diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/auth/ResourceObject.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/auth/ResourceObject.java
index b3bb609e5d..bdff3b38d4 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/auth/ResourceObject.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/auth/ResourceObject.java
@@ -58,8 +58,17 @@ public String toString() {
         if (this.type.isAuth()) {
             operated = ((AuthElement) this.operated).idString();
         }
-        return String.format("Resource{graph=%s,type=%s,operated=%s}",
-                             this.graph, this.type, operated);
+
+        String typeStr = this.type.toString();
+        String operatedStr = operated.toString();
+        int capacity = this.graph.length() + typeStr.length() +
+                       operatedStr.length() + 36;
+
+        StringBuilder sb = new StringBuilder(capacity);
+        return sb.append("Resource{graph=").append(this.graph)
+                 .append(",type=").append(typeStr)
+                 .append(",operated=").append(operatedStr)
+                 .append("}").toString();
     }
 
     public static ResourceObject<SchemaElement> of(String graph,
diff --git a/hugegraph-dist/src/assembly/static/conf/log4j2.xml b/hugegraph-dist/src/assembly/static/conf/log4j2.xml
index 07621ed182..83e0598e1c 100644
--- a/hugegraph-dist/src/assembly/static/conf/log4j2.xml
+++ b/hugegraph-dist/src/assembly/static/conf/log4j2.xml
@@ -7,13 +7,26 @@
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
         </Console>
 
-        <RollingFile name="file" fileName="logs/hugegraph-server.log"
-                     filePattern="logs/$${date:yyyy-MM}/hugegraph-server-%d{yyyy-MM-dd}-%i.log">
+        <!-- Normal server log config -->
+        <RollingRandomAccessFile name="file" fileName="logs/hugegraph-server.log"
+            filePattern="logs/$${date:yyyy-MM}/hugegraph-server-%d{yyyy-MM-dd}-%i.log"
+            immediateFlush="false">
             <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
             <SizeBasedTriggeringPolicy size="50MB"/>
-        </RollingFile>
+        </RollingRandomAccessFile>
+
+        <!-- Separate audit log, buffer size is 512KB -->
+        <RollingRandomAccessFile name="audit" fileName="logs/audit-hugegraph-server.log"
+            filePattern="logs/$${date:yyyy-MM}/audit-hugegraph-server-%d{yyyy-MM-dd}-%i.log"
+            bufferSize="524288" immediateFlush="false">
+            <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
+            <!-- Use simple format for audit log to speed up -->
+            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} - %m%n"/>
+            <SizeBasedTriggeringPolicy size="50MB"/>
+        </RollingRandomAccessFile>
     </appenders>
+
     <loggers>
         <root level="INFO">
             <appender-ref ref="file"/>
@@ -39,8 +52,12 @@
         <logger name="org.apache.commons" level="INFO" additivity="false">
             <appender-ref ref="file"/>
         </logger>
-        <logger name="com.baidu.hugegraph" level="INFO" additivity="false">
+        <!-- Use mixed async way to output logs -->
+        <AsyncLogger name="com.baidu.hugegraph" level="INFO" additivity="false">
             <appender-ref ref="file"/>
-        </logger>
+        </AsyncLogger>
+        <AsyncLogger name="com.baidu.hugegraph.auth" level="INFO" additivity="false">
+            <appender-ref ref="audit"/>
+        </AsyncLogger>
     </loggers>
 </configuration>
diff --git a/hugegraph-dist/src/main/resources/log4j2.xml b/hugegraph-dist/src/main/resources/log4j2.xml
index 10f10c7662..39971f2f0a 100644
--- a/hugegraph-dist/src/main/resources/log4j2.xml
+++ b/hugegraph-dist/src/main/resources/log4j2.xml
@@ -7,13 +7,26 @@
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
         </Console>
 
-        <RollingFile name="file" fileName="logs/hugegraph-server.log"
-                     filePattern="logs/$${date:yyyy-MM}/hugegraph-server-%d{yyyy-MM-dd}-%i.log">
+        <!-- Normal server log config -->
+        <RollingRandomAccessFile name="file" fileName="logs/hugegraph-server.log"
+            filePattern="logs/$${date:yyyy-MM}/hugegraph-server-%d{yyyy-MM-dd}-%i.log"
+            immediateFlush="false">
             <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
             <SizeBasedTriggeringPolicy size="50MB"/>
-        </RollingFile>
+        </RollingRandomAccessFile>
+
+        <!-- Separate audit log, buffer size is 512KB -->
+        <RollingRandomAccessFile name="audit" fileName="logs/audit-hugegraph-server.log"
+            filePattern="logs/$${date:yyyy-MM}/audit-hugegraph-server-%d{yyyy-MM-dd}-%i.log"
+            bufferSize="524288" immediateFlush="false">
+            <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
+            <!-- Use simple format for audit log to speed up -->
+            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} - %m%n"/>
+            <SizeBasedTriggeringPolicy size="50MB"/>
+        </RollingRandomAccessFile>
     </appenders>
+
     <loggers>
         <root level="INFO">
             <appender-ref ref="console"/>
@@ -47,9 +60,14 @@
             <appender-ref ref="console"/>
             <appender-ref ref="file"/>
         </logger>
-        <logger name="com.baidu.hugegraph" level="INFO" additivity="false">
+        <!-- Use mixed async way to output logs -->
+        <AsyncLogger name="com.baidu.hugegraph" level="INFO" additivity="false">
             <appender-ref ref="console"/>
             <appender-ref ref="file"/>
-        </logger>
+        </AsyncLogger>
+        <AsyncLogger name="com.baidu.hugegraph.auth" level="INFO" additivity="false">
+            <appender-ref ref="console"/>
+            <appender-ref ref="audit"/>
+        </AsyncLogger>
     </loggers>
 </configuration>
diff --git a/hugegraph-example/src/main/resources/log4j2.xml b/hugegraph-example/src/main/resources/log4j2.xml
index 5a705332ff..84511f69c4 100644
--- a/hugegraph-example/src/main/resources/log4j2.xml
+++ b/hugegraph-example/src/main/resources/log4j2.xml
@@ -7,13 +7,26 @@
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
         </Console>
 
