diff --git a/src/main/java/com/alibaba/druid/sql/PagerUtils.java b/src/main/java/com/alibaba/druid/sql/PagerUtils.java
index 764543b3d4..a1dfa98f6d 100644
--- a/src/main/java/com/alibaba/druid/sql/PagerUtils.java
+++ b/src/main/java/com/alibaba/druid/sql/PagerUtils.java
@@ -123,10 +123,10 @@ public class PagerUtils {
         }
 
         OracleSelectQueryBlock countQueryBlock = new OracleSelectQueryBlock();
-        countQueryBlock.getSelectList().add(new SQLSelectItem(new SQLPropertyExpr(new SQLIdentifierExpr("_X"), "*")));
-        countQueryBlock.getSelectList().add(new SQLSelectItem(new SQLIdentifierExpr("ROWNUM"), "_RN"));
+        countQueryBlock.getSelectList().add(new SQLSelectItem(new SQLPropertyExpr(new SQLIdentifierExpr("XX"), "*")));
+        countQueryBlock.getSelectList().add(new SQLSelectItem(new SQLIdentifierExpr("ROWNUM"), "RN"));
 
-        countQueryBlock.setFrom(new SQLSubqueryTableSource(select, "_X"));
+        countQueryBlock.setFrom(new SQLSubqueryTableSource(select, "XX"));
         countQueryBlock.setWhere(new SQLBinaryOpExpr(new SQLIdentifierExpr("ROWNUM"), //
                                                      SQLBinaryOperator.LessThanOrEqual, //
                                                      new SQLNumberExpr(count + offset)));
@@ -136,8 +136,8 @@ public class PagerUtils {
 
         OracleSelectQueryBlock offsetQueryBlock = new OracleSelectQueryBlock();
         offsetQueryBlock.getSelectList().add(new SQLSelectItem(new SQLAllColumnExpr()));
-        offsetQueryBlock.setFrom(new SQLSubqueryTableSource(new SQLSelect(countQueryBlock), "_XX"));
-        offsetQueryBlock.setWhere(new SQLBinaryOpExpr(new SQLIdentifierExpr("_RN"), //
+        offsetQueryBlock.setFrom(new SQLSubqueryTableSource(new SQLSelect(countQueryBlock), "XXX"));
+        offsetQueryBlock.setWhere(new SQLBinaryOpExpr(new SQLIdentifierExpr("RN"), //
                                                       SQLBinaryOperator.GreaterThan, //
                                                       new SQLNumberExpr(offset)));
 
diff --git a/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_Limit_oracle_0.java b/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_Limit_oracle_0.java
index 6481dca199..5f6798739a 100644
--- a/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_Limit_oracle_0.java
+++ b/src/test/java/com/alibaba/druid/bvt/sql/PagerUtilsTest_Limit_oracle_0.java
@@ -12,11 +12,11 @@ public class PagerUtilsTest_Limit_oracle_0 extends TestCase {
     public void test_oracle_oderby_0() throws Exception {
         String sql = "select * from t order by id";
         String result = PagerUtils.limit(sql, JdbcConstants.ORACLE, 0, 10);
-        Assert.assertEquals("SELECT _X.*, ROWNUM AS _RN" + //
+        Assert.assertEquals("SELECT XX.*, ROWNUM AS RN" + //
                             "\nFROM (SELECT *" + //
                             "\n\tFROM t" + //
                             "\n\tORDER BY id" + //
-                            "\n\t) _X" + //
+                            "\n\t) XX" + //
                             "\nWHERE ROWNUM <= 10", result);
     }
 
@@ -32,39 +32,39 @@ public class PagerUtilsTest_Limit_oracle_0 extends TestCase {
         String sql = "select * from t";
         String result = PagerUtils.limit(sql, JdbcConstants.ORACLE, 10, 10);
         Assert.assertEquals("SELECT *" + //
-                            "\nFROM (SELECT _X.*, ROWNUM AS _RN" + //
+                            "\nFROM (SELECT XX.*, ROWNUM AS RN" + //
                             "\n\tFROM (SELECT *" + //
                             "\n\t\tFROM t" + //
-                            "\n\t\t) _X" + //
+                            "\n\t\t) XX" + //
                             "\n\tWHERE ROWNUM <= 20" + //
-                            "\n\t) _XX" + //
-                            "\nWHERE _RN > 10", result);
+                            "\n\t) XXX" + //
+                            "\nWHERE RN > 10", result);
     }
 
     public void test_oracle_2() throws Exception {
         String sql = "select * from t";
         String result = PagerUtils.limit(sql, JdbcConstants.ORACLE, 20, 10);
         Assert.assertEquals("SELECT *" + //
-                            "\nFROM (SELECT _X.*, ROWNUM AS _RN" + //
+                            "\nFROM (SELECT XX.*, ROWNUM AS RN" + //
                             "\n\tFROM (SELECT *" + //
                             "\n\t\tFROM t" + //
-                            "\n\t\t) _X" + //
+                            "\n\t\t) XX" + //
                             "\n\tWHERE ROWNUM <= 30" + //
-                            "\n\t) _XX" + //
-                            "\nWHERE _RN > 20", result);
+                            "\n\t) XXX" + //
+                            "\nWHERE RN > 20", result);
     }
 
     public void test_oracle_3() throws Exception {
         String sql = "select id, name, salary from t order by id, name";
         String result = PagerUtils.limit(sql, JdbcConstants.ORACLE, 20, 10);
         Assert.assertEquals("SELECT *" + //
-                            "\nFROM (SELECT _X.*, ROWNUM AS _RN" + //
+                            "\nFROM (SELECT XX.*, ROWNUM AS RN" + //
                             "\n\tFROM (SELECT id, name, salary" + //
                             "\n\t\tFROM t" + //
                             "\n\t\tORDER BY id, name" + //
-                            "\n\t\t) _X" + //
+                            "\n\t\t) XX" + //
                             "\n\tWHERE ROWNUM <= 30" + //
-                            "\n\t) _XX" + //
-                            "\nWHERE _RN > 20", result);
+                            "\n\t) XXX" + //
+                            "\nWHERE RN > 20", result);
     }
 }