odoo version = 14
web server = apache2

I have configured odoo worker in configuration file and it was working perfectly and this server has 1244 DB's in it.

configuration file of odoo is mention below 

csv_internal_sep = ,
data_dir = /opt/odoo14/.local/share/Odoo
db_host = False
db_maxconn = 64
db_name = False
db_password = False
db_port = False
db_sslmode = prefer
db_template = template0
db_user = odoo14
dbfilter = ^%d$
demo = {}
email_from = False
geoip_database = /usr/share/GeoIP/GeoLite2-City.mmdb
http_enable = True
http_interface =
http_port = 8069
import_partial =
#limit_memory_hard = 2684354560
#limit_memory_soft = 2147483648
limit_memory_hard = 45634027520
limit_memory_soft = 36507222016
limit_request = 8192
limit_time_cpu = 999999999999999
limit_time_real = 999999999999999
limit_time_real_cron = -1
list_db = True
log_db = False
log_db_level = warning
log_handler = :INFO
log_level = info
logfile = /var/log/odoo14/odoo14-server.log
longpolling_port = 8072
max_cron_threads = 2
osv_memory_age_limit = False
osv_memory_count_limit = False
pg_path =
pidfile =
proxy_mode = True
reportgz = False
screencasts =
screenshots = /tmp/odoo_tests
server_wide_modules = base,web
smtp_password = False
smtp_port = 25
smtp_server = localhost
smtp_ssl = False
smtp_user = False
syslog = False
test_enable = False
test_file =
test_tags = None
transient_age_limit = 1.0
translate_modules = ['all']
unaccent = False
upgrade_path =
without_demo = False
#workers = 0
workers = 17

CONFIG FILE OF APACHE

Order deny,allow
Allow from all
ProxyRequests Off
ProxyPass / http://domainname:8069/
ProxyPassReverse / http://domainname:8069/
ProxyVia On
LogLevel warn

LOG FILE OF ODOO

Traceback (most recent call last):
File "/opt/odoo14/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
result = request.dispatch()
File "/opt/odoo14/odoo/odoo/http.py", line 683, in dispatch
result = self._call_function(**self.params)
File "/opt/odoo14/odoo/odoo/http.py", line 359, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/opt/odoo14/odoo/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/opt/odoo14/odoo/odoo/http.py", line 347, in checked_call
result = self.endpoint(*a, **kw)
File "/opt/odoo14/odoo/odoo/http.py", line 912, in __call__
return self.method(*args, **kw)
File "/opt/odoo14/odoo/odoo/http.py", line 531, in response_wrap
response = f(*args, **kw)
File "/opt/odoo14/odoo/addons/bus/controllers/main.py", line 35, in poll
raise Exception("bus.Bus unavailable")
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/opt/odoo14/odoo/odoo/http.py", line 639, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/opt/odoo14/odoo/odoo/http.py", line 315, in _handle_exception
raise exception.with_traceback(None) from new_cause
Exception: bus.Bus unavailable

Anyone please help me to solve this issue