diff --git a/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/config/MappingConfig.java b/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/config/MappingConfig.java
index ce1b9f15..5c0e9f9f 100644
--- a/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/config/MappingConfig.java
+++ b/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/config/MappingConfig.java
@@ -1,5 +1,7 @@
 package com.alibaba.otter.canal.client.adapter.rdb.config;
 
+import org.apache.commons.lang.StringUtils;
+
 import java.util.LinkedHashMap;
 import java.util.Map;
 
@@ -92,7 +94,7 @@ public class MappingConfig {
         private Map<String, String> allMapColumns;
 
         public Boolean getMirrorDb() {
-            return mirrorDb;
+            return mirrorDb == null ? false : mirrorDb;
         }
 
         public void setMirrorDb(Boolean mirrorDb) {
@@ -148,6 +150,13 @@ public class MappingConfig {
         }
 
         public Map<String, String> getTargetColumns() {
+            if (targetColumns != null) {
+                targetColumns.forEach((key, value) -> {
+                    if (StringUtils.isEmpty(value)) {
+                        targetColumns.put(key, key);
+                    }
+                });
+            }
             return targetColumns;
         }
 
diff --git a/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/monitor/RdbConfigMonitor.java b/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/monitor/RdbConfigMonitor.java
index 271f1393..e337b829 100644
--- a/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/monitor/RdbConfigMonitor.java
+++ b/client-adapter/rdb/src/main/java/com/alibaba/otter/canal/client/adapter/rdb/monitor/RdbConfigMonitor.java
@@ -4,7 +4,6 @@ import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
 
-import com.alibaba.otter.canal.client.adapter.rdb.config.MirrorDbConfig;
 import org.apache.commons.io.filefilter.FileFilterUtils;
 import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
 import org.apache.commons.io.monitor.FileAlterationMonitor;
@@ -16,6 +15,7 @@ import org.yaml.snakeyaml.Yaml;
 
 import com.alibaba.otter.canal.client.adapter.rdb.RdbAdapter;
 import com.alibaba.otter.canal.client.adapter.rdb.config.MappingConfig;
+import com.alibaba.otter.canal.client.adapter.rdb.config.MirrorDbConfig;
 import com.alibaba.otter.canal.client.adapter.support.MappingConfigsLoader;
 import com.alibaba.otter.canal.client.adapter.support.Util;
 
@@ -121,18 +121,23 @@ public class RdbConfigMonitor {
         }
 
         private void addConfigToCache(File file, MappingConfig mappingConfig) {
-            rdbAdapter.getRdbMapping().put(file.getName(), mappingConfig);
-            Map<String, MappingConfig> configMap = rdbAdapter.getMappingConfigCache()
-                .computeIfAbsent(StringUtils.trimToEmpty(mappingConfig.getDestination()) + "."
-                                 + mappingConfig.getDbMapping().getDatabase() + "."
-                                 + mappingConfig.getDbMapping().getTable(),
-                    k1 -> new HashMap<>());
-            configMap.put(file.getName(), mappingConfig);
-
-            Map<String, MirrorDbConfig> mirrorDbConfigCache = rdbAdapter.getMirrorDbConfigCache();
-            mirrorDbConfigCache.put(StringUtils.trimToEmpty(mappingConfig.getDestination()) + "."
-                                    + mappingConfig.getDbMapping().getDatabase(),
-                MirrorDbConfig.create(file.getName(), mappingConfig));
+            MappingConfig.DbMapping dbMapping = mappingConfig.getDbMapping();
+            if (dbMapping != null) {
+                if (!dbMapping.getMirrorDb()) {
+                    rdbAdapter.getRdbMapping().put(file.getName(), mappingConfig);
+                    Map<String, MappingConfig> configMap = rdbAdapter.getMappingConfigCache()
+                        .computeIfAbsent(StringUtils.trimToEmpty(mappingConfig.getDestination()) + "."
+                                         + mappingConfig.getDbMapping().getDatabase() + "."
+                                         + mappingConfig.getDbMapping().getTable(),
+                            k1 -> new HashMap<>());
+                    configMap.put(file.getName(), mappingConfig);
+                } else {
+                    Map<String, MirrorDbConfig> mirrorDbConfigCache = rdbAdapter.getMirrorDbConfigCache();
+                    mirrorDbConfigCache.put(StringUtils.trimToEmpty(mappingConfig.getDestination()) + "."
+                                            + mappingConfig.getDbMapping().getDatabase(),
+                        MirrorDbConfig.create(file.getName(), mappingConfig));
+                }
+            }
         }
 
         private void deleteConfigFromCache(File file) {