diff --git a/sql/engines/oracle.py b/sql/engines/oracle.py
index 6f25bbe71b..35d6f1bc67 100644
--- a/sql/engines/oracle.py
+++ b/sql/engines/oracle.py
@@ -590,10 +590,7 @@ def explain_check(self, db_name=None, sql="", close_conn=False):
             conn = self.get_connection()
             cursor = conn.cursor()
             if db_name:
-                cursor.execute(
-                    f" ALTER SESSION SET CURRENT_SCHEMA = :db_name ",
-                    {"db_name": db_name},
-                )
+                conn.conn.current_schema=db_name
             if re.match(r"^explain", sql, re.I):
                 sql = sql
             else:
@@ -669,10 +666,7 @@ def query(
             conn = self.get_connection()
             cursor = conn.cursor()
             if db_name:
-                cursor.execute(
-                    f" ALTER SESSION SET CURRENT_SCHEMA = :db_name ",
-                    {"db_name": db_name},
-                )
+                conn.current_schema=db_name
             sql = sql.rstrip(";")
             # 支持oralce查询SQL执行计划语句
             if re.match(r"^explain", sql, re.I):