diff --git a/admin_frontend/src/web_app.rs b/admin_frontend/src/web_app.rs
index 05665a1c..ce502bba 100644
--- a/admin_frontend/src/web_app.rs
+++ b/admin_frontend/src/web_app.rs
@@ -157,7 +157,7 @@ async fn login_callback_query_handler(
           let found = accepted_invitations
             .iter()
             .find(|w| w.invite_id.to_string() == invite_id);
-          if let Some(_) = found {
+          if found.is_some() {
             return Ok((jar, render_template(templates::OpenAppFlowyOrDownload {})?));
           }
         }
diff --git a/deploy.env b/deploy.env
index a1c399d6..12055165 100644
--- a/deploy.env
+++ b/deploy.env
@@ -8,6 +8,7 @@ APPFLOWY_GOTRUE_BASE_URL=http://gotrue:9999
 APPFLOWY_DATABASE_URL=postgres://postgres:password@postgres:5432/postgres
 APPFLOWY_ACCESS_CONTROL=true
 APPFLOWY_WEBSOCKET_MAILBOX_SIZE=6000
+APPFLOWY_DATABASE_MAX_CONNECTIONS=40
 
 # admin frontend
 ## URL that connects to redis docker container
diff --git a/dev.env b/dev.env
index 4c91a531..6b25d2f2 100644
--- a/dev.env
+++ b/dev.env
@@ -3,6 +3,7 @@ APPFLOWY_GOTRUE_BASE_URL=http://localhost:9999
 APPFLOWY_DATABASE_URL=postgres://postgres:password@localhost:5432/postgres
 APPFLOWY_ACCESS_CONTROL=true
 APPFLOWY_WEBSOCKET_MAILBOX_SIZE=6000
+APPFLOWY_DATABASE_MAX_CONNECTIONS=40
 
 # This file is used to set the environment variables for local development
 # Copy this file to .env and change the values as needed
diff --git a/docker-compose-ci.yml b/docker-compose-ci.yml
index 9ba4442a..cb3c355c 100644
--- a/docker-compose-ci.yml
+++ b/docker-compose-ci.yml
@@ -112,6 +112,8 @@ services:
       - APPFLOWY_S3_BUCKET=${APPFLOWY_S3_BUCKET}
       - APPFLOWY_S3_REGION=${APPFLOWY_S3_REGION}
       - APPFLOWY_ACCESS_CONTROL=${APPFLOWY_ACCESS_CONTROL}
+      # For the CI testing, we set the database connection to 20. The default value is 40.
+      - APPFLOWY_DATABASE_MAX_CONNECTIONS=20
       - APPFLOWY_AI_SERVER_HOST=${APPFLOWY_AI_SERVER_HOST}
       - APPFLOWY_AI_SERVER_PORT=${APPFLOWY_AI_SERVER_PORT}
     build:
diff --git a/docker-compose.yml b/docker-compose.yml
index 5557907c..ca79ed59 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -108,6 +108,7 @@ services:
       - APPFLOWY_S3_BUCKET=${APPFLOWY_S3_BUCKET}
       - APPFLOWY_S3_REGION=${APPFLOWY_S3_REGION}
       - APPFLOWY_ACCESS_CONTROL=${APPFLOWY_ACCESS_CONTROL}
+      - APPFLOWY_DATABASE_MAX_CONNECTIONS=${APPFLOWY_DATABASE_MAX_CONNECTIONS}
       - APPFLOWY_AI_SERVER_HOST=${APPFLOWY_AI_SERVER_HOST}
       - APPFLOWY_AI_SERVER_PORT=${APPFLOWY_AI_SERVER_PORT}
     build:
diff --git a/libs/database/src/file/file_storage.rs b/libs/database/src/file/file_storage.rs
index 22febd5f..289397c9 100644
--- a/libs/database/src/file/file_storage.rs
+++ b/libs/database/src/file/file_storage.rs
@@ -5,6 +5,7 @@ use crate::resource_usage::{
 use app_error::AppError;
 use async_trait::async_trait;
 use sqlx::PgPool;
+
 use tracing::{instrument, warn};
 use uuid::Uuid;
 
