diff --git a/src/core/databasefactory.cpp b/src/core/databasefactory.cpp
index c8ac51d81..f755550c0 100644
--- a/src/core/databasefactory.cpp
+++ b/src/core/databasefactory.cpp
@@ -80,6 +80,9 @@ QSqlDatabase DatabaseFactory::initialize(const QString &connection_name) {
     query_db.exec("PRAGMA encoding = \"UTF-8\"");
     query_db.exec("PRAGMA synchronous = OFF");
     query_db.exec("PRAGMA journal_mode = MEMORY");
+    // TODO: prozkoumat cache a page size a lockingmode co to je
+    query_db.exec("PRAGMA page_size = 4096");
+    query_db.exec("PRAGMA cache_size = 16384");
     query_db.exec("PRAGMA count_changes = OFF");
     query_db.exec("PRAGMA temp_store = MEMORY");
 
@@ -158,7 +161,7 @@ QSqlDatabase DatabaseFactory::connection(const QString &connection_name) {
     }
 
     if (!database.isOpen() && !database.open()) {
-      qFatal("Database was NOT opened. Delivered error message: '%s'",
+      qFatal("Database was NOT opened. Delivered error message: '%s'.",
              qPrintable(database.lastError().text()));
     }
     else {
diff --git a/src/core/feedsmodel.cpp b/src/core/feedsmodel.cpp
index 298b9f3f6..5431e93cc 100644
--- a/src/core/feedsmodel.cpp
+++ b/src/core/feedsmodel.cpp
@@ -344,7 +344,8 @@ void FeedsModel::loadFromDatabase() {
 
   if (!query_categories.exec("SELECT * FROM Categories;") ||
       query_categories.lastError().isValid()) {
-    qFatal("Query for obtaining categories failed.");
+    qFatal("Query for obtaining categories failed. Error message: '%s'.",
+           qPrintable(query_categories.lastError().text()));
   }
 
   while (query_categories.next()) {