diff --git a/polardb_build.sh b/polardb_build.sh
index 295ebe5a726..e22adc3ffd0 100755
--- a/polardb_build.sh
+++ b/polardb_build.sh
@@ -584,7 +584,7 @@ then
         log_directory = 'pg_log'
 
         unix_socket_directories='.'
-        shared_buffers = 128MB
+        shared_buffers = '2GB'
         synchronous_commit = on
         full_page_writes = off
         #random_page_cost = 1.1