phpcs: Normalize methods declarations to "[final abstract] [visibility]".

[lhc/web/wiklou.git] / docs / database.txt

diff --git a/docs/database.txt b/docs/database.txt
index b9fa6ff..c0a2412 100644 (file)
--- a/docs/database.txt
+++ b/docs/database.txt
@@ -8,7 +8,7 @@ By Tim Starling, January 2006.
 For information about the MediaWiki database layout, such as a 
 description of the tables and their contents, please see:
   http://www.mediawiki.org/wiki/Manual:Database_layout
-  http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/maintenance/tables.sql?view=markup
+  https://gerrit.wikimedia.org/r/gitweb?p=mediawiki/core.git;a=blob_plain;f=maintenance/tables.sql;hb=HEAD
 
 
 ------------------------------------------------------------------------
@@ -153,9 +153,9 @@ enclose small groups of queries in their own transaction. Use the
 following syntax:
 
 $dbw = wfGetDB( DB_MASTER );
-$dbw->begin();
+$dbw->begin( __METHOD__ );
 /* Do queries */
-$dbw->commit();
+$dbw->commit( __METHOD__ );
 
 Use of locking reads (e.g. the FOR UPDATE clause) is not advised. They
 are poorly implemented in InnoDB and will cause regular deadlock errors.
@@ -186,3 +186,14 @@ MediaWiki does support the following other DBMSs to varying degrees.
 More information can be found about each of these databases (known issues,
 level of support, extra configuration) in the "databases" subdirectory in
 this folder.
+
+------------------------------------------------------------------------
+    Use of GROUP BY
+------------------------------------------------------------------------
+
+MySQL supports GROUP BY without checking anything in the SELECT clause. 
+Other DBMSs (especially Postgres) are stricter and require that all the 
+non-aggregate items in the SELECT clause appear in the GROUP BY. For 
+this reason, it is highly discouraged to use SELECT * with GROUP BY 
+queries.
+