Index: main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/HTTPServerOnlyResourceStatisticsFactory.java
===================================================================
--- main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/HTTPServerOnlyResourceStatisticsFactory.java	(revision 21270)
+++ main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/HTTPServerOnlyResourceStatisticsFactory.java	(working copy)
@@ -21,6 +21,7 @@
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -152,12 +153,16 @@
     public int purgeRawData() throws SQLException
     {
         Connection connection = null;
-        Statement stmt = null;
+        PreparedStatement stmt = null;
         try
         {
             connection = ConnectionHelper.getConnection(Constants.MONITORING_DATASOURCE_POOLNAME);
-            stmt = connection.createStatement();
-            return stmt.executeUpdate("DELETE FROM " + Constants.__SQL_TABLE_NAME_HTTPSERVER_ACCESS + " WHERE PROCESSED = 1");
+            stmt = connection.prepareStatement("DELETE FROM " + Constants.__SQL_TABLE_NAME_HTTPSERVER_ACCESS + " WHERE PROCESSED = 1 OR Created_At < ?");
+            
+            Timestamp purgeThreshold = new Timestamp(System.currentTimeMillis() - 24 * 60 * 60 * 1000);
+            stmt.setTimestamp(1, purgeThreshold);
+            
+            return stmt.executeUpdate();
         }
         finally
         {
Index: main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/PageElementResourceStatisticsFactory.java
===================================================================
--- main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/PageElementResourceStatisticsFactory.java	(revision 21270)
+++ main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/PageElementResourceStatisticsFactory.java	(working copy)
@@ -21,6 +21,7 @@
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -111,12 +112,16 @@
     public int purgeRawData() throws SQLException
     {
         Connection connection = null;
-        Statement stmt = null;
+        PreparedStatement stmt = null;
         try
         {
             connection = ConnectionHelper.getConnection(Constants.MONITORING_DATASOURCE_POOLNAME);
-            stmt = connection.createStatement();
-            return stmt.executeUpdate("DELETE FROM " + Constants.__SQL_TABLE_NAME_PAGE_ELEMENTS_ACCESS + " WHERE PROCESSED = 1");
+            stmt = connection.prepareStatement("DELETE FROM " + Constants.__SQL_TABLE_NAME_PAGE_ELEMENTS_ACCESS + " WHERE PROCESSED = 1 OR Created_At < ?");
+            
+            Timestamp purgeThreshold = new Timestamp(System.currentTimeMillis() - 24 * 60 * 60 * 1000);
+            stmt.setTimestamp(1, purgeThreshold);
+            
+            return stmt.executeUpdate();
         }
         finally
         {
Index: main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/PageResourceStatisticsFactory.java
===================================================================
--- main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/PageResourceStatisticsFactory.java	(revision 21270)
+++ main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/PageResourceStatisticsFactory.java	(working copy)
@@ -21,6 +21,7 @@
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -158,12 +159,16 @@
     public int purgeRawData() throws SQLException
     {
         Connection connection = null;
-        Statement stmt = null;
+        PreparedStatement stmt = null;
         try
         {
             connection = ConnectionHelper.getConnection(Constants.MONITORING_DATASOURCE_POOLNAME);
-            stmt = connection.createStatement();
-            return stmt.executeUpdate("DELETE FROM " + Constants.__SQL_TABLE_NAME_PAGE_ACCESS + " WHERE PROCESSED = 1");
+            stmt = connection.prepareStatement("DELETE FROM " + Constants.__SQL_TABLE_NAME_PAGE_ACCESS + " WHERE PROCESSED = 1 OR Created_At < ?");
+            
+            Timestamp purgeThreshold = new Timestamp(System.currentTimeMillis() - 24 * 60 * 60 * 1000);
+            stmt.setTimestamp(1, purgeThreshold);
+            
+            return stmt.executeUpdate();
         }
         finally
         {
Index: main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/FrontOnlyResourceStatisticsFactory.java
===================================================================
--- main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/FrontOnlyResourceStatisticsFactory.java	(revision 21270)
+++ main/plugin-web/src/org/ametys/web/cache/monitoring/process/statistics/impl/FrontOnlyResourceStatisticsFactory.java	(working copy)
@@ -21,6 +21,7 @@
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
+import java.sql.Timestamp;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -156,12 +157,16 @@
     public int purgeRawData() throws SQLException
     {
         Connection connection = null;
-        Statement stmt = null;
+        PreparedStatement stmt = null;
         try
         {
             connection = ConnectionHelper.getConnection(Constants.MONITORING_DATASOURCE_POOLNAME);
-            stmt = connection.createStatement();
-            return stmt.executeUpdate("DELETE FROM " + Constants.__SQL_TABLE_NAME_FRONT_ACCESS + " WHERE PROCESSED = 1");
+            stmt = connection.prepareStatement("DELETE FROM " + Constants.__SQL_TABLE_NAME_FRONT_ACCESS + " WHERE PROCESSED = 1 OR Created_At < ?");
+            
+            Timestamp purgeThreshold = new Timestamp(System.currentTimeMillis() - 24 * 60 * 60 * 1000);
+            stmt.setTimestamp(1, purgeThreshold);
+            
+            return stmt.executeUpdate();
         }
         finally
         {