diff --git a/apache2/apache2_config.c b/apache2/apache2_config.c
index ebc55e64..04527931 100644
--- a/apache2/apache2_config.c
+++ b/apache2/apache2_config.c
@@ -126,6 +126,9 @@ void *create_directory_config(apr_pool_t *mp, char *path)
     dcfg->request_encoding = NOT_SET_P;
     dcfg->disable_backend_compression = NOT_SET;
 
+    /* Collection timeout */
+    dcfg->col_timeout = NOT_SET;
+
     return dcfg;
 }
 
@@ -515,6 +518,9 @@ void *merge_directory_configs(apr_pool_t *mp, void *_parent, void *_child)
     merged->disable_backend_compression = (child->disable_backend_compression == NOT_SET
         ? parent->disable_backend_compression : child->disable_backend_compression);
 
+    merged->col_timeout = (child->col_timeout == NOT_SET
+        ? parent->col_timeout : child->col_timeout);
+
     return merged;
 }
 
@@ -611,6 +617,8 @@ void init_directory_config(directory_config *dcfg)
     if (dcfg->request_encoding == NOT_SET_P) dcfg->request_encoding = NULL;
 
     if (dcfg->disable_backend_compression == NOT_SET) dcfg->disable_backend_compression = 0;
+
+    if (dcfg->col_timeout == NOT_SET) dcfg->col_timeout = 3600;
 }
 
 /**
@@ -1253,6 +1261,18 @@ static const char *cmd_debug_log(cmd_parms *cmd, void *_dcfg, const char *p1)
     return NULL;
 }
 
+static const char *cmd_collection_timeout(cmd_parms *cmd, void *_dcfg,
+                                       const char *p1)
+{
+    directory_config *dcfg = (directory_config *)_dcfg;
+
+    dcfg->col_timeout = atoi(p1);
+    /* max 30 days */
+    if ((dcfg->col_timeout >= 0)&&(dcfg->col_timeout <= 2592000)) return NULL;
+
+    return apr_psprintf(cmd->pool, "ModSecurity: Invalid value for SecDefaultCollectionTimeout: %s", p1);
+}
+
 static const char *cmd_debug_log_level(cmd_parms *cmd, void *_dcfg,
                                        const char *p1)
 {
@@ -2348,6 +2368,14 @@ const command_rec module_directives[] = {
         " Use values from 0 (no logging) to 9 (a *lot* of logging)."
     ),
 
+    AP_INIT_TAKE1 (
+        "SecDefaultCollectionTimeout",
+        cmd_collection_timeout,
+        NULL,
+        CMD_SCOPE_ANY,
+        "set default collections timeout. default it 3600"
+    ),
+
     AP_INIT_TAKE1 (
         "SecDefaultAction",
         cmd_default_action,
diff --git a/apache2/modsecurity.c b/apache2/modsecurity.c
index d06ca3cc..11615c29 100644
--- a/apache2/modsecurity.c
+++ b/apache2/modsecurity.c
@@ -212,28 +212,30 @@ static void modsecurity_persist_data(modsec_rec *msr) {
     }
 
     time_after = apr_time_now();
-    
+
     msr->time_storage_write += time_after - time_before;
-    
+
     if (msr->txcfg->debuglog_level >= 4) {
         msr_log(msr, 4, "Recording persistent data took %" APR_TIME_T_FMT
             " microseconds.", msr->time_gc);
-    }   
-    
+    }
+
     /* Remove stale collections. */
+    srand(time(NULL));
+
     if (rand() < RAND_MAX/100) {
         arr = apr_table_elts(msr->collections);
         te = (apr_table_entry_t *)arr->elts;
         for (i = 0; i < arr->nelts; i++) {
             collections_remove_stale(msr, te[i].key);
         }
-        
+
         msr->time_gc = apr_time_now() - time_after;
-        
+
         if (msr->txcfg->debuglog_level >= 4) {
             msr_log(msr, 4, "Garbage collection took %" APR_TIME_T_FMT
                 " microseconds.", msr->time_gc);
-        }   
+        }
     }
 }
 
diff --git a/apache2/modsecurity.h b/apache2/modsecurity.h
index 6db74202..86508d6e 100644
--- a/apache2/modsecurity.h
+++ b/apache2/modsecurity.h
@@ -518,8 +518,11 @@ struct directory_config {
 
     /* Request character encoding. */
     const char          *request_encoding;
-    
+
     int disable_backend_compression;
+
+    /* Collection timeout */
+    int col_timeout;
 };
 
 struct error_message {
diff --git a/apache2/persist_dbm.c b/apache2/persist_dbm.c
index fd511e41..39982390 100644
--- a/apache2/persist_dbm.c
+++ b/apache2/persist_dbm.c
@@ -108,7 +108,10 @@ static apr_table_t *collection_retrieve_ex(apr_sdbm_t *existing_dbm, modsec_rec
         goto cleanup;
     }
 
-    dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", col_name, NULL);
+    if(strstr(col_name,"USER") || strstr(col_name,"SESSION"))
+        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", msr->txcfg->webappid, "_", col_name, NULL);
+    else
+        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", col_name, NULL);
 
     key.dptr = (char *)col_key;
     key.dsize = col_key_len + 1;
@@ -576,7 +579,10 @@ int collections_remove_stale(modsec_rec *msr, const char *col_name) {
         goto error;
     }
 
-    dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", col_name, NULL);
+    if(strstr(col_name,"USER") || strstr(col_name,"SESSION"))
+        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", msr->txcfg->webappid, "_", col_name, NULL);
+    else
+        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", col_name, NULL);
 
     rc = apr_sdbm_open(&dbm, dbm_filename, APR_CREATE | APR_WRITE | APR_SHARELOCK,
         CREATEMODE, msr->mp);
diff --git a/apache2/re_actions.c b/apache2/re_actions.c
index eaa69bde..0607fe23 100644
--- a/apache2/re_actions.c
+++ b/apache2/re_actions.c
@@ -1730,7 +1730,7 @@ static apr_status_t init_collection(modsec_rec *msr, const char *real_col_name,
 
     if (table == NULL) {
         /* Does not exist yet - create new. */
-        
+
         if (msr->txcfg->debuglog_level >= 4) {
             msr_log(msr, 4, "Creating collection (name \"%s\", key \"%s\").",
                real_col_name, col_key);
@@ -1741,6 +1741,10 @@ static apr_status_t init_collection(modsec_rec *msr, const char *real_col_name,
 
         /* IMP1 Is the timeout hard-coded to 3600? */
 
+       if(msr->txcfg->debuglog_level >= 4) {
+            msr_log(msr, 4, "Setting default timeout collection value %d.",msr->txcfg->col_timeout);
+        }
+
         /* Add default timeout. */
         var = (msc_string *)apr_pcalloc(msr->mp, sizeof(msc_string));
         var->name = "__expire_KEY";