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SET @global_start_value = @@global.ndb_optimized_node_selection; SELECT @global_start_value; @global_start_value 3 set session ndb_optimized_node_selection=3; show variables like 'ndb_optimized_node_selection'; Variable_name Value ndb_optimized_node_selection 3 set session ndb_optimized_node_selection=0; show variables like 'ndb_optimized_node_selection'; Variable_name Value ndb_optimized_node_selection 0 set session ndb_optimized_node_selection=4; Warnings: Warning 1292 Truncated incorrect ndb_optimized_node_selection value: '4' show variables like 'ndb_optimized_node_selection'; Variable_name Value ndb_optimized_node_selection 3 set global ndb_optimized_node_selection=1; show variables like 'ndb_optimized_node_selection'; Variable_name Value ndb_optimized_node_selection 3 show variables like 'ndb_optimized_node_selection'; Variable_name Value ndb_optimized_node_selection 1 set global ndb_optimized_node_selection=3; SELECT @@global.ndb_optimized_node_selection; @@global.ndb_optimized_node_selection 3