From fd5f151a7232d2b35dd823ec1763420eea97a831 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Fri, 13 Jan 2017 07:46:47 +0000
Subject: [PATCH] New function to detect heavily used indexes

---
 include/dba.php         | 38 ++++++++++++++++++++++++++++++++++++++
 include/dbstructure.php |  7 ++++---
 include/photos.php      |  5 +++--
 mod/photos.php          |  2 +-
 4 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/include/dba.php b/include/dba.php
index 920027cbcf..17acf94328 100644
--- a/include/dba.php
+++ b/include/dba.php
@@ -138,6 +138,38 @@ class dba {
 		return $return;
 	}
 
+	public function log_index($query) {
+		$a = get_app();
+
+		if (($a->config["system"]["db_log_index"] == "") OR ($a->config["system"]["db_log_index_watch"] == "") OR
+			(intval($a->config["system"]["db_loglimit_index"]) == 0)) {
+			return;
+		}
+
+		if (strtolower(substr($query, 0, 7)) == "explain") {
+			return;
+		}
+
+		$r = $this->q("EXPLAIN ".$query);
+		if (!dbm::is_result($r)) {
+			return;
+		}
+
+		$watchlist = explode(',', $a->config["system"]["db_log_index_watch"]);
+
+		foreach ($r AS $row) {
+			if (in_array($row['key'], $watchlist) AND
+				($row['rows'] >= intval($a->config["system"]["db_loglimit_index"]))) {
+				$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+				@file_put_contents($a->config["system"]["db_log_index"], datetime_convert()."\t".
+						$row['key']."\t".$row['rows']."\t".
+						basename($backtrace[1]["file"])."\t".
+						$backtrace[1]["line"]."\t".$backtrace[2]["function"]."\t".
+						substr($query, 0, 2000)."\n", FILE_APPEND);
+			}
+		}
+	}
+
 	public function q($sql, $onlyquery = false) {
 		$a = get_app();
 
@@ -375,6 +407,9 @@ function q($sql) {
 		//logger("dba: q: $stmt", LOGGER_ALL);
 		if ($stmt === false)
 			logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
+
+		$db->log_index($stmt);
+
 		return $db->q($stmt);
 	}
 
@@ -408,6 +443,9 @@ function qu($sql) {
 		$stmt = @vsprintf($sql,$args); // Disabled warnings
 		if ($stmt === false)
 			logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true), LOGGER_DEBUG);
+
+		$db->log_index($stmt);
+
 		$db->q("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;");
 		$retval = $db->q($stmt);
 		$db->q("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;");
diff --git a/include/dbstructure.php b/include/dbstructure.php
index 5c89f49fb9..535d7c5416 100644
--- a/include/dbstructure.php
+++ b/include/dbstructure.php
@@ -587,10 +587,10 @@ function db_definition($charset) {
 			"indexes" => array(
 					"PRIMARY" => array("id"),
 					"uid_name" => array("uid", "name"),
-					"uid_self" => array("uid", "self"),
+					"self_uid" => array("self", "uid"),
 					"alias_uid" => array("alias(32)", "uid"),
-					"uid_pending" => array("uid", "pending"),
-					"uid_blocked" => array("uid", "blocked"),
+					"pending_uid" => array("pending", "uid"),
+					"blocked_uid" => array("blocked", "uid"),
 					"uid_rel_network_poll" => array("uid", "rel", "network", "poll(64)", "archive"),
 					"uid_network_batch" => array("uid", "network", "batch(64)"),
 					"addr_uid" => array("addr(32)", "uid"),
@@ -1162,6 +1162,7 @@ function db_definition($charset) {
 					"uid_contactid" => array("uid", "contact-id"),
 					"uid_profile" => array("uid", "profile"),
 					"uid_album_created" => array("uid", "album(32)", "created"),
+					"uid_album_scale_created" => array("uid", "album(32)", "scale", "created"),
 					"uid_album_resource-id_created" => array("uid", "album(32)", "resource-id(64)", "created"),
 					"resource-id" => array("resource-id(64)"),
 					)
diff --git a/include/photos.php b/include/photos.php
index 7cdd14bf6d..f3043e44ac 100644
--- a/include/photos.php
+++ b/include/photos.php
@@ -49,7 +49,7 @@ function photo_albums($uid, $update = false) {
 			/// @todo This query needs to be renewed. It is really slow
 			// At this time we just store the data in the cache
 			$albums = qu("SELECT COUNT(DISTINCT `resource-id`) AS `total`, `album`
-				FROM `photo` USE INDEX (`uid_album_created`)
+				FROM `photo`
 				WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra
 				GROUP BY `album` ORDER BY `created` DESC",
 				intval($uid),
@@ -57,9 +57,10 @@ function photo_albums($uid, $update = false) {
 				dbesc(t('Contact Photos'))
 			);
 		} else {
+// USE INDEX (`uid_album`)
 			// This query doesn't do the count and is much faster
 			$albums = qu("SELECT DISTINCT(`album`), '' AS `total`
-				FROM `photo` USE INDEX (`uid_album_created`)
+				FROM `photo`
 				WHERE `uid` = %d  AND `album` != '%s' AND `album` != '%s' $sql_extra
 				GROUP BY `album` ORDER BY `created` DESC",
 				intval($uid),
diff --git a/mod/photos.php b/mod/photos.php
index 60e5dee643..e23e4fcc92 100644
--- a/mod/photos.php
+++ b/mod/photos.php
@@ -1344,7 +1344,7 @@ function photos_content(App $a) {
 		else
 			$order = 'DESC';
 
-
+		/// @todo This query is totally bad, the whole functionality has to be changed
 		$prvnxt = qu("SELECT `resource-id` FROM `photo` WHERE `album` = '%s' AND `uid` = %d AND `scale` = 0
 			$sql_extra ORDER BY `created` $order ",
 			dbesc($ph[0]['album']),