diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
new file mode 100644
index 623e6bf..a5d66d8
*** a/src/backend/commands/tablecmds.c
--- b/src/backend/commands/tablecmds.c
***************
*** 13,18 ****
--- 13,19 ----
   *-------------------------------------------------------------------------
   */
  #include "postgres.h"
+ #include <unistd.h>
  
  #include "access/genam.h"
  #include "access/heapam.h"
*************** ExecuteTruncate(TruncateStmt *stmt)
*** 1265,1270 ****
--- 1266,1272 ----
  
  		heap_close(rel, NoLock);
  	}
+ 	sleep(5);
  }
  
  /*
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
new file mode 100644
index 26275bd..9147a79
*** a/src/backend/utils/misc/guc.c
--- b/src/backend/utils/misc/guc.c
*************** extern const struct config_enum_entry dy
*** 408,414 ****
  /*
   * GUC option variables that are exported from this module
   */
! bool		log_duration = false;
  bool		Debug_print_plan = false;
  bool		Debug_print_parse = false;
  bool		Debug_print_rewritten = false;
--- 408,414 ----
  /*
   * GUC option variables that are exported from this module
   */
! bool		log_duration = true;
  bool		Debug_print_plan = false;
  bool		Debug_print_parse = false;
  bool		Debug_print_rewritten = false;
*************** static struct config_bool ConfigureNames
*** 1082,1088 ****
  			NULL
  		},
  		&log_duration,
! 		false,
  		NULL, NULL, NULL
  	},
  	{
--- 1082,1088 ----
  			NULL
  		},
  		&log_duration,
! 		true,
  		NULL, NULL, NULL
  	},
  	{
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
new file mode 100644
index 110983f..82eca10
*** a/src/backend/utils/misc/postgresql.conf.sample
--- b/src/backend/utils/misc/postgresql.conf.sample
***************
*** 414,420 ****
  #log_checkpoints = off
  #log_connections = off
  #log_disconnections = off
! #log_duration = off
  #log_error_verbosity = default		# terse, default, or verbose messages
  #log_hostname = off
  #log_line_prefix = ''			# special values:
--- 414,420 ----
  #log_checkpoints = off
  #log_connections = off
  #log_disconnections = off
! #log_duration = on
  #log_error_verbosity = default		# terse, default, or verbose messages
  #log_hostname = off
  #log_line_prefix = ''			# special values: