[server] Make connection pooler configurable and set better default values
Drop the configuration connections-pool-size and add new configurations options:
* connections-pool-min-size. Set to 0 by default so we open connections only
when needed. This avoid opening min-size*processes connections at startup,
which is, it think, a good default.
* connections-pool-max-size. Set to 0 (unlimited) by default, so we move the
bottleneck to postgresql.
* connections-idle-timeout. Set to 10 minutes. I don't have arguments about
this except that this is the default in pgbouncer.
typemap = repo.system_source.dbhelper.TYPE_MAPPING
sqls = """
CREATE TABLE transactions (
tx_uuid CHAR(32) PRIMARY KEY NOT NULL,
tx_user INTEGER NOT NULL,
tx_time %s NOT NULL
);;
CREATE INDEX transactions_tx_user_idx ON transactions(tx_user);;
CREATE TABLE tx_entity_actions (
tx_uuid CHAR(32) REFERENCES transactions(tx_uuid) ON DELETE CASCADE,
txa_action CHAR(1) NOT NULL,
txa_public %s NOT NULL,
txa_order INTEGER,
eid INTEGER NOT NULL,
etype VARCHAR(64) NOT NULL,
changes %s
);;
CREATE INDEX tx_entity_actions_txa_action_idx ON tx_entity_actions(txa_action);;
CREATE INDEX tx_entity_actions_txa_public_idx ON tx_entity_actions(txa_public);;
CREATE INDEX tx_entity_actions_eid_idx ON tx_entity_actions(eid);;
CREATE INDEX tx_entity_actions_etype_idx ON tx_entity_actions(etype);;
CREATE TABLE tx_relation_actions (
tx_uuid CHAR(32) REFERENCES transactions(tx_uuid) ON DELETE CASCADE,
txa_action CHAR(1) NOT NULL,
txa_public %s NOT NULL,
txa_order INTEGER,
eid_from INTEGER NOT NULL,
eid_to INTEGER NOT NULL,
rtype VARCHAR(256) NOT NULL
);;
CREATE INDEX tx_relation_actions_txa_action_idx ON tx_relation_actions(txa_action);;
CREATE INDEX tx_relation_actions_txa_public_idx ON tx_relation_actions(txa_public);;
CREATE INDEX tx_relation_actions_eid_from_idx ON tx_relation_actions(eid_from);;
CREATE INDEX tx_relation_actions_eid_to_idx ON tx_relation_actions(eid_to)
""" % (typemap['Datetime'],
typemap['Boolean'], typemap['Bytes'], typemap['Boolean'])
for statement in sqls.split(';;'):
sql(statement)