diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java
index 5fe71d5765..0421df1da1 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleExprParser.java
@@ -402,7 +402,7 @@ public class OracleExprParser extends SQLExprParser {
             expr = interval;
         }
         
-        if (lexer.token() == Token.AT) {
+        if (identifierEquals("AT")) {
             char mark_ch = lexer.current();
             int mark_bp = lexer.bp();
             lexer.nextToken();
@@ -410,10 +410,10 @@ public class OracleExprParser extends SQLExprParser {
                 lexer.nextToken();
                 expr = new OracleDatetimeExpr(expr, new SQLIdentifierExpr("LOCAL"));
             } else {
-                if (lexer.token() == Token.TIME) {
+                if (identifierEquals("TIME")) {
                     lexer.nextToken();
                 } else {
-                    lexer.reset(mark_bp, mark_ch, Token.AT);
+                    lexer.reset(mark_bp, mark_ch, Token.IDENTIFIER);
                     return expr;
                 }
                 accept(Token.ZONE);
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleLexer.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleLexer.java
index 754c61007d..5e24efa430 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleLexer.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleLexer.java
@@ -104,7 +104,6 @@ public class OracleLexer extends Lexer {
         map.put("MERGE", Token.MERGE);
         map.put("USING", Token.USING);
         map.put("MATCHED", Token.MATCHED);
-        map.put("LOG", Token.LOG);
         map.put("ERRORS", Token.ERRORS);
         map.put("REJECT", Token.REJECT);
         map.put("UNLIMITED", Token.UNLIMITED);
@@ -119,9 +118,7 @@ public class OracleLexer extends Lexer {
         map.put("NOWAIT", Token.NOWAIT);
         map.put("SESSION", Token.SESSION);
         map.put("PROCEDURE", Token.PROCEDURE);
-        map.put("AT", Token.AT);
         map.put("LOCAL", Token.LOCAL);
-        map.put("TIME", Token.TIME);
         map.put("ZONE", Token.ZONE);
         map.put("SYSDATE", Token.SYSDATE);
         map.put("DECLARE", Token.DECLARE);
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
index 5bc17a4779..4b69ceae1e 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
@@ -592,7 +592,7 @@ public class OracleStatementParser extends SQLStatementParser {
 
             if (identifierEquals("SNAPSHOT")) {
                 lexer.nextToken();
-                accept(Token.LOG);
+                acceptIdentifier("LOG");
                 stmt.setPurgeSnapshotLog(true);
             } else {
                 throw new ParserException("TODO : " + lexer.token() + " " + lexer.stringVal());
@@ -964,7 +964,7 @@ public class OracleStatementParser extends SQLStatementParser {
             OracleAlterTableSplitPartition item = new OracleAlterTableSplitPartition();
             item.setName(this.exprParser.name());
 
-            if (lexer.token() == Token.AT) {
+            if (identifierEquals("AT")) {
                 lexer.nextToken();
                 accept(Token.LPAREN);
                 this.exprParser.exprList(item.getAt());
@@ -1340,7 +1340,7 @@ public class OracleStatementParser extends SQLStatementParser {
     }
 
     private OracleErrorLoggingClause parseErrorLoggingClause() {
-        if (lexer.token() == Token.LOG) {
+        if (identifierEquals("LOG")) {
             OracleErrorLoggingClause errorClause = new OracleErrorLoggingClause();
 
             lexer.nextToken();
diff --git a/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java b/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
index 064e263f87..55cc811f7b 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java
@@ -217,12 +217,9 @@ public class SQLExprParser extends SQLParser {
             case REFERENCE:
             case KEY:
             case DISTINCT:
-            case TIME:
             case ZONE:
-            case LOG:
             case LIMIT:
             case SCHEMA:
-            case AT:
             case COLUMN:
             case IF:
                 sqlExpr = new SQLIdentifierExpr(lexer.stringVal());
diff --git a/src/main/java/com/alibaba/druid/sql/parser/SQLParser.java b/src/main/java/com/alibaba/druid/sql/parser/SQLParser.java
index 448174b653..2434890423 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/SQLParser.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/SQLParser.java
@@ -96,8 +96,7 @@ public class SQLParser {
         } else if (lexer.token() == Token.LITERAL_CHARS) {
             alias = "'" + lexer.stringVal() + "'";
             lexer.nextToken();
-        } else if (lexer.token() == Token.TIME || lexer.token() == Token.CASE || lexer.token() == Token.AT
-                   || lexer.token() == Token.LOG) {
+        } else if (lexer.token() == Token.CASE) {
             alias = lexer.token.name();
             lexer.nextToken();
         }
diff --git a/src/main/java/com/alibaba/druid/sql/parser/Token.java b/src/main/java/com/alibaba/druid/sql/parser/Token.java
index 06e9442827..cd52e63382 100644
--- a/src/main/java/com/alibaba/druid/sql/parser/Token.java
+++ b/src/main/java/com/alibaba/druid/sql/parser/Token.java
@@ -145,7 +145,6 @@ public enum Token {
     MODEL("MODEL"),
     MERGE("MERGE"),
     MATCHED("MATCHED"),
-    LOG("LOG"),
     ERRORS("ERRORS"),
     REJECT("REJECT"),
     UNLIMITED("UNLIMITED"),
@@ -156,9 +155,7 @@ public enum Token {
     ADVISE("ADVISE"),
     SESSION("SESSION"),
     PROCEDURE("PROCEDURE"),
-    AT("AT"),
     LOCAL("LOCAL"),
-    TIME("TIME"),
     ZONE("ZONE"),
     SYSDATE("SYSDATE"),
     DECLARE("DECLARE"),