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--- v5:userguide:memcached [2017/04/18 10:36] – Reorder sections dregad
+++ v5:userguide:memcached [2021/01/25 02:30] – mnewnham
@@ Line 5: / Line 5: @@
 ===== The Memcache Library =====
-There are 2 PEAR modules for connecting to a [[wp>Memcached]] server: the [[https://pecl.php.net/package/memcache|Memcache]] library and the [[https://pecl.php.net/package/memcached|Memcached]] library.
+There are 2 distinct PEAR modules for connecting to a [[wp>Memcached]] server: the [[https://pecl.php.net/package/memcache|Memcache]] library and the [[https://pecl.php.net/package/memcached|Memcached]] library.
 <WRAP tip>
   * Windows support is only available for the //Memcache// library.
@@ Line 12: / Line 12: @@
   * If both libraries are available, //Memcache// will be used.
 </WRAP>
+===== Why can't I use the memcached library under Windows? =====
+The memcached library is much more heavily featured, more modern and better maintained. The problem with it is not a problem with ADOdb, nor a problem with PHP. The PHP module is dependent on the 3rd party library **libmemcache**, which has no Windows support. Any Windows DLLs you might find floating around the web will __always__ be built on the memcache library.
@@ Line 54: / Line 55: @@
 </code>
+===== Adding Weighted Server Groups =====
+From ADOdb version 5.22, the **memcached** library supports the use of **//Weighted server groups//**, in which a specific server can be forced to return a result a specific percentage of the time. If the feature is used, the total weighting of the server group must equal 100$.  To achieve this the configuration of the servers must be defined in a different way to the default. Each host is defined as an array:
+<code php>
+array(
+ 'host'=> The host name,
+ 'port'=> The port, defaults to 11211,
+ 'weight'=> A percentag, up to 100,
+);
+</code>
+The host arrays are then combined together. In this example 86.91 serves 70% of requests and 86.92 serves 30%
+<code php>
+$hosts = array(
+    array('host'=>'192.168.86.91','port'=>'11211','weight'=>70)
+    array('host'=>'192.168.86.92','port'=>'11211','weight'=>30)
+    );
+$db = NewADOConnection($driver='mysqli');
+/*
+ * Enable memcache
+ */
+$db->memCache = true;
+/*
+ * Add the weighted servers
+ */
+$db->memCacheHost = $hosts
+</code>
 ===== Using Debug Mode  =====