diff --git a/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleConnector.java b/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleConnector.java
index 8b6ac80c6..fdc099cbf 100644
--- a/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleConnector.java
+++ b/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleConnector.java
@@ -87,6 +87,10 @@ protected void setConnectorSpec(ConnectorSpecRequest request, DBConnectorPath pa
     sourceProperties.put(OracleSource.OracleSourceConfig.NUM_SPLITS, "1");
     sourceProperties.put(OracleSource.OracleSourceConfig.FETCH_SIZE,
                          OracleSource.OracleSourceConfig.DEFAULT_FETCH_SIZE);
+    sourceProperties.put(OracleConstants.DEFAULT_ROW_PREFETCH,
+                         OracleSource.OracleSourceConfig.DEFAULT_ROW_PREFETCH_VALUE);
+    sourceProperties.put(OracleConstants.DEFAULT_BATCH_VALUE,
+                         OracleSource.OracleSourceConfig.DEFAULT_BATCH_SIZE);
     String table = path.getTable();
     if (table == null) {
       return;
diff --git a/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleSource.java b/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleSource.java
index 4dafdf95b..5dd5c33c8 100644
--- a/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleSource.java
+++ b/oracle-plugin/src/main/java/io/cdap/plugin/oracle/OracleSource.java
@@ -73,6 +73,8 @@ public static class OracleSourceConfig extends AbstractDBSpecificSourceConfig {
 
     public static final String NAME_USE_CONNECTION = "useConnection";
     public static final String NAME_CONNECTION = "connection";
+    public static final String DEFAULT_ROW_PREFETCH_VALUE = "40";
+    public static final String DEFAULT_BATCH_SIZE = "10";
 
     @Name(NAME_USE_CONNECTION)
     @Nullable
@@ -88,12 +90,12 @@ public static class OracleSourceConfig extends AbstractDBSpecificSourceConfig {
     @Name(OracleConstants.DEFAULT_BATCH_VALUE)
     @Description("The default batch value that triggers an execution request.")
     @Nullable
-    public Integer defaultBatchValue;
+    private Integer defaultBatchValue;
 
     @Name(OracleConstants.DEFAULT_ROW_PREFETCH)
     @Description("The default number of rows to prefetch from the server.")
     @Nullable
-    public Integer defaultRowPrefetch;
+    private Integer defaultRowPrefetch;
 
     @Override
     public String getConnectionString() {
@@ -111,9 +113,12 @@ public String getConnectionString() {
     @Override
     protected Map<String, String> getDBSpecificArguments() {
       ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();
-
-      builder.put(OracleConstants.DEFAULT_BATCH_VALUE, String.valueOf(defaultBatchValue));
-      builder.put(OracleConstants.DEFAULT_ROW_PREFETCH, String.valueOf(defaultRowPrefetch));
+      if (defaultBatchValue != null) {
+        builder.put(OracleConstants.DEFAULT_BATCH_VALUE, String.valueOf(defaultBatchValue));
+      }
+      if (defaultRowPrefetch != null) {
+        builder.put(OracleConstants.DEFAULT_ROW_PREFETCH, String.valueOf(defaultRowPrefetch));
+      }
 
       return builder.build();
     }