The Global Cache Main Menu is used to select the global caching function to be executed.
14:43:15 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
- Global Cache Main Menu - PCH0002
Global Cache
Code Function
---- --------------------------
D Define RABNs to be Cached
M Global Cache Maintenance
O Maintain Cache Spaces
P Maintain Cache Parameters
S Cache Session Summary
? Help
. Exit
---- --------------------------
Code ............ _
Cache Space No .. _____
DataBase ........ 1955 (WIS1955)
Command ==>
PF1----- PF2------ PF3------ PF4------ PF6----- PF7----- PF8----- PF12-----
Help Exit Menu |
The following function codes are available:
| Code | Description |
|---|---|
| D | Define a new cache space for one or more RABNs |
| M | Perform global operations on all cache spaces defined for the database |
| O | Display and modify individual cache spaces defined for the database |
| P | Display and modify current settings of ADARUN parameters |
| S | Display summary cache session statistics |
Selecting option D from the Global Cache Main Menu displays a menu of functions for defining one or more RABNs to be cached:
14:57:55 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
- Define RABNs to be Cached - PCHD002
Global Cache
Code Function
---- -----------------
A Define Asso Cache
D Define Data Cache
? Help
. Exit
---- -----------------
Code .............. _
Memory Type ....... _
RABN Number From .. __________
RABN Number To .... __________
Cache Space No .... _____
Database .......... 1955 (WIS1955)
Command ==>
PF1----- PF2------ PF3------ PF4------ PF6----- PF7----- PF8----- PF12-----
Help Exit Menu |
| Field | Description |
|---|---|
| Code |
RABNs may be cached in Associator (option A) and/or Data Storage (option D) space. A separate operation is required for each type of caching. |
| Memory Type |
The memory type can be extended memory (E), data space (D), hiperspace (H), or virtual 64 (V). The choices available depend on the operating system configuration under which Adabas is running. Virtual 64 is only available for systems running z/OS version 1.2 or above on the appropriate hardware. |
| RABN Number From...To |
Specifying the start RABN (RABN Number From...) and the end RABN (RABN Number To...) defines a RABN range to be cached in the defined cache space. If only one RABN is to be cached, it is not necessary to specify an ending RABN number. |
| Cache Space No |
A cache space number (CSN) is a unique number called the RABN Range ID that will be assigned to the new RABN range. Valid values are 0 through 65535. If the number specified is already in use, the new RABN range definition is ignored and an error message is displayed on both DDPRINT and the operator console. If no number is provided or zero is specified, a CSN allocated by the nucleus will be returned. Note: The settings for the cache spaces being defined correspond to those
specified by the ADARUN parameters The corresponding direct commands are
and
|
Selecting option M from the Global Cache Main Menu displays a menu of functions for maintaining cache spaces:
15:13:08 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
- Global Cache Maintenance - PCHM002
Global Cache
Code Function
---- -------------
D Delete Cache
M Modify Cache
E Enable Cache
S Disable Cache
? Help
. Exit
---- -------------
Code ............
Cache Space No .. ALL
Database ........ 1955 (WIS1955)
Command ==>
PF1----- PF2------ PF3------ PF4------ PF6----- PF7----- PF8----- PF12------
Help Exit Menu |
From this screen, global operations can be performed on all cache spaces defined for the database. The allowed functions are
| D | Delete all cache spaces. Once deleted, spaces must be redefined using Main Menu function D or by restarting the Adabas nucleus with the relevant ADARUN parameters. |
| M | Move all cache spaces to the memory type (E for extended; D for data space; H for hiperspace; V for virtual 64) you specify on the Memory Type window that appears. |
| S | Disable all cache spaces. |
| E | Start cache operation for all cache spaces. |
The corresponding direct command is
These same functions can be performed on individual cache spaces using the Maintain Cache Spaces function (menu option O).
Selecting option O from the Global Cache Main Menu displays a list of cache spaces currently allocated for the database:
15:16:05 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
DBID 1955 - Maintain Cache Spaces - PCHS002
Global Cache
Sel No Mem. Cach RABN Range Last Activity Stat Error Status
Type Type From To
-- ----- ---- ---- -------------------- ---------------- ---- ----------------
1 EXT ASSO 281 801 2001-09-13 10:43 ALLO
2 EXT DATA 1 630 2001-09-13 10:42 ALLO
Select DI(Display) EN(Enable) DS(Disable) DE(Delete) MO(Modify)
PF1----- PF2------ PF3------ PF4------ PF6----- PF7----- PF8----- PF12-----
Help Exit Refresh Menu |
Note:
If you specify the cache space number (CSN) on the Global Cache Main
Menu along with function code O, the Cache Statistics screen for that CSN is
displayed (DI) directly.
