diff --git a/ddl/schema.sql b/ddl/schema.sql
index d298e83..271005d 100644
--- a/ddl/schema.sql
+++ b/ddl/schema.sql
@@ -11,6 +11,8 @@
         password varchar(100) not null,
         user_id varchar(100) not null,
         refresh_token varchar(200),
-        primary key (oid),
-        constraint uk_member_user_id unique (user_id)
+        primary key (oid)
     );
+
+    create index idx_member_user_id 
+       on st_member (user_id);
diff --git a/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java b/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java
index 2421ef6..e1ee717 100644
--- a/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java
+++ b/src/main/java/com/bio/bio_backend/domain/user/member/entity/Member.java
@@ -18,8 +18,8 @@ import java.time.LocalDateTime;
 @Builder
 @Table(
     name = "st_member",
-    uniqueConstraints = {
-        @UniqueConstraint(name = "uk_member_user_id", columnNames = "user_id")
+    indexes = {
+        @Index(name = "idx_member_user_id", columnList = "user_id")
     }
 )
 public class Member extends BaseEntity {