After few months I tried to do something with my old huge database. I enabled debugging mode and as you sad I found fatal error. ;)
On moodle 2.9 (with about 400 views full of content) I see this message:
"Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 32 bytes) in /.../m29/mod/dataform/classes/pluginbase/dataformfieldrenderer.php on line 68"
Only one time I saw complete list of views! But then was warning (below). Alter refresh page I got above message about fatal error.
Warning was this:
"Warning: Declaration of mod_dataform\plugininfo\dataformview::load_settings(mod_dataform\plugininfo\part_of_admin_tree $adminroot, $parentnodename, $hassiteconfig) should be compatible with core\plugininfo\base::load_settings(part_of_admin_tree $adminroot, $parentnodename, $hassiteconfig) in /...l/m29/mod/dataform/classes/plugininfo/dataformview.php on line 30"
On moodle 3.0 (with 512 blank views) I see something like this:
"Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 110 bytes) in /.../moodle/mod/dataform/classes/pluginbase/dataformviewpatterns.php on line 65"
I tested with PHP 5.4.4, 5.5.35 and 5.6.25 and memory_limit=256MB (and I can't increase this parameter in administrator panel on host page)
Do you have any idea how can I solve this problem?