For each RABN range listed on the Maintain Cache Spaces screen, you can display and modify caching parameters by entering one of the following commands in the Select column:
| Cmd | Action |
|---|---|
MO |
Move the selected cache space to the memory type (E for extended; D for data space; H for hiperspace; V for virtual 64) you specify on the Memory Type window that appears. |
DE |
Delete the selected cache space. Once deleted, the space must be redefined using the Main Menu function D or the relevant ADARUN parameters. |
DI |
Display the detailed cache space statistics. The information
provided is the same as that resulting from the
CSTAT operator command.
|
DS |
Disable the selected cache space. |
EN |
Start caching operation for the selected cache space. |
The other columns on the Maintain Cache Spaces display contain the following information:
| Column | Description |
|---|---|
| No. | Cache space number (CSN). This is actually a unique RABN Range ID as there is no longer a direct correlation between cache spaces and RABN ranges. |
| Memory Type | Caching type for each cache space: extended storage (EXT), data spaces (DS), hiperspaces (HS), or virtual 64 storage (V64). |
| Cache Type | Database component being cached in the cache space: Associator (ASSO), Data Storage (DATA), Work part 2 (WRK2), or Work part 3 (WRK3). |
| RABN Range | The starting (From...) and ending (To...) RABNs of the RABN range being cached in the cache space. |
| Last Activity | The date and time the cache space was last accessed. |
| Status | The current status of the cache space: disabled (DISA); unallocated (UNAL); or ALLC (allocated). |
| Error Status | If an error condition has occurred, the cause of the error will be displayed in this field. |
Entering DI in the Select column on the
Maintain Cache Spaces screen or selecting option O and specifying a cache
number on the Global Cache Main Menu displays the Cache Statistics screen for
an individual cache space:
15:23:54 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
DBID 1955 - Cache Statistics - PCHS002
Global Cache
Cache Space No ...... 2
Memory Type ....... EXT
Cache Component ... DATA
RABN-range ........ 1 - 630
Last Activity ..... 2001-09-13 10:42:51
Cache Status ...... ALLOCATED
Cache Writes ...... 6322
Max. Cache used ... 236180 Elapsed Time per Cache Read Request
Cache Size ........ 1515520 Max. ... 0.013168
Cache Efficiency .. 99.0 % Min. ... 0.000002
Cache Reads ....... 6273 Avg. ... 0.000013
Read EXCPS ........ 62
Total Reads ....... 6335 EXCP Time <in microseconds>
RABN's in Cache ... 49 Max. ... 0.007237
RABN's/Cache Space. 314 Min. ... 0.003476
RABN Index Size ... 2536 (bytes) Avg. ... 0.003923
Press ENTER to continue |
The information displayed on this screen is the same as that displayed by the CSTAT operator command.
Note:
Values for Max. Cache used, Cache
Size, RABNs in Cache, and
RABNs/Cache Space represent bytes, but may be marked
with a K (1 kilobyte=1024 bytes), M (1 megabyte=1,048,576 bytes), or G (1
gigabyte=1,073,741,824 bytes) indicator when the size of the value requires
it.
Selecting option P from the Global Cache Main Menu displays the current Adabas Caching (ADARUN) parameter values and allows you to change them:
15:28:46 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
DBID 1955 - Maintain Cache Parameters - PCHS002
Display Cache Space Stats. YES_ (CDISPSTAT)
Minimum Buff. Efficiency . _________0 (CDEMAND)
Elapsed Time (GETMAIN) .. _______900 sec (CRETRY)
Time of Inactivity ....... ______7200 sec (CCTIMEOUT)
Max. No. Permitted ..... 5 (CMAXCSPS)
Max. ASSO Cache Size ..... ____303104 _ (CASSOMAXS)
Max. DATA Cache Size ..... ____303104 _ (CDATAMAXS)
WORK Memory Type ......... EXT (CWORKSTORAGE)
Percent WORK2 RABNs ...... 0 % (CWORK2FAC)
Percent WORK3 RABNS ...... 0 % (CWORK3FAC)
Read-ahead Caching
Number of Buffers ...... 0 (CBUFNO)
Command Types Excluded . ________ (CEXCLUDE)
Included . P/L/H/F PHYS/LOGI/HIST/FIND
PF1----- PF2------ PF3------ PF4------ PF6----- PF7----- PF8----- PF12-----
Help Exit Menu |
Notes:
I
CMS must be issued before each nucleus is started in a VM/ESA
environment.
For more information about these parameters, see the section Adabas Caching Parameters.
Selecting option S from the Global Cache Main Menu displays a summary of information for the Adabas Caching session including cache statistics, read-ahead statistics, and allocation statistics for active and inactive cache spaces. This information is the same as that displayed when the CSUM command is issued.
15:31:08 ***** A D A B A S CACHING FACILITY ***** 2004-05-11
DBID 1955 Cache Session Summary PCHS002
Global Cache
Cache Allocation Summary Page 1
Current Adabas Buffer Efficiency ....... 278.7
Projected NON-CACHE Buffer Efficiency .. 11.3
Number of Active Cache Spaces .......... 2
Number of Cache Spaces defined ......... 2
--- ASSO --- --- DATA --- --- WORK ---
Cache Statistics
Cache writes ....... 127 6322 0
Read EXCPS ......... 17 62 0
Cache reads ........ 118 6273 0
Total reads ........ 135 6335 0
Efficiency ......... 87.4 99.0 0.0
Read Ahead Statistics
RABN's read ........ 0 0
EXCPS .............. 0 0
Ave. blks/EXCP ..... 0.0 0.0 next page |
Page 2
Cache Size Summary
--- ASSO --- --- DATA --- --- WORK ---
Max Cache Size ..... 1,480 K 1,480 K 0 K
EXT Allocated ...... 296 K 296 K 0 K
EXT Highest ........ 296 K 296 K
DSP Allocated ...... 0 K 0 K 0 K
DSP Highest ........ 0 K 0 K
HSP Allocated ...... 0 K 0 K 0 K
HSP Highest ........ 0 K 0 K
V64 Allocated ...... 0 0 0 K
V64 Highest ........ 0 0
Allocation Statistics marked as K, M, or G. |
Help screens are available by pressing PF1 from each page of the Cache Session Summary report.