diff --git a/libs/realtime/src/collaborate/metrics.rs b/libs/realtime/src/collaborate/metrics.rs
index 20c1e5bc..3a296648 100644
--- a/libs/realtime/src/collaborate/metrics.rs
+++ b/libs/realtime/src/collaborate/metrics.rs
@@ -46,6 +46,7 @@ impl RealtimeMetrics {
   }
 
   pub fn record_encode_collab_mem_hit_rate(&self, rate: f64) {
+    trace!("[metrics]: encode collab hit rate: {}", rate);
     self.encode_collab_mem_hit_rate.set(rate as i64);
   }
 
diff --git a/src/config/config.rs b/src/config/config.rs
index d8b5d2d0..bd91e7b5 100644
--- a/src/config/config.rs
+++ b/src/config/config.rs
@@ -94,7 +94,7 @@ pub fn get_configuration() -> Result<Config, anyhow::Error> {
       require_ssl: get_env_var("APPFLOWY_DATABASE_REQUIRE_SSL", "false")
         .parse()
         .context("fail to get APPFLOWY_DATABASE_REQUIRE_SSL")?,
-      max_connections: get_env_var("APPFLOWY_DATABASE_MAX_CONNECTIONS", "20")
+      max_connections: get_env_var("APPFLOWY_DATABASE_MAX_CONNECTIONS", "40")
         .parse()
         .context("fail to get APPFLOWY_DATABASE_MAX_CONNECTIONS")?,
       database_name: get_env_var("APPFLOWY_DATABASE_NAME", "postgres"),