-        <RollingFile name="file" fileName="logs/hugegraph-example.log"
-                     filePattern="logs/$${date:yyyy-MM}/hugegraph-example-%d{yyyy-MM-dd}-%i.log">
+        <!-- Normal server log config -->
+        <RollingRandomAccessFile name="file" fileName="logs/hugegraph-example.log"
+            filePattern="logs/$${date:yyyy-MM}/hugegraph-example-%d{yyyy-MM-dd}-%i.log"
+            immediateFlush="false">
             <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
             <SizeBasedTriggeringPolicy size="50MB"/>
-        </RollingFile>
+        </RollingRandomAccessFile>
+
+        <!-- Separate audit log, buffer size is 512KB -->
+        <RollingRandomAccessFile name="audit" fileName="logs/audit-hugegraph-example.log"
+            filePattern="logs/$${date:yyyy-MM}/audit-hugegraph-example-%d{yyyy-MM-dd}-%i.log"
+            bufferSize="524288" immediateFlush="false">
+            <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
+            <!-- Use simple format for audit log to speed up -->
+            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} - %m%n"/>
+            <SizeBasedTriggeringPolicy size="50MB"/>
+        </RollingRandomAccessFile>
     </appenders>
+
     <loggers>
         <root level="INFO">
             <appender-ref ref="console"/>
@@ -47,9 +60,14 @@
             <appender-ref ref="console"/>
             <appender-ref ref="file"/>
         </logger>
-        <logger name="com.baidu.hugegraph" level="INFO" additivity="false">
+        <!-- Use mixed async way to output logs -->
+        <AsyncLogger name="com.baidu.hugegraph" level="INFO" additivity="false">
             <appender-ref ref="console"/>
             <appender-ref ref="file"/>
-        </logger>
+        </AsyncLogger>
+        <AsyncLogger name="com.baidu.hugegraph.auth" level="INFO" additivity="false">
+            <appender-ref ref="console"/>
+            <appender-ref ref="audit"/>
+        </AsyncLogger>
     </loggers>
 </configuration>
diff --git a/hugegraph-test/src/main/resources/log4j2.xml b/hugegraph-test/src/main/resources/log4j2.xml
index 5881345a7e..64fb5180b1 100644
--- a/hugegraph-test/src/main/resources/log4j2.xml
+++ b/hugegraph-test/src/main/resources/log4j2.xml
@@ -7,13 +7,26 @@
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
         </Console>
 
-        <RollingFile name="file" fileName="logs/hugegraph-test.log"
-                     filePattern="logs/$${date:yyyy-MM}/hugegraph-test-%d{yyyy-MM-dd}-%i.log">
+        <!-- Normal server log config -->
+        <RollingRandomAccessFile name="file" fileName="logs/hugegraph-test.log"
+            filePattern="logs/$${date:yyyy-MM}/hugegraph-test-%d{yyyy-MM-dd}-%i.log"
+            immediateFlush="false">
             <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
             <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} %-5r [%t] [%-5p] %c %x - %m%n"/>
             <SizeBasedTriggeringPolicy size="50MB"/>
-        </RollingFile>
+        </RollingRandomAccessFile>
+
+        <!-- Separate audit log, buffer size is 512KB -->
+        <RollingRandomAccessFile name="audit" fileName="logs/audit-hugegraph-test.log"
+            filePattern="logs/$${date:yyyy-MM}/audit-hugegraph-test-%d{yyyy-MM-dd}-%i.log"
+            bufferSize="524288" immediateFlush="false">
+            <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/>
+            <!-- Use simple format for audit log to speed up -->
+            <PatternLayout pattern="%-d{yyyy-MM-dd HH:mm:ss} - %m%n"/>
+            <SizeBasedTriggeringPolicy size="50MB"/>
+        </RollingRandomAccessFile>
     </appenders>
+
     <loggers>
         <root level="INFO">
             <appender-ref ref="console"/>
@@ -47,9 +60,14 @@
             <appender-ref ref="console"/>
             <appender-ref ref="file"/>
         </logger>
-        <logger name="com.baidu.hugegraph" level="INFO" additivity="false">
+        <!-- Use mixed async way to output logs -->
+        <AsyncLogger name="com.baidu.hugegraph" level="INFO" additivity="false">
             <appender-ref ref="console"/>
             <appender-ref ref="file"/>
-        </logger>
+        </AsyncLogger>
+        <AsyncLogger name="com.baidu.hugegraph.auth" level="INFO" additivity="false">
+            <appender-ref ref="console"/>
+            <appender-ref ref="audit"/>
+        </AsyncLogger>
     </loggers>
 </configuration>