diff --git a/docker/.env.example b/docker/.env.example
index c9981baaba..69c2e80785 100644
--- a/docker/.env.example
+++ b/docker/.env.example
@@ -233,7 +233,7 @@ NEXT_PUBLIC_ENABLE_SINGLE_DOLLAR_LATEX=false
 
 # Database type, supported values are `postgresql` and `mysql`
 DB_TYPE=postgresql
-
+# For MySQL, only `root` user is supported for now
 DB_USERNAME=postgres
 DB_PASSWORD=difyai123456
 DB_HOST=db_postgres
@@ -1076,24 +1076,10 @@ MAX_TREE_DEPTH=50
 # ------------------------------
 # Environment Variables for database Service
 # ------------------------------
-
-# The name of the default postgres user.
-POSTGRES_USER=${DB_USERNAME}
-# The password for the default postgres user.
-POSTGRES_PASSWORD=${DB_PASSWORD}
-# The name of the default postgres database.
-POSTGRES_DB=${DB_DATABASE}
 # Postgres data directory
 PGDATA=/var/lib/postgresql/data/pgdata
 
 # MySQL Default Configuration
-# The name of the default mysql user.
-MYSQL_USERNAME=${DB_USERNAME}
-# The password for the default mysql user.
-MYSQL_PASSWORD=${DB_PASSWORD}
-# The name of the default mysql database.
-MYSQL_DATABASE=${DB_DATABASE}
-# MySQL data directory
 MYSQL_HOST_VOLUME=./volumes/mysql/data
 
