X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/e7b738fe35a2ec13efdc22c9f068c477182da6c3..5f19b23f49aee9989267ac03b488049f9d681166:/docs/admin/Faq.md?ds=inline

diff --git a/docs/admin/Faq.md b/docs/admin/Faq.md
index 46da7e21..db5e101c 100644
--- a/docs/admin/Faq.md
+++ b/docs/admin/Faq.md
@@ -71,6 +71,23 @@ and recompile (`cmake .. && make`).
 Reinstall the nominatim functions with `setup.php --create--functions`
 and check for any errors, e.g. a missing `nominatim.so` file.
 
+### I see the error: "ERROR: mmap (remap) failed"
+
+This may be a simple out-of-memory error. Try reducing the memory used
+for `--osm2pgsql-cache`. Also make sure that overcommitting memory is
+allowed: `cat /proc/sys/vm/overcommit_memory` should print 0 or 1.
+
+If you are using a flatnode file, then it may also be that the underlying
+filesystem does not fully support 'mmap'. A notable candidate is virtualbox's
+vboxfs.
+
+### nominatim UPDATE failed: ERROR: buffer 179261 is not owned by resource owner Portal
+
+Several users [reported this](https://github.com/openstreetmap/Nominatim/issues/1168) during the initial import of the database. It's 
+something Postgresql internal Nominatim doesn't control. And Postgresql forums
+suggest it's threading related but definitely some kind of crash of a process.
+Users reported either rebooting the server, different hardware or just trying
+the import again worked. 
 
 ### The website shows: "Could not get word tokens"
 
@@ -93,6 +110,11 @@ However, you can solve this the quick and dirty way by commenting out that line
     sudo systemctl restart httpd
 
 
+### "must be an array or an object that implements Countable" warning in /usr/share/pear/DB.php
+
+The warning started with PHP 7.2. Make sure you have at least [version 1.9.3 of PEAR DB](https://github.com/pear/DB/releases)
+installed.
+
 ### Website reports "DB Error: insufficient permissions"
 
 The user the webserver, e.g. Apache, runs under needs to have access to the Nominatim database. You can find the user like [this](https://serverfault.com/questions/125865/finding-out-what-user-apache-is-running-as), for default Ubuntu operating system for example it's `www-data`.