Progress Bar not animating while inserting data in Database using AsyncTask

I have edittext and button to insert data,when i click the button i am hiding the button and edittext and showing a ProgressBar.I am using AsyncTask to insert data in sqlite database, but the problem is, While performing background task,the ProgressBar is not animating.I am using progressbar with intermediateDrawable.

NOTE: ProgressBar is animating Perfectly in other classes,but when i insert data in database, its showing but not animating.

ProgressBar

<ProgressBar
        android:id="@+id/pb"
        android:visibility="gone"         
        android:layout_centerInParent="true"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="@dimen/viewSpace3"
        android:indeterminateDrawable="@drawable/loader_0_1" />  

loader_0_1.xml

<rotate xmlns:android="http://ift.tt/nIICcg"
android:fromDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:toDegrees="360" >

<shape
    android:innerRadiusRatio="3"
    android:shape="oval"
    android:thicknessRatio="8"
    android:useLevel="false" >
    <size
        android:height="48dip"
        android:width="48dip" />

    <gradient
        android:centerColor="#FFFFFF"
        android:centerY="0.50"
        android:endColor="#0B95B9"
        android:startColor="#FFFFFF"
        android:type="sweep"
        android:useLevel="false" />
</shape>

In preExecute of AsyncTask i am hiding other widgets and showing progressBar pb, using

 pb.setVisibility(View.VISIBLE);

In doInBackground, i am inserting data in database using cursor

In PostExecute, i am hiding progressBar and showing other widgets

pb.setVisibility(View.GONE);

Is that a memory or RAM issue that doesn't allow progressBar to Animate while working with Databases...?