@@ -60,18 +61,16 @@ where
     }
 
     let obj_key = format!("{}/{}", workspace_id, file_id);
-    let mut tx = self.pg_pool.begin().await?;
+    self.client.pub_blob(obj_key, &file_data).await?;
+
     insert_blob_metadata(
-      &mut tx,
+      &self.pg_pool,
       &file_id,
       &workspace_id,
       &file_type,
       file_data.len(),
     )
     .await?;
-
-    self.client.pub_blob(obj_key, &file_data).await?;
-    tx.commit().await?;
     Ok(())
   }
 
diff --git a/libs/database/src/resource_usage.rs b/libs/database/src/resource_usage.rs
index dcfa2d90..cc87fc4c 100644
--- a/libs/database/src/resource_usage.rs
+++ b/libs/database/src/resource_usage.rs
@@ -34,7 +34,7 @@ pub async fn is_blob_metadata_exists(
 
 #[instrument(level = "trace", skip_all, err)]
 pub async fn insert_blob_metadata(
-  tx: &mut Transaction<'_, sqlx::Postgres>,
+  pg_pool: &PgPool,
   file_id: &str,
   workspace_id: &Uuid,
   file_type: &str,
@@ -54,10 +54,12 @@ pub async fn insert_blob_metadata(
     file_type,
     file_size as i64,
   )
-  .execute(tx.deref_mut())
+  .execute(pg_pool)
   .await?;
   let n = res.rows_affected();
-  assert_eq!(n, 1);
+  if n != 1 {
+    tracing::error!("insert_blob_metadata: rows_affected: {}", n);
+  }
   Ok(())
 }
 
diff --git a/tests/collab/pending_write_test.rs b/tests/collab/pending_write_test.rs
index 742003b3..efc40ff2 100644
--- a/tests/collab/pending_write_test.rs
+++ b/tests/collab/pending_write_test.rs
@@ -74,10 +74,21 @@ async fn simulate_small_data_set_write(pool: PgPool) {
       .await
       .unwrap();
 
+    assert_eq!(
+      encode_collab_from_disk.doc_state.len(),
+      original_encode_collab.doc_state.len(),
+      "doc_state length mismatch"
+    );
     assert_eq!(
       encode_collab_from_disk.doc_state,
       original_encode_collab.doc_state
     );
+
+    assert_eq!(
+      encode_collab_from_disk.state_vector.len(),
+      original_encode_collab.state_vector.len(),
+      "state_vector length mismatch"
+    );
     assert_eq!(
       encode_collab_from_disk.state_vector,
       original_encode_collab.state_vector
@@ -103,49 +114,48 @@ async fn simulate_large_data_set_write(pool: PgPool) {
   let queue_name = uuid::Uuid::new_v4().to_string();
   let storage_queue = StorageQueue::new(collab_cache.clone(), conn, &queue_name);
 
-  let queries = Arc::new(Mutex::new(Vec::new()));
-  for i in 0..3 {
-    // sleep random seconds less than 2 seconds. because the runtime is single-threaded,
-    // we need sleep a little time to let the runtime switch to other tasks.
-    sleep(Duration::from_millis(i % 2)).await;
-
-    let encode_collab = EncodedCollab::new_v1(
-      generate_random_bytes(10 * 1024),
-      generate_random_bytes(2 * 1024 * 1024),
-    );
-    let params = CollabParams {
-      object_id: format!("object_id_{}", i),
-      collab_type: CollabType::Unknown,
-      encoded_collab_v1: encode_collab.encode_to_bytes().unwrap(),
-    };
-    storage_queue
-      .push(&user.workspace_id, &user.uid, &params, WritePriority::Low)
-      .await
-      .unwrap();
-    queries.lock().await.push((params, encode_collab));
-  }
+  let origin_encode_collab = EncodedCollab::new_v1(
+    generate_random_bytes(10 * 1024),
+    generate_random_bytes(2 * 1024 * 1024),
+  );
+  let params = CollabParams {
+    object_id: uuid::Uuid::new_v4().to_string(),
+    collab_type: CollabType::Unknown,
+    encoded_collab_v1: origin_encode_collab.encode_to_bytes().unwrap(),
+  };
+  storage_queue
+    .push(&user.workspace_id, &user.uid, &params, WritePriority::Low)
+    .await
+    .unwrap();
 
