diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientEventBatchService.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientEventBatchService.java
index 0a3fe8ac..3a3852b0 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientEventBatchService.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/SEBClientEventBatchService.java
@@ -79,7 +79,7 @@ public class SEBClientEventBatchService {
     }
 
     private final BlockingDeque<EventData> eventDataQueue = new LinkedBlockingDeque<>();
-    private final Collection<EventData> events = new ArrayList<>();
+    //private final Collection<EventData> events = new ArrayList<>();
 
     public void accept(final String connectionToken, final String jsonBody) {
         this.eventDataQueue.add(new EventData(
@@ -92,14 +92,58 @@ public class SEBClientEventBatchService {
         this.eventDataQueue.add(eventData);
     }
 
+    private final Collection<EventData> events1 = new ArrayList<>();
+
     @Scheduled(
             fixedDelayString = "${sebserver.webservice.api.exam.session.event.batch.interval:1000}",
             initialDelay = 100)
-    public void processEvents() {
+    public void worker1() {
+        processEvents("worker1", this.events1);
+    }
+
+    private final Collection<EventData> events2 = new ArrayList<>();
+
+    @Scheduled(
+            fixedDelayString = "${sebserver.webservice.api.exam.session.event.batch.interval:1000}",
+            initialDelay = 300)
+    public void worker2() {
+        processEvents("worker2", this.events2);
+    }
+
+    private final Collection<EventData> events3 = new ArrayList<>();
+
+    @Scheduled(
+            fixedDelayString = "${sebserver.webservice.api.exam.session.event.batch.interval:1000}",
+            initialDelay = 600)
+    public void worker3() {
+        processEvents("worker3", this.events3);
+    }
+
+    private final Collection<EventData> events4 = new ArrayList<>();
+
+    @Scheduled(
+            fixedDelayString = "${sebserver.webservice.api.exam.session.event.batch.interval:1000}",
+            initialDelay = 900)
+    public void worker4() {
+        processEvents("worker4", this.events4);
+    }
+
+    public void processOneTime() {
+        processEvents("One Time Call", new ArrayList<>());
+    }
+
+    private void processEvents(final String workerName, final Collection<EventData> events) {
+
+        long start = 0L;
+        if (log.isDebugEnabled()) {
+            start = Utils.getMillisecondsNow();
+        }
 
         final int size = this.eventDataQueue.size();
         if (size > 1000) {
-            log.warn("-----> There are more then 1000 SEB client logs in the waiting queue: {}", size);
+            log.warn("-----> There are more then 1000 SEB client logs in the waiting queue: {}, worker: {}",
+                    size,
+                    workerName);
         }
 
         if (size == 0) {
@@ -108,14 +152,14 @@ public class SEBClientEventBatchService {
 
         try {
 
-            this.events.clear();
-            this.eventDataQueue.drainTo(this.events);
+            events.clear();
+            this.eventDataQueue.drainTo(events);
 
-            if (this.events.isEmpty()) {
+            if (events.isEmpty()) {
                 return;
             }
 
-            final List<ClientEventRecord> events = this.events
+            final List<ClientEventRecord> records = events
                     .stream()
                     .map(this::convertData)
                     .map(this::storeNotifications)
@@ -126,12 +170,19 @@ public class SEBClientEventBatchService {
 
             this.transactionTemplate
                     .execute(status -> {
-                        events.stream().forEach(this.clientEventMapper::insert);
+                        records.stream().forEach(this.clientEventMapper::insert);
                         return null;
                     });
 
             this.sqlSessionTemplate.flushStatements();
 
+            if (log.isDebugEnabled()) {
+                log.debug("SEBClientEventBatchService worker {} processes batch of size {} in {} ms",
+                        workerName,
+                        size,
+                        start - Utils.getMillisecondsNow());
+            }
+
         } catch (final Exception e) {
             log.error("Failed to process SEB events from eventDataQueue: ", e);
         }
@@ -200,7 +251,7 @@ public class SEBClientEventBatchService {
             return null;
 
         } catch (final Exception e) {
-            log.error("Failed to verify and process notification for SEB event: {}", eventData);
+            log.error("Failed to verify and process notification for SEB event: {}", eventData, e);
             return eventData;
         }
     }
diff --git a/src/test/java/ch/ethz/seb/sebserver/webservice/integration/api/exam/SebConnectionTest.java b/src/test/java/ch/ethz/seb/sebserver/webservice/integration/api/exam/SebConnectionTest.java
index f7baae0f..88b30db6 100644
--- a/src/test/java/ch/ethz/seb/sebserver/webservice/integration/api/exam/SebConnectionTest.java
+++ b/src/test/java/ch/ethz/seb/sebserver/webservice/integration/api/exam/SebConnectionTest.java
@@ -561,7 +561,7 @@ public class SebConnectionTest extends ExamAPIIntegrationTester {
         // check correct response
         assertTrue(HttpStatus.NO_CONTENT.value() == sendEvent.getStatus());
 
-        this.sebClientEventBatchStore.processEvents();
+        this.sebClientEventBatchStore.processOneTime();
 
         // check event stored on db
         List<ClientEventRecord> events = this.clientEventRecordMapper
@@ -587,7 +587,7 @@ public class SebConnectionTest extends ExamAPIIntegrationTester {
                 10000.0,
                 "testEvent2");
 
-        this.sebClientEventBatchStore.processEvents();
+        this.sebClientEventBatchStore.processOneTime();
         // check correct response
         assertTrue(HttpStatus.NO_CONTENT.value() == sendEvent.getStatus());
 
@@ -622,7 +622,7 @@ public class SebConnectionTest extends ExamAPIIntegrationTester {
                 "testEvent1");
         // check correct response
         assertTrue(HttpStatus.NO_CONTENT.value() == sendEvent.getStatus());
-        this.sebClientEventBatchStore.processEvents();
+        this.sebClientEventBatchStore.processOneTime();
         final List<ClientEventRecord> events = this.clientEventRecordMapper
                 .selectByExample()
                 .build()
diff --git a/src/test/java/ch/ethz/seb/sebserver/webservice/integration/services/ClientEventServiceTest.java b/src/test/java/ch/ethz/seb/sebserver/webservice/integration/services/ClientEventServiceTest.java
index 075099b6..d2002e38 100644
--- a/src/test/java/ch/ethz/seb/sebserver/webservice/integration/services/ClientEventServiceTest.java
+++ b/src/test/java/ch/ethz/seb/sebserver/webservice/integration/services/ClientEventServiceTest.java
@@ -210,7 +210,7 @@ public class ClientEventServiceTest extends AdministrationAPIIntegrationTester {
     }
 
     private void waitForExecutor() {
-        this.sebClientEventBatchStore.processEvents();
+        this.sebClientEventBatchStore.processOneTime();
     }
 
     @Test