为什么统计数据没有重新计算？

Question

I have SQL Server Compact Edition 4.0 database that get ~1K records every day. But over time some queries lost their efficency. I re-checked indexes and statistics and found that the statistics were not updated long time. sp_show_statistics shows me the following:

TABLE       INDEX               UPDATED             ROWS    ROWS__SAMPLED   STEPS   DENSITY         AV_KEY_LEN  RECOMPUTE   STALE
Events      PK_Events           18.08.2015 7:45:08  1876754 1876754         5       5,328349E-07    4           True        False
Files       PK_Files            09.08.2015 18:15:00 411589  411589          3       2,429608E-06    4           True        False
Revisions   PK_Revisions        07.07.2015 8:10:05  376296  376296          5       2,657482E-06    4           True        False
Revisions   UQ_Revisions_Guid   07.07.2015 8:10:50  376296  376296          200     2,657482E-06    16          True        False
...

From MSDN (sp_show_statistics):

RECOMPUTE. A Boolean value. True indicates that this statistic will be automatically updated the next time it is used, if it is determined to be stale.

All indexes were created without STATISTICS_NORECOMPUTE option. Database is used intensively every day. One more detail: Revisions table now has 442067 records, but statistics for this table were build on 376296 rows as I see in sp_show_statistics output.

How I can keep the statistics up-to-date? Thanks!

Answer 1

You can use "UPDATE STATISTICS"

https://technet.microsoft.com/en-us/library/ms174025(v=sql.110).aspx