Use the DB2 SRM BPD attributes to create situations to monitor activity details associated with specific buffer pools.
BP Hit Percent Random The random buffer pool hit percentage calculated as follows: ( (# of Random Getpages - # Random Sync Read I/O) / # of Random Getpages) * 100. Valid entry ranges from 0.0 to 100.0.
BP Hit Percent Sequential The sequential buffer pool hit percentage calculated as follows: ( (# of Sequential Getpages - #Getpage Fails - # pages read from DASD) / # of Sequential Getpages - #Getpage Fails) * 100. The # pages read from DASD is the sum of Sequential Sync Read I/O, Seq Prefetch Pages, List Prefetch Pages, and Dynamic Prefetch Pages. Valid entry ranges from 0.0 to 100.0.
Castout Attribute The castout attribute of the hiperspaces used to back the hiperpool:
Yes |
MVS is allowed to discard data cached in the hiperpool when a shortage of expanded storage arises. |
No |
MVS is prevented from discarding data cached in the hiperpool unless expanded storage pages are reconfigured out of the system. |
Valid entry is an alphanumeric text string, with a maximum length of four characters.
Deferred Write Thresh The deferred write threshold for the virtual buffer pool - DWQT. Write operations are scheduled when the percentage of unavailable pages in the virtual buffer pool exceeds this threshold in order to decrease the unavailable pages to 10% below the threshold. Valid entry is an integer of up to four digits.
Dyn Prefetch Per IO The ratio of dynamic prefetch requests to dynamic prefetch I/Os. Valid entry is an integer of up to four digits.
Getpages Per Syn IO The ratio of getpage requests to read I/Os. Valid entry is an integer of up to four digits.
HP Buffers Allocated The number of pages allocated to the hiperpool. Valid entry is an integer of up to four digits.
HP Buffers Backed The number of hiperpool pages that were backed by expanded storage at the end of the interval. Valid entry is an integer of up to four digits.
HP Buffers Delete The number of pages to be deleted in an active hiperpool as a result of pool contraction. Valid entry is an integer of up to four digits.
HP Hit Percent The hiperpool hit percentage calculated as follows: (#Hiperpool reads / (#Hiperpool Reads + #Hiperpool Read Failures)) * 100. The #Hiperpool Reads includes both synchronous and asynchronous reads. Valid entry ranges from 0.0 to 100.0.
HP Read to Write Percent The hiperpool read-to-write percentage calculated as follows: (#Hiperpool reads / (#Hiperpool Reads + #Hiperpool Writes)) * 100. The # of Hiperpool Reads combines both sync and async pages read. Valid entry ranges from 0.0 to 100.0.
HP Sequential Thresh Sequential steal threshold for the hiperpool - HPSEQT. The percentage of the hiperpool that might be occupied by sequentially accessed pages. Valid entry is an integer of up to four digits.
Hiperpool Size The number of buffers to be allocated for the hiperpool. Valid entry is an integer of up to four digits.
Interval Time The number of seconds since last sample. Valid entry is an integer of up to four digits.
List Prefetch Per IO The ratio of list prefetch requests to list prefetch I/Os. Valid entry is an integer of up to four digits.
Max Concur Prefetch The highest number of concurrent prefetch I/O streams allocated to support I/O parallelism. Valid entry is an integer of up to four digits.
Originnode the node name of the DB2 system. Valid entry is an alphanumeric text string, with a maximum length of 32 characters.
Page Reads Per Dyn Prefetch The ratio of pages read by dynamic prefetch to dynamic prefetch requests. Valid entry is an integer of up to four digits.
Page Reads Per List Prefetch The ratio of pages read by list prefetch to list prefetch requests. Valid entry is an integer of up to four digits.
Page Reads Per Prefetch The ratio of pages read by prefetch processing to total prefetch requests. Valid entry is an integer of up to four digits.
Page Reads Perseq Prefetch The ratio of pages read by sequential prefetch to sequential prefetch requests. Valid entry is an integer of up to four digits.
Page Writes Per Write IO The ratio of page writes to physical I/Os. Valid entry is an integer of up to four digits.
Pages In Use The number of virtual buffer pool pages in use at the end of the interval (a snapshot value of the current number of non-stealable buffers). A non-stealable buffer is either one which has an outstanding getpage (someone is currently looking at this page) or one which has been updated and not yet written out to DASD. Valid entry is an integer of up to four digits.
Pool ID Buffer Pool identifier. Valid entry is an integer of up to four digits.
Prefetch Per IO The ratio of prefetch requests to physical I/Os. Valid entry is an integer of up to four digits.
Seq Prefetch Per IO The ratio of pages read by sequential prefetch to sequential prefetch I/O. Valid entry is an integer of up to four digits.
Sysplex Parallel Thresh Parallel I/O sequential threshold - VPPSEQT. This threshold determines how much of the virtual buffer pool might be used for parallel I/O operations. It is a percentage of the VPSEQT. If set to zero, I/O parallelism is disabled. Valid entry is an integer of up to four digits.
Time The date and time, as set on the monitored system, indicating the instance when the agent collects information. The timestamp format for SCAN and STR functions is CYYMMDDHHMMSSmmm (as in 1020315064501000 for 03/15/02 06:45:01) where:
C = Century (0 for 20th, 1 for 21st)
Y = Year
M = Month
D = Day
H = Hour
M = Minute
S = Second
m = millisecond
Use Count The number of open table spaces and index spaces in this buffer pool. Valid entry is an integer of up to four digits.
Vert Deferred Write Thresh The vertical deferred write threshold for the virtual buffer pool - VDWQT. This is the percentage of the buffer pool that might be occupied by updated pages from a single data set. Valid entry is an integer of up to four digits.
VP Buffers Allocated The number of pages allocated to the virtual buffer pool. Valid entry is an integer of up to four digits.
VP Buffers Delete The number of pages to be deleted from an active virtual buffer pool as a result of pool contraction. Valid entry is an integer of up to four digits.
VP Parallel Seq Thresh The parallel I/O sequential threshold - VPPSEQT. This threshold determines how much of the virtual buffer pool might be used for parallel I/O operations. It is a percentage of the VPSEQT. If set to zero, I/O parallelism is disabled. Valid entry is an integer of up to four digits.
VP Sequential Thresh The sequential steal threshold for the virtual buffer pool - VPSEQT. This is the percentage of the virtual buffer pool that might be occupied by sequentially accessed pages. If set to zero, prefetch is disabled. Valid entry is an integer of up to four digits.
VP Size The size of the virtual buffer pool. Valid entry is an integer of up to four digits.
Workfile Maximum The maximum number of work files that were allocated during sort/merge processing during the current statistics period. Valid entry is an integer of up to four digits.