DB2 8 FP 15 LUW

Делаю get snaphot for applications. Для некоторых приложений получаю такую статистику:

Connection request start timestamp = 01/28/2009 16:54:21.323500
Connect request completion timestamp = 01/28/2009 16:54:21.323883
Snapshot timestamp = 01/28/2009 17:34:06.204569
Buffer pool data writes = 0
Buffer pool index writes = 0
Total buffer pool write time (milliseconds)= 0
Direct writes = 0
Direct write requests = 0
Direct write elapsed time (ms) = 0
Rows deleted = 0
Rows inserted = 19814
Rows updated = 9908
Rows written = 61242

Видим, что довольно много записей добавлено и обновлено, но при этом количество записей в buffer pool, "direct writes" равно 0. Также равно нулю затраченное время. Как это можно объснить?

Незадолго до снятия снимка включил все ON:
db2 get monitor switches

Monitor Recording Switches

Switch list for db partition number 0
Buffer Pool Activity Information (BUFFERPOOL) = ON 01/07/2009 23:59:24.915319
Lock Information (LOCK) = ON 01/08/2009 11:46:19.058265
Sorting Information (SORT) = ON 01/28/2009 16:37:00.502706
SQL Statement Information (STATEMENT) = ON 01/14/2009 12:40:34.319151
Table Activity Information (TABLE) = ON 01/28/2009 16:37:07.907655
Take Timestamp Information (TIMESTAMP) = ON 01/07/2009 23:59:24.915319
Unit of Work Information (UOW) = ON 01/07/2009 23:59:24.915319