Increase max_parallel_degree from 0 to 2.

diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
index 5fc80e735beb0aa7856ac7706778e71312b70a09..21505249b09b02effd99dbf15bfae3611229a599 100644 (file)
--- a/src/backend/optimizer/path/costsize.c
+++ b/src/backend/optimizer/path/costsize.c
@@ -112,7 +112,7 @@ int                 effective_cache_size = DEFAULT_EFFECTIVE_CACHE_SIZE;
 
 Cost           disable_cost = 1.0e10;
 
-int                    max_parallel_degree = 0;
+int                    max_parallel_degree = 2;
 
 bool           enable_seqscan = true;
 bool           enable_indexscan = true;

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 38ba82fe4b66fab912f1cf2a6226fb1726d54911..d949c19ca2f32414c756a1d8eab65a621e709e0d 100644 (file)
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -2550,7 +2550,7 @@ static struct config_int ConfigureNamesInt[] =
                        NULL
                },
                &max_parallel_degree,
-               0, 0, MAX_BACKENDS,
+               2, 0, MAX_BACKENDS,
                NULL, NULL, NULL
        },
 

diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 029114fc22d9fee77a6bd76626e3e264e210592b..930628c33bccd857a11337185c83f77ffec05407 100644 (file)
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -164,7 +164,7 @@
 
 #effective_io_concurrency = 1          # 1-1000; 0 disables prefetching
 #max_worker_processes = 8
-#max_parallel_degree = 0               # max number of worker processes per node
+#max_parallel_degree = 2               # max number of worker processes per node
 
 
 #------------------------------------------------------------------------------