybase. Interfacing with other RDBMS requires only a few changes in the code, since the API used, DBI (DataBase Interface), has DBD (DataBase Drivers) for many RDBMS.

Sympa's use of the database and the schema are described in the Internals Document Database Section.

Prerequisites

You need to have a DataBase System installed (not necessarily on the same host as Sympa), and the client libraries for that Database installed on the Sympa host; provided, of course, that a PERL DBD (DataBase Driver) is available for the RDBMS you chose! Check the ''DBI'' Module Availability.

Installing PERL modules

Sympa will use DBI to communicate with the database system and therefore requires the DBD for your database system. DBI and DBD::YourDB (Msql-Mysql-modules for MySQL) are distributed as CPAN modules. Refer to Installing PERL and CPAN modules for installation details of these modules.

Creating a Sympa DataBase

Database structure

The Sympa database structure is slightly different from the structure of a subscribers file. A subscribers file is a text file based on paragraphs (similar to the config file); each paragraph completely describes a subscriber. If somebody is subscribed to two lists, he/she will appear in both subscribers files.

The DataBase distinguishes between information relating to a person (email, real name, password) and his/her subscription options (list concerned, date of subscription, delivery mode, visibility option). This results in a separation of the data into two tables : the user_table and the subscriber_table, linked by a user/subscriber email.

The table concerning owners and editors, the admin_table, is built on the same model as the subscriber_table. It contains owner and editor options (list concerned, administrative role, date of “subscription”, delivery mode, private information, gecos and profile option for owners).

Database automatic creation and update

At startup, the sympa.pl process will check if the database (configured in sympa;conf) is available and if it has the expected structure. If not, sympa.pl process will create the database or update its structure for you. Note however that this feature is available with mysql and SQLite only, integration for other RDBMS is less complete. Note that this automated process requires that the mysql root does not use a password ; if it does, disable it before you run sympa.pl for the first time.

The automatic procedure will also grant privileges to the db_user you've declared in sympa.conf.

Database manual creation

The create_db script below will create the Sympa database for you. You can find it in the script/ directory of the distribution (currently scripts are available for MySQL, SQLite, PostgreSQL, Oracle and Sybase).

  • MySQL database creation script:

  • SQLite database creation script:

  • PostgreSQL database creation script:

  • Sybase database creation script:

  • Oracle database creation script:

You can execute the script using a simple SQL shell such as mysql, psql or sqlplus.

MySQL Example:

# mysql  < create_db.mysql

Postgresql Example: it may require you to manually create the database first.

CREATE ROLE sympa NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT NOLOGIN;
CREATE ROLE sympa NOSUPERUSER NOCREATEDB NOCREATEROLE NOINHERIT
LOGIN ENCRYPTED PASSWORD '{password}';
GRANT sympa TO sympa;
CREATE DATABASE sympa WITH OWNER=sympa;
psql -U sympa -d sympa < /home/sympa/bin/create_db.Pg

Setting database privileges

We strongly recommend that you restrict access to the Sympa database. You will then set db_user and db_passwd in sympa.conf.

With MySQL:

grant all on sympa.* to sympa@localhost identified by 'your_password';
  flush privileges;

Required tunning of database

Starting with version 6.0, Sympa store messages in database. Because of this feature, it is required that the database accept records as big as messages are. This can be done by tunning the MySQL parameter 'max_allowed_packet' in mysql configuration file my.cnf. A raisonnable value is 32M. Ones this done and Sympa is installed, you can test the maximum message size that Sympa can handle with the following command line :

sympa.pl --test_database_message_buffer

Other data base systems supported by Sympa may require also so tunning for the same reason.

Importing subscriber data

Importing data from a text file

You can import subscribtion data into the database from a text file having one entry per line: the first field is an email address, the second (optional) field is the free form name. Fields are space-separated.

Example:

  ## Data to be imported
  ## email        gecos
  john.steward@some.company.com           John - accountant
  mary.blacksmith@another.company.com     Mary - secretary

To import data into the database:

cat /tmp/my_import_file | sympa.pl --import=my_list

(see sympa.pl).

Importing data from subscribers files

If a mailing list was previously set up to store subscribers into a subscribers file (the default mode in versions older then 2.2b), you can load subscriber data into the Sympa database. The easiest way is to edit the list configuration using WWSympa (this requires listmaster privileges) and change the data source from file to database; subscriber data will be loaded into the database at the same time.

If the subscribers file is large, a timeout may occur during the FastCGI execution (note that you can set a longer timeout with the -idle-timeout option of the FastCgiServer Apache configuration directive). In this case, or if you have not installed WWSympa, you should use the load_subscribers.pl script.

Extending database table format

You can easily add other fields to the three tables, they will not disturb Sympa because it lists explicitly the field it expects in SELECT queries.

Moreover, you can access these database fields from within Sympa (in templates), as far as you list these additional fields in sympa.conf (see db_additional_subscriber_fields and db_additional_user_fields).

Sympa logs in the database

The logs_table database table has been introduced with release 5.3 of Sympa. This DB table gathers some kind of logs/journals that Sympa want to keep track of. Only events that changes Sympa's state are logged ; this includes member subscription/removal, message distribution/moderation, bounces handling, user authentication on the web interface. The content of the database can then be searched by list owners ; privacy is enforced to prevent a list owner to access information from other lists.

The logs_table table is purged to prevent DB size to diverge. The retention period of log entries is defined by the logs_expiration_period parameter

Below is a description of each field of the logs_table table :

  • id_logs: primary key for the table.
  • date_logs: epoch date representing the time when the action was performed.
  • robot_logs: the robot the action relates to. It may be empty if no specific virtual host is concerned.
  • list_logs: the list the action refers to. It may be undefined if the action does not refer to a specific list (like authentication related actions).
  • action_logs: an identifier for the action performed. Each action belongs to a group of actions (authentication related, subscription related, etc). The list of actions and the group they relate to is defined in the Log.pm perl module.
  • parameters_logs: parameters of the action. It is an optional comma-separated list of parameters.
  • user_email_logs: this field tells who is performing the action, if authenticated.
  • target_email_logs: this parameter represents the email address that is mainly concerned by the action ; it may be empty. If a list owner adds a new member to his list, the target_email_logs field will contain the new member email address.
  • client_logs: IP address of the user performing the action, may be empty if action is performed via the mail interface.
  • msg_id_logs: Message-ID of the message, if the action applies to a message.
  • status_logs: the status of the action ; it will contain one of the following values : success, error.
  • error_type_logs: If the action failed, this field an error identifier representing the error.
  • daemon_logs: tells which process has performed the action. It may be one of bounced, sympa, wwsympa

Sympa configuration

To store subscriber information in your newly created database, you first need to tell Sympa what kind of database to work with, then you must configure your list to access the database.

You'll need to tell Sympa where its database is located through the related sympa.conf parameters : db_type, db_name, db_host, db_user, db_passwd.

If you are interfacing Sympa with an Oracle database, note that :

  1. the db_name corresponds to the Oracle SID.
  2. you'll need to set the ORACLE_HOME environment variable through the db_env sympa.conf parameter

All your lists are now configured to use the database, unless you set the list parameter user_data_source to file or include.

Sympa will now extract and store user information for this list using the database instead of the subscribers file. Note however that subscriber information is dumped to subscribers.db.dump at every shutdown, to allow a manual rescue restart (by renaming subscribers.db.dump to subscribers and changing the user_data_source parameter), in case the database were to become inaccessible. FIXME - Is this still true?

manual_6.0/database.txt · Last modified: 2011/02/11 14:22 (external edit)

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