Tuning postgresql.

config/postgresql.conf

@@ -106,7 +106,7 @@ ssl = false				# (change requires restart)
 
 # - Memory -
 
-shared_buffers = 512MB			# min 128kB
+shared_buffers = 16GB			# min 128kB
 					# (change requires restart)
 #temp_buffers = 8MB			# min 800kB
 #max_prepared_transactions = 0		# zero disables the feature
@@ -171,7 +171,7 @@ wal_buffers = 16MB			# min 32kB
 
 # - Checkpoints -
 
-checkpoint_segments = 10		# in logfile segments, min 1, 16MB each
+checkpoint_segments = 40		# in logfile segments, min 1, 16MB each
 #checkpoint_timeout = 5min		# range 30s-1h
 #checkpoint_completion_target = 0.5	# checkpoint target duration, 0.0 - 1.0
 #checkpoint_warning = 30s		# 0 disables
@@ -195,7 +195,7 @@ wal_keep_segments = 320		# in logfile segments, 16MB each; 0 disables
 
 # - Standby Servers -
 
-#hot_standby = off			# "on" allows queries during recovery
+hot_standby = on			# "on" allows queries during recovery
 					# (change requires restart)
 #max_standby_archive_delay = 30s	# max delay before canceling queries
 					# when reading WAL from archive;
@@ -229,7 +229,7 @@ wal_keep_segments = 320		# in logfile segments, 16MB each; 0 disables
 #cpu_tuple_cost = 0.01			# same scale as above
 #cpu_index_tuple_cost = 0.005		# same scale as above
 #cpu_operator_cost = 0.0025		# same scale as above
-effective_cache_size = 6GB
+effective_cache_size = 32GB
 
 # - Genetic Query Optimizer -
 
@@ -338,7 +338,7 @@ effective_cache_size = 6GB
 					#   fatal
 					#   panic (effectively off)
 
-#log_min_duration_statement = -1	# -1 is disabled, 0 logs all statements
+log_min_duration_statement = 5000	# -1 is disabled, 0 logs all statements
 					# and their durations, > 0 logs only
 					# statements running at least this number
 					# of milliseconds

fabfile.py

@@ -870,6 +870,13 @@ def setup_postgres(standby=False):
     sudo('/etc/init.d/postgresql stop')
     sudo('/etc/init.d/postgresql start')
 
+def config_postgres(standby=False):
+    put('config/postgresql%s.conf' % (
+        ('_standby' if standby else ''),
+    ), '/etc/postgresql/9.4/main/postgresql.conf', use_sudo=True)
+
+    sudo('/etc/init.d/postgresql reload 9.4')
+    
 def copy_postgres_to_standby(master='db01'):
     # http://www.rassoc.com/gregr/weblog/2013/02/16/zero-to-postgresql-streaming-replication-in-10-mins/
     

templates/maintenance_off.html

@@ -85,7 +85,7 @@
                         <img src="/media/img/logo_512.png" class="logo">
                         <h1>NewsBlur is in <span class="error404">maintenance mode</span></h1>
                         <div class="description">
-                            <p>Digital Ocean, NewsBlur's hosting provider, is undergoing maintenance and should be back within the next half hour. I'll keep you updated until then, but for now NewsBlur is taking a rest.</p>
+                            <p>Tuning PostgreSQL requires a restart of the database. This should take no more than 2 minutes.</p>
                             <p>To pass the time, <a href="http://mlkshk.com/popular">check out what's popular on MLKSHK</a>.</p>
                         </div>
                     </div>