Description of database configuration options

Configuration option = Default value	Description
[DEFAULT]
database_connection = None	(StrOpt) DEPRECATED - Database connection string.
[database]
alarm_connection = None	(StrOpt) The connection string used to connect to the alarm database. (if unset, connection is used)
alarm_history_time_to_live = -1	(IntOpt) Number of seconds that alarm histories are kept in the database for (<= 0 means forever).
backend = sqlalchemy	(StrOpt) The back end to use for the database.
connection = None	(StrOpt) The SQLAlchemy connection string to use to connect to the database.
connection_debug = 0	(IntOpt) Verbosity of SQL debugging information: 0=None, 100=Everything.
connection_trace = False	(BoolOpt) Add Python stack traces to SQL as comment strings.
db2nosql_resource_id_maxlen = 512	(IntOpt) The max length of resources id in DB2 nosql, the value should be larger than len(hostname) * 2 as compute node's resource id is <hostname>_<nodename>.
db_inc_retry_interval = True	(BoolOpt) If True, increases the interval between retries of a database operation up to db_max_retry_interval.
db_max_retries = 20	(IntOpt) Maximum retries in case of connection error or deadlock error before error is raised. Set to -1 to specify an infinite retry count.
db_max_retry_interval = 10	(IntOpt) If db_inc_retry_interval is set, the maximum seconds between retries of a database operation.
db_retry_interval = 1	(IntOpt) Seconds between retries of a database transaction.
event_connection = None	(StrOpt) The connection string used to connect to the event database. (if unset, connection is used)
event_time_to_live = -1	(IntOpt) Number of seconds that events are kept in the database for (<= 0 means forever).
idle_timeout = 3600	(IntOpt) Timeout before idle SQL connections are reaped.
max_overflow = None	(IntOpt) If set, use this value for max_overflow with SQLAlchemy.
max_pool_size = None	(IntOpt) Maximum number of SQL connections to keep open in a pool.
max_retries = 10	(IntOpt) Maximum number of database connection retries during startup. Set to -1 to specify an infinite retry count.
metering_connection = None	(StrOpt) The connection string used to connect to the metering database. (if unset, connection is used)
metering_time_to_live = -1	(IntOpt) Number of seconds that samples are kept in the database for (<= 0 means forever).
min_pool_size = 1	(IntOpt) Minimum number of SQL connections to keep open in a pool.
mongodb_replica_set =	(StrOpt) The name of the replica set which is used to connect to MongoDB database. If it is set, MongoReplicaSetClient will be used instead of MongoClient.
mysql_sql_mode = TRADITIONAL	(StrOpt) The SQL mode to be used for MySQL sessions. This option, including the default, overrides any server-set SQL mode. To use whatever SQL mode is set by the server configuration, set this to no value. Example: mysql_sql_mode=
pool_timeout = None	(IntOpt) If set, use this value for pool_timeout with SQLAlchemy.
retry_interval = 10	(IntOpt) Interval between retries of opening a SQL connection.
slave_connection = None	(StrOpt) The SQLAlchemy connection string to use to connect to the slave database.
sqlite_db = oslo.sqlite	(StrOpt) The file name to use with SQLite.
sqlite_synchronous = True	(BoolOpt) If True, SQLite uses synchronous mode.
use_db_reconnect = False	(BoolOpt) Enable the experimental use of database reconnect on connection lost.