diff --git a/src/common/backend/utils/misc/guc.cpp b/src/common/backend/utils/misc/guc.cpp
index 93782b46b71dd5de6544868fac130d08105eb0f4..aa79befda62438cc8b6bbcaf9174f3558e870cf1 100755
--- a/src/common/backend/utils/misc/guc.cpp
+++ b/src/common/backend/utils/misc/guc.cpp
@@ -6709,6 +6709,8 @@ void BeginReportingGUCOptions(void)
 
     u_sess->utils_cxt.reporting_enabled = true;
 
+    /* start transaction to allow calling SearchSysCache such as show_collation_connection */
+    start_xact_command();
     /* Transmit initial values of interesting variables */
     for (i = 0; i < u_sess->num_guc_variables; i++) {
         struct config_generic* conf = u_sess->guc_variables[i];
@@ -6716,7 +6718,7 @@ void BeginReportingGUCOptions(void)
         if (conf->flags & GUC_REPORT)
             ReportGUCOption(conf);
     }
-    
+    finish_xact_command();
 }
 
 /*