 # ------------------------------
diff --git a/docker/docker-compose-template.yaml b/docker/docker-compose-template.yaml
index 703a60ef67..57e9f3fd67 100644
--- a/docker/docker-compose-template.yaml
+++ b/docker/docker-compose-template.yaml
@@ -139,9 +139,9 @@ services:
       - postgresql
     restart: always
     environment:
-      POSTGRES_USER: ${POSTGRES_USER:-postgres}
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-difyai123456}
-      POSTGRES_DB: ${POSTGRES_DB:-dify}
+      POSTGRES_USER: ${DB_USERNAME:-postgres}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-difyai123456}
+      POSTGRES_DB: ${DB_DATABASE:-dify}
       PGDATA: ${PGDATA:-/var/lib/postgresql/data/pgdata}
     command: >
       postgres -c 'max_connections=${POSTGRES_MAX_CONNECTIONS:-100}'
@@ -161,7 +161,7 @@ services:
           "-h",
           "db_postgres",
           "-U",
-          "${PGUSER:-postgres}",
+          "${DB_USERNAME:-postgres}",
           "-d",
           "${DB_DATABASE:-dify}",
         ]
@@ -176,8 +176,8 @@ services:
       - mysql
     restart: always
     environment:
-      MYSQL_ROOT_PASSWORD: ${MYSQL_PASSWORD:-difyai123456}
-      MYSQL_DATABASE: ${MYSQL_DATABASE:-dify}
+      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD:-difyai123456}
+      MYSQL_DATABASE: ${DB_DATABASE:-dify}
     command: >
       --max_connections=1000
       --innodb_buffer_pool_size=${MYSQL_INNODB_BUFFER_POOL_SIZE:-512M}
@@ -193,7 +193,7 @@ services:
           "ping",
           "-u",
           "root",
-          "-p${MYSQL_PASSWORD:-difyai123456}",
+          "-p${DB_PASSWORD:-difyai123456}",
         ]
       interval: 1s
       timeout: 3s
diff --git a/docker/docker-compose.middleware.yaml b/docker/docker-compose.middleware.yaml
index f1beefc2f2..080f6e211b 100644
--- a/docker/docker-compose.middleware.yaml
+++ b/docker/docker-compose.middleware.yaml
@@ -9,8 +9,8 @@ services:
     env_file:
       - ./middleware.env
     environment:
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-difyai123456}
-      POSTGRES_DB: ${POSTGRES_DB:-dify}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-difyai123456}
+      POSTGRES_DB: ${DB_DATABASE:-dify}
       PGDATA: ${PGDATA:-/var/lib/postgresql/data/pgdata}
     command: >
       postgres -c 'max_connections=${POSTGRES_MAX_CONNECTIONS:-100}'
@@ -32,9 +32,9 @@ services:
           "-h",
           "db_postgres",
           "-U",
-          "${PGUSER:-postgres}",
+          "${DB_USERNAME:-postgres}",
           "-d",
-          "${POSTGRES_DB:-dify}",
+          "${DB_DATABASE:-dify}",
         ]
       interval: 1s
       timeout: 3s
@@ -48,8 +48,8 @@ services:
     env_file:
       - ./middleware.env
     environment:
-      MYSQL_ROOT_PASSWORD: ${MYSQL_PASSWORD:-difyai123456}
-      MYSQL_DATABASE: ${MYSQL_DATABASE:-dify}
+      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD:-difyai123456}
+      MYSQL_DATABASE: ${DB_DATABASE:-dify}
     command: >
       --max_connections=1000
       --innodb_buffer_pool_size=${MYSQL_INNODB_BUFFER_POOL_SIZE:-512M}
@@ -67,7 +67,7 @@ services:
           "ping",
           "-u",
           "root",
-          "-p${MYSQL_PASSWORD:-difyai123456}",
+          "-p${DB_PASSWORD:-difyai123456}",
         ]
       interval: 1s
       timeout: 3s
diff --git a/docker/docker-compose.yaml b/docker/docker-compose.yaml
index de2e3943fe..873b49c6e4 100644
--- a/docker/docker-compose.yaml
+++ b/docker/docker-compose.yaml
@@ -455,13 +455,7 @@ x-shared-env: &shared-api-worker-env
   TEXT_GENERATION_TIMEOUT_MS: ${TEXT_GENERATION_TIMEOUT_MS:-60000}
   ALLOW_UNSAFE_DATA_SCHEME: ${ALLOW_UNSAFE_DATA_SCHEME:-false}
   MAX_TREE_DEPTH: ${MAX_TREE_DEPTH:-50}
-  POSTGRES_USER: ${POSTGRES_USER:-${DB_USERNAME}}
-  POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-${DB_PASSWORD}}
-  POSTGRES_DB: ${POSTGRES_DB:-${DB_DATABASE}}
   PGDATA: ${PGDATA:-/var/lib/postgresql/data/pgdata}
-  MYSQL_USERNAME: ${MYSQL_USERNAME:-${DB_USERNAME}}
-  MYSQL_PASSWORD: ${MYSQL_PASSWORD:-${DB_PASSWORD}}
-  MYSQL_DATABASE: ${MYSQL_DATABASE:-${DB_DATABASE}}
   MYSQL_HOST_VOLUME: ${MYSQL_HOST_VOLUME:-./volumes/mysql/data}
   SANDBOX_API_KEY: ${SANDBOX_API_KEY:-dify-sandbox}
   SANDBOX_GIN_MODE: ${SANDBOX_GIN_MODE:-release}
@@ -774,9 +768,9 @@ services:
       - postgresql
     restart: always
     environment:
-      POSTGRES_USER: ${POSTGRES_USER:-postgres}
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-difyai123456}
-      POSTGRES_DB: ${POSTGRES_DB:-dify}
+      POSTGRES_USER: ${DB_USERNAME:-postgres}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-difyai123456}
+      POSTGRES_DB: ${DB_DATABASE:-dify}
       PGDATA: ${PGDATA:-/var/lib/postgresql/data/pgdata}
     command: >
       postgres -c 'max_connections=${POSTGRES_MAX_CONNECTIONS:-100}'
@@ -796,7 +790,7 @@ services:
           "-h",
           "db_postgres",
           "-U",
-          "${PGUSER:-postgres}",
+          "${DB_USERNAME:-postgres}",
           "-d",
           "${DB_DATABASE:-dify}",
         ]
@@ -811,8 +805,8 @@ services:
       - mysql
     restart: always
     environment:
-      MYSQL_ROOT_PASSWORD: ${MYSQL_PASSWORD:-difyai123456}
-      MYSQL_DATABASE: ${MYSQL_DATABASE:-dify}
+      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD:-difyai123456}
+      MYSQL_DATABASE: ${DB_DATABASE:-dify}
     command: >
       --max_connections=1000
       --innodb_buffer_pool_size=${MYSQL_INNODB_BUFFER_POOL_SIZE:-512M}
@@ -828,7 +822,7 @@ services:
           "ping",
           "-u",
           "root",
-          "-p${MYSQL_PASSWORD:-difyai123456}",
+          "-p${DB_PASSWORD:-difyai123456}",
         ]
       interval: 1s
       timeout: 3s
diff --git a/docker/middleware.env.example b/docker/middleware.env.example
index dbfb75a8d6..b45f58df17 100644
--- a/docker/middleware.env.example
+++ b/docker/middleware.env.example
@@ -4,6 +4,7 @@
 # Database Configuration
 # Database type, supported values are `postgresql` and `mysql`
 DB_TYPE=postgresql
+# For MySQL, only `root` user is supported for now
 DB_USERNAME=postgres
 DB_PASSWORD=difyai123456
 DB_HOST=db_postgres
@@ -11,11 +12,6 @@ DB_PORT=5432
 DB_DATABASE=dify
 
 # PostgreSQL Configuration
-POSTGRES_USER=${DB_USERNAME}
-# The password for the default postgres user.
-POSTGRES_PASSWORD=${DB_PASSWORD}
-# The name of the default postgres database.
-POSTGRES_DB=${DB_DATABASE}
 # postgres data directory
 PGDATA=/var/lib/postgresql/data/pgdata
 PGDATA_HOST_VOLUME=./volumes/db/data
@@ -65,11 +61,6 @@ POSTGRES_STATEMENT_TIMEOUT=0
 POSTGRES_IDLE_IN_TRANSACTION_SESSION_TIMEOUT=0
 
 # MySQL Configuration
-MYSQL_USERNAME=${DB_USERNAME}
-# MySQL password
-MYSQL_PASSWORD=${DB_PASSWORD}
-# MySQL database name
-MYSQL_DATABASE=${DB_DATABASE}
 # MySQL data directory host volume
 MYSQL_HOST_VOLUME=./volumes/mysql/data