[ci skip] feature/session (#3073): Extend a note about DB drivers and locking

1 files changed, 6 insertions, 4 deletions

diff --git a/user_guide_src/source/libraries/sessions.rst b/user_guide_src/source/libraries/sessions.rst
index 36b5415ac..3ca5aad17 100644
--- a/user_guide_src/source/libraries/sessions.rst
+++ b/user_guide_src/source/libraries/sessions.rst
@@ -581,10 +581,12 @@ also do the following, after creating the table::
 	ALTER TABLE ci_sessions ADD CONSTRAINT ci_sessions_id_ip UNIQUE (session_id, ip_address);
 
 .. important:: Only MySQL and PostgreSQL databases are officially
-	supported, due to lack of locking mechanisms on other platforms.
-	Using sessions without locks can cause all sorts of problems,
-	especially with heavy usage of AJAX, and we will not support
-	such cases.
+	supported, due to lack of advisory locking mechanisms on other
+	platforms. Using sessions without locks can cause all sorts of
+	problems, especially with heavy usage of AJAX, and we will not
+	support such cases. Use ``session_write_close()`` after you've
+	done processing session data if you're having performance
+	issues.
 
 Redis Driver
 ------------