diff options
Diffstat (limited to 'oslo/db/options.py')
| -rw-r--r-- | oslo/db/options.py | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/oslo/db/options.py b/oslo/db/options.py index 72e626c..b056b1c 100644 --- a/oslo/db/options.py +++ b/oslo/db/options.py @@ -138,7 +138,53 @@ database_opts = [ def set_defaults(conf, connection=None, sqlite_db=None, max_pool_size=None, max_overflow=None, pool_timeout=None): - """Set defaults for configuration variables.""" + """Set defaults for configuration variables. + + Overrides default options values. + + :param conf: Config instance specified to set default options in it. Using + of instances instead of a global config object prevents conflicts between + options declaration. + :type conf: oslo.config.cfg.ConfigOpts instance. + + :keyword connection: SQL connection string. + Valid SQLite URL forms are: + * sqlite:///:memory: (or, sqlite://) + * sqlite:///relative/path/to/file.db + * sqlite:////absolute/path/to/file.db + :type connection: str + + :keyword sqlite_db: path to SQLite database file. + :type sqlite_db: str + + :keyword max_pool_size: maximum connections pool size. The size of the pool + to be maintained, defaults to 5, will be used if value of the parameter is + `None`. This is the largest number of connections that will be kept + persistently in the pool. Note that the pool begins with no connections; + once this number of connections is requested, that number of connections + will remain. + :type max_pool_size: int + :default max_pool_size: None + + :keyword max_overflow: The maximum overflow size of the pool. When the + number of checked-out connections reaches the size set in pool_size, + additional connections will be returned up to this limit. When those + additional connections are returned to the pool, they are disconnected and + discarded. It follows then that the total number of simultaneous + connections the pool will allow is pool_size + max_overflow, and the total + number of "sleeping" connections the pool will allow is pool_size. + max_overflow can be set to -1 to indicate no overflow limit; no limit will + be placed on the total number of concurrent connections. Defaults to 10, + will be used if value of the parameter in `None`. + :type max_overflow: int + :default max_overflow: None + + :keyword pool_timeout: The number of seconds to wait before giving up on + returning a connection. Defaults to 30, will be used if value of the + parameter is `None`. + :type pool_timeout: int + :default pool_timeout: None + """ conf.register_opts(database_opts, group='database') |