Add optimization documentation about missing indexes in 1.10.0

documentation/optimization.html

@@ -337,6 +337,19 @@ To solve this performance issue, you can execute the following query manually in
 <pre>
 ALTER TABLE user_rel_tag ADD INDEX idx_user_rel_tag_user (user_id);
 </pre>
+<br /><br />
+In Chamilo 1.10.0 (the first version of the serie), many indexes were forgotten, so you can boost your database by adding the following indexes:<br />
+<pre>
+alter table extra_field_values add index idx_extra_field_values (field_id, item_id);
+alter table usergroup_rel_user add index idx_usergroup_ru (group_id);
+alter table usergroup_rel_user add index idx_usergroup_ru_u (user_id);
+alter table c_student_publication add index idxstudpub_cid (c_id);
+alter table c_student_publication add index idxstudpub_uid (user_id);
+alter table c_quiz_question add index idx_cqq_cid (c_id);
+alter table c_quiz_rel_question ADD INDEX idx_cqrq_qid (question_id);
+alter table c_quiz_rel_question ADD INDEX idx_cqrq_cid (c_id);
+alter table c_quiz_answer add index idx_qa_cidqid (c_id, question_id);
+</pre>
 <hr />
 <h2><a name="3.Indexes-caching"></a>3. Indexes caching</h2>
 One good reference: <a href="http://dev.mysql.com/doc/refman/5.1/en/multiple-key-caches.html">MySQL documentation on multiple key caches</a><br />