diff --git a/config/alfresco/bootstrap-context.xml b/config/alfresco/bootstrap-context.xml
index 44a37c5dfa..4958d736c0 100644
--- a/config/alfresco/bootstrap-context.xml
+++ b/config/alfresco/bootstrap-context.xml
@@ -128,6 +128,7 @@
              <ref bean="patch.db-V3.3-JBPM-Extra" />
              <ref bean="patch.db-V3.3-Node-Prop-Serializable" />
              <ref bean="patch.db-V3.4-property-unique-ctx-value" />
+             <ref bean="patch.db-V3.4-child-assoc-indexes" />
           </list>
        </property>
     </bean>
diff --git a/config/alfresco/dbscripts/create/org.hibernate.dialect.PostgreSQLDialect/AlfrescoCreate-RepoTables.sql b/config/alfresco/dbscripts/create/org.hibernate.dialect.PostgreSQLDialect/AlfrescoCreate-RepoTables.sql
index 1644322aee..99e22c6e11 100644
--- a/config/alfresco/dbscripts/create/org.hibernate.dialect.PostgreSQLDialect/AlfrescoCreate-RepoTables.sql
+++ b/config/alfresco/dbscripts/create/org.hibernate.dialect.PostgreSQLDialect/AlfrescoCreate-RepoTables.sql
@@ -346,6 +346,7 @@ CREATE INDEX fk_alf_cass_cnode ON alf_child_assoc (child_node_id);
 CREATE INDEX fk_alf_cass_tqn ON alf_child_assoc (type_qname_id);
 CREATE INDEX fk_alf_cass_qnns ON alf_child_assoc (qname_ns_id);
 CREATE INDEX idx_alf_cass_qncrc ON alf_child_assoc (qname_crc, type_qname_id, parent_node_id);
+CREATE INDEX idx_alf_cass_pri ON alf_child_assoc (parent_node_id, is_primary, child_node_id);
 CREATE SEQUENCE alf_child_assoc_seq START WITH 1 INCREMENT BY 1;
 
 CREATE TABLE alf_locale
diff --git a/config/alfresco/dbscripts/upgrade/3.4/org.hibernate.dialect.Dialect/child-assoc-indexes.sql b/config/alfresco/dbscripts/upgrade/3.4/org.hibernate.dialect.Dialect/child-assoc-indexes.sql
new file mode 100644
index 0000000000..a6c4b9deca
--- /dev/null
+++ b/config/alfresco/dbscripts/upgrade/3.4/org.hibernate.dialect.Dialect/child-assoc-indexes.sql
@@ -0,0 +1,22 @@
+--
+-- Title:      Upgrade to V3.4 - Add alf_child_assoc.idx_alf_cass_pri index
+-- Database:   Generic
+-- Since:      V3.4 schema 4105
+-- Author:     unknown
+--
+-- Please contact support@alfresco.com if you need assistance with the upgrade.
+--
+
+CREATE INDEX idx_alf_cass_pri ON alf_child_assoc (parent_node_id, is_primary, child_node_id); --(optional)
+
+--
+-- Record script finish
+--
+DELETE FROM alf_applied_patch WHERE id = 'patch.db-V3.4-child-assoc-indexes';
+INSERT INTO alf_applied_patch
+  (id, description, fixes_from_schema, fixes_to_schema, applied_to_schema, target_schema, applied_on_date, applied_to_server, was_executed, succeeded, report)
+  VALUES
+  (
+    'patch.db-V3.4-child-assoc-indexes', 'Manually executed script upgrade V3.4',
+     0, 4104, -1, 4105, null, 'UNKOWN', ${TRUE}, ${TRUE}, 'Script completed'
+   );
diff --git a/config/alfresco/patch/patch-services-context.xml b/config/alfresco/patch/patch-services-context.xml
index b84b3bde52..c611b03259 100644
--- a/config/alfresco/patch/patch-services-context.xml
+++ b/config/alfresco/patch/patch-services-context.xml
@@ -2164,6 +2164,17 @@
         </property>
     </bean>
 
+    <bean id="patch.db-V3.4-child-assoc-indexes" class="org.alfresco.repo.admin.patch.impl.SchemaUpgradeScriptPatch" parent="basePatch">
+        <property name="id"><value>patch.db-V3.4-child-assoc-indexes</value></property>
+        <property name="description"><value>patch.schemaUpgradeScript.description</value></property>
+        <property name="fixesFromSchema"><value>0</value></property>
+        <property name="fixesToSchema"><value>4104</value></property>
+        <property name="targetSchema"><value>4105</value></property>
+        <property name="scriptUrl">
+            <value>classpath:alfresco/dbscripts/upgrade/3.4/${db.script.dialect}/child-assoc-indexes.sql</value>
+        </property>
+    </bean>
+
     <bean id="patch.db-V3.3-JBPM-Extra" class="org.alfresco.repo.admin.patch.impl.SchemaUpgradeScriptPatch" parent="basePatch">
         <property name="id"><value>patch.db-V3.3-JBPM-Extra</value></property>
         <property name="description"><value>patch.schemaUpgradeScript.description</value></property>