   // Allow some time for processing
   sleep(Duration::from_secs(30)).await;
 
-  // Check that all items are processed correctly
-  for (params, original_encode_collab) in queries.lock().await.iter() {
-    let query = QueryCollab {
-      object_id: params.object_id.clone(),
-      collab_type: params.collab_type.clone(),
-    };
-    let encode_collab_from_disk = collab_cache
-      .get_encode_collab_from_disk(&user.uid, query)
-      .await
-      .unwrap();
+  let query = QueryCollab {
+    object_id: params.object_id.clone(),
+    collab_type: params.collab_type.clone(),
+  };
+  let encode_collab_from_disk = collab_cache
+    .get_encode_collab_from_disk(&user.uid, query)
+    .await
+    .unwrap();
+  assert_eq!(
+    encode_collab_from_disk.doc_state.len(),
+    origin_encode_collab.doc_state.len(),
+    "doc_state length mismatch"
+  );
+  assert_eq!(
+    encode_collab_from_disk.doc_state,
+    origin_encode_collab.doc_state
+  );
 
-    assert_eq!(
-      encode_collab_from_disk.doc_state,
-      original_encode_collab.doc_state
-    );
-    assert_eq!(
-      encode_collab_from_disk.state_vector,
-      original_encode_collab.state_vector
-    );
-  }
+  assert_eq!(
+    encode_collab_from_disk.state_vector.len(),
+    origin_encode_collab.state_vector.len(),
+    "state_vector length mismatch"
+  );
+  assert_eq!(
+    encode_collab_from_disk.state_vector,
+    origin_encode_collab.state_vector
+  );
 }
diff --git a/tests/workspace/blob/put_and_get.rs b/tests/workspace/blob/put_and_get.rs
index 53e98360..40ffa2ec 100644
--- a/tests/workspace/blob/put_and_get.rs
+++ b/tests/workspace/blob/put_and_get.rs
@@ -134,3 +134,32 @@ async fn put_and_delete_workspace() {
     assert!(is_none);
   }
 }
+
+#[tokio::test]
+async fn simulate_30_put_blob_request_test() {
+  let (c1, _user1) = generate_unique_registered_user_client().await;
+  let workspace_id = workspace_id_from_client(&c1).await;
+
+  let mut handles = vec![];
+  for _ in 0..30 {
+    let cloned_client = c1.clone();
+    let cloned_workspace_id = workspace_id.clone();
+    let handle = tokio::spawn(async move {
+      let mime = mime::TEXT_PLAIN_UTF_8;
+      let file_id = uuid::Uuid::new_v4().to_string();
+      let url = cloned_client.get_blob_url(&cloned_workspace_id, &file_id);
+      let data = vec![0; 3 * 1024 * 1024];
+      cloned_client.put_blob(&url, data, &mime).await.unwrap();
+      url
+    });
+    handles.push(handle);
+  }
+
+  let results = futures::future::join_all(handles).await;
+  for result in results {
+    let url = result.unwrap();
+    let (_, got_data) = c1.get_blob(&url).await.unwrap();
+    assert_eq!(got_data, vec![0; 3 * 1024 * 1024]);
+    c1.delete_blob(&url).await.unwrap();
+  }
+}