Re: How big to make Large IO cache pools ?

Hi Jeff

I am reading your presentation about Cache and I have some questions:

You wrote

“

DO THE FOLLOWING ALL USE LARGE I/O??

Pop Quiz Answers

1. A.

Large scans such as table scans, range scans & index leaf

scans (Yes)

1. B.

Maintenance operations such as dbcc, update statistics

(Yes)

1. C.

Create index (Yes)

1. D.

Bcp

in on heap tables (Yes)

1. E.

Select/into (Yes)

1. F.

Insert/select (No)

1. G.

Asynchronous Prefetch”

Interesting to me situations C&D.

Could you please explane me how I can use (for example 64kb poll) if my normall page size 8k.

I have some cache:

Cache Name      Status   Type      Config Value      Run Value

default data cache          Active   Default 12288.00 Mb     12288.00 Mb

log_cache           Active   Log Only                 800.00 Mb          800.00 Mb

tempdb1_cache              Active   Mixed     3072.00 Mb        3072.00 Mb

tempdb2_cache              Active   Mixed     3072.00 Mb        3072.00 Mb

------------ ------------                                                   

                            Total    19232.0 Mb 19232.0 Mb                                                                    

==========================================================================                                                           

Cache: default data cache,   Status: Active,   Type: Default                                                            

      Config Size: 12288.00 Mb,   Run Size: 12288.00 Mb                                                      

      Config Replacement: strict LRU,   Run Replacement: strict LRU

      Config Partition:            4, Run Partition:            4

IO Size  Wash Size           Config Size         Run Size              APF Percent

    8 Kb       245760 Kb         9788.00 Mb        9788.00 Mb          10

   64 Kb       40960 Kb          2500.00 Mb        2500.00 Mb          10

==========================================================================                                                           

Cache: log_cache,   Status: Active,   Type: Log Only                                                           

      Config Size: 800.00 Mb,   Run Size: 800.00 Mb                                                                

      Config Replacement: strict LRU,   Run Replacement: strict LRU

      Config Partition:            2, Run Partition:            2

IO Size  Wash Size           Config Size         Run Size              APF Percent

    8 Kb        20480 Kb           100.00 Mb          100.00 Mb           10

   16 Kb      122880 Kb          700.00 Mb          700.00 Mb           10

==========================================================================                                                           

Cache: tempdb1_cache,   Status: Active,   Type: Mixed                                                                  

      Config Size: 3072.00 Mb,   Run Size: 3072.00 Mb                                                           

      Config Replacement: strict LRU,   Run Replacement: strict LRU

      Config Partition:            4, Run Partition:            4

IO Size  Wash Size           Config Size         Run Size              APF Percent

    8 Kb        36864 Kb          2712.00 Mb        2712.00 Mb          10

   16 Kb       24576 Kb           360.00 Mb          360.00 Mb           10

But when I create index I have next situation

    STEP 1

        The type of query is CREATE INDEX.

        TO TABLE

        dbo.tTest

        Using I/O Size 8 Kbytes for data pages.

What command or syntaxes use for  instructions what in operation bcp & create index use    64 Kb pool?