update rally conf sample

Change-Id: I56018afa163482e58449618d9366230801da427f

etc/rally/rally.conf.sample

@@ -1,5 +1,35 @@
 [DEFAULT]
 
+#
+# Options defined in rally.exceptions
+#
+
+# make exception message format errors fatal (boolean value)
+#fatal_exception_format_errors=false
+
+
+#
+# Options defined in rally.openstack.common.db.sqlalchemy.session
+#
+
+# the filename to use with sqlite (string value)
+#sqlite_db=rally.sqlite
+
+# If true, use synchronous mode for sqlite (boolean value)
+#sqlite_synchronous=true
+
+
+#
+# Options defined in rally.openstack.common.lockutils
+#
+
+# Whether to disable inter-process locks (boolean value)
+#disable_process_locking=false
+
+# Directory to use for lock files. (string value)
+#lock_path=<None>
+
+
 #
 # Options defined in rally.openstack.common.log
 #
@@ -81,3 +111,64 @@
 #syslog_log_facility=LOG_USER
 
 
+[database]
+
+#
+# Options defined in rally.openstack.common.db.api
+#
+
+# The backend to use for db (string value)
+#backend=sqlalchemy
+
+# Enable the experimental use of thread pooling for all DB API
+# calls (boolean value)
+#use_tpool=false
+
+
+#
+# Options defined in rally.openstack.common.db.sqlalchemy.session
+#
+
+# The SQLAlchemy connection string used to connect to the
+# database (string value)
+#connection=sqlite:////rally/openstack/common/db/$sqlite_db
+
+# The SQLAlchemy connection string used to connect to the
+# slave database (string value)
+#slave_connection=
+
+# timeout before idle sql connections are reaped (integer
+# value)
+#idle_timeout=3600
+
+# Minimum number of SQL connections to keep open in a pool
+# (integer value)
+#min_pool_size=1
+
+# Maximum number of SQL connections to keep open in a pool
+# (integer value)
+#max_pool_size=<None>
+
+# maximum db connection retries during startup. (setting -1
+# implies an infinite retry count) (integer value)
+#max_retries=10
+
+# interval between retries of opening a sql connection
+# (integer value)
+#retry_interval=10
+
+# If set, use this value for max_overflow with sqlalchemy
+# (integer value)
+#max_overflow=<None>
+
+# Verbosity of SQL debugging information. 0=None,
+# 100=Everything (integer value)
+#connection_debug=0
+
+# Add python stack traces to SQL as comment strings (boolean
+# value)
+#connection_trace=false
+
+# If set, use this value for pool_timeout with sqlalchemy
+# (integer value)
+#pool_timeout=<None>