Manual:$wgDBservers

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ロードバランサーの設定: $wgDBservers
データベースのロードバランサーの設定 (データベースサーバーとロード率)。
導入されたバージョン:	1.2.0
除去されたバージョン:	使用中
許容される値:	下記参照
既定値:	`false`
その他の設定: アルファベット順 \| 機能順

詳細

Since MediaWiki 1.18 (Release notes) the database user for all databases configured in this array (if you use replication) needs the REPLICATION CLIENT privilege to determine the lag between primary <-> replica.

データベースのロードバランサー。 This is a two-dimensional array, an array of server info structures. Fields are:

host: ホスト名 ($wgDBserver を参照)。 For MySQL, it can contain a port or socket path after a colon.
dbname: 既定のデータベース名 ($wgDBname を参照)
user: データベースのユーザー ($wgDBuser を参照)
password: データベースのパスワード ($wgDBpassword を参照)
type: "mysql" または "postgres" ($wgDBtype を参照)
load: ratio of DB_REPLICA load, must be >=0, the sum of all loads must be >0
groupLoads: array of load ratios, the key is the query group name. A query may belong to several groups, the most specific group defined here is used. (1.4.3 で導入)

max lag: (optional) Maximum replication lag before a replica will be taken out of rotation
max threads: (optional) Maximum number of running threads (1.23 で除去)

flags

ビットフィールド:

DBO_DEFAULT — turns on DBO_TRX only if $wgCommandLineMode != true (recommended)
DBO_DEBUG — equivalent of $wgDebugDumpSql
DBO_TRX — automatically start transactions (see データベースのトランザクション )
DBO_IGNORE — ignore errors (not useful in LocalSettings.php)
DBO_NOBUFFER — turn off buffering (not useful in LocalSettings.php)
DBO_SSL — use a secure connection (1.39 で廃止予定)
DBO_COMPRESS — compress communication
DBO_PERSISTENT — enable persistent connections

ssl (1.39 で導入): Boolean, whether to use TLS encryption. Overrides DBO_SSL.

Leave at false to use the single-server variables listed above.

The primary must be the first entry in the array.

例 1:

$wgDBservers = [
    [
        'host' => "primary.serv.er",
        'dbname' => "wikidb",
        'user' => "wikiuser",
        'password' => "secret",
        'type' => "mysql",
        'flags' => DBO_DEFAULT,
        'load' => 0,
    ],
    [
        'host' => "replica1.serv.er",
        'dbname' => "wikidb",
        'user' => "wikiuser",
        'password' => "secret",
        'type' => "mysql",
        'flags' => DBO_DEFAULT,
        'load' => 1,
    ],
    [
        'host' => "replica2.serv.er",
        'dbname' => "wikidb",
        'user' => "wikiuser",
        'password' => "secret",
        'type' => "mysql",
        'flags' => DBO_DEFAULT,
        'load' => 1,
    ],
];

This would configure one primary and two replicas, each replica getting an equal amount of read access load.

Example 2:

$wgDBservers = [
    [
        'host' => 'serv.er',
        'dbname' => 'wikidb',
        'user' => 'wikiuser',
        'password' => 'secret',
        'type' => 'mysql',
        'flags' => DBO_DEFAULT | DBO_SSL,
        'load' => 0
    ]
];

This would configure one server with custom SSL connection if $wgDBssl set to true fails.

These and any other user-defined properties will be assigned to the mLBInfo member variable of the Database object.

MySQL specific options

lagDetectionMethod: Set to one of (Seconds_Behind_Master,pt-heartbeat). pt-heartbeat assumes the table is at heartbeat.heartbeat and uses UTC timestamps in the heartbeat.ts column. (https://www.percona.com/doc/percona-toolkit/2.2/pt-heartbeat.html)
lagDetectionOptions: If using pt-heartbeat, this can be set to an array map to change the default behavior. Normally, the heartbeat row with the server ID of this server's primary will be used. Set the "conds" field to override the query conditions, e.g. ['shard' => 's1'].
useGTIDs: Use GTID methods like MASTER_GTID_WAIT() when possible.
sslKeyPath: Path to key file.
sslCertPath: Path to certificate file.
sslCAFile: Path to a single certificate authority PEM file. (1.30+ で導入)
sslCAPath: Path to certificate authority PEM directory.
sslCiphers: Array list of allowable ciphers.

PostgreSQL specific options

port: Port to connect to the server.
keywordTableMap: Map of reserved table names to alternative table names to use

SQLite specific options

dbFilePath: Path to the database file.
dbDirectory: Path to the directory containing the database file. Only needed if dbFilePath is not specified, and requires dbname.
dbname: Name of the database (without the .sqlite extension). Only needed if dbFilePath is not specified, and requires dbDirectory.
trxMode: Transaction mode. One of DEFERRED, IMMEDIATE or EXCLUSIVE.

MSSQL specific options

Note that MSSQL is no longer supported starting with MediaWiki 1.34.

port: Port to connect to the server.
UseWindowsAuth: Use Integrated Windows Authentication for authentication to the database instead of username/password.

Important notes

If you switch to this, ensure you either keep $wgDBname 、$wgDBprefix および $wgDBTableOptions set, or ensure $wgCookiePrefix および $wgCachePrefix are set explicitly. Note also that if you only connect to one database server the load parameter needs to be set to 0.