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Analyzing buffer pools


Use the following procedure to analyze buffer pools for the target Db2.

To analyze buffer pools for the target Db2

  1. From EZDB2, hyperlink on Buffer Pools to see a list of all defined pools with allocated space, utilization, and getpage rates.

     >W1 =BFRPL=============DEEO=====*========ddmmmyyyy==11:44:54====MVDB2====D===39
     Pool   DB2      Vpool Vpool  SPool  Getpg   Interval   Session    Previous   %
     Name   Target    Size Alloc   Size   /sec   Getpages   Getpages   Getpages  Ac
     BP0    DEEO      2000  2000      0    0.0         12        962        950    
     BP1    DEEO      1000            0    0.0          0          0          0    
     BP2    DEEO      1000            0    0.0          0          0          0    
     BP3    DEEO      1000            0    0.0          0          0          0    
     BP4    DEEO      1000            0    0.0          0          0          0    
     BP5    DEEO      1000            0    0.0          0          0          0    
     BP6    DEEO      1000            0    0.0          0          0          0    
     BP7    DEEO      1000            0    0.0          0          0          0    
     BP8    DEEO      1000            0    0.0          0          0          0    
     BP9    DEEO      1000            0    0.0          0          0          0    
     BP10   DEEO      1000            0    0.0          0          0          0    
     BP11   DEEO      1000            0    0.0          0          0          0    
     BP12   DEEO      1000            0    0.0          0          0          0
  2. Hyperlink on Pool Name to see all status and statistics for one pool.Both interval and session counts are shown.

    >W1 =BFRPL====BFRPLXD==DEEO=====*========ddmmmyyyy==11:44:54====MVDB2====D====1
    Buffer Pool Statistics Detail.....                                            
     Pool Name.........................              BP0                           
     VP Size...........................             2000                           
     Simulated Pool Size...............                0                           
     Virtual Pool Sequential Threshold.               80                           
     Deferred Write Threshold..........               30                           
     Vertical Write Threshold..........                5                           
     Vertical Write Threshold (Buffers)                0                           
     Parallel Sequential Threshold.....               50                           
     Assisting Parallel Threshold......                0                           
     Page Steal Algorithm..............              LRU                           
     Page Fix Attribute Y/N............                N                           
     Autosize Attribute Y/N............                N                           
     Minimum Pool Size.................                0                           
     Maximum Pool Size.................                0                           
     Frame size........................               4K                           
                                                Interval           Session         
     Virtual Pool Allocation...........                                            
       Buffers Allocated...............                               2000         
       Current Active Buffers..........                                 16
  3. Scroll down with F8 to see all of the data.
  4. Press F3 to return to BFRPL.
  5. Locate current and session ratios for one pool:
    1. Hyperlink on Getpg/sec.A list of current hit ratios per pool is displayed, BFRPLH.
    2. Hyperlink on Pool Name.A list of current and session ratios for one pool is displayed.

      >W1 =BFRPLHD===========DLY6=====*========ddmmmyyyy==05:23:38====MVDB2====D====1
       Buffer Pool Hit Ratios........                                                
       Pool Name..................... BP0                                            
                                      Interval   Session                             
       Hit Ratios....................                                                
        VPOOL Hit Ratio % with P/F...    81.58     42.37                             
        VPOOL Hit Ratio % without P/F    81.58     69.42                             
        GBP Hit Ratio %..............    12.50      7.68                             
       Activity per Second...........                                                
        Getpages.....................     0.07      0.34                             
        Page Updates.................     0.01      0.02                             
        Sync I/O.....................     0.01      0.09                             
        Prefetch I/O.................     0.00      0.00                             
        Write I/O....................     0.00      0.00                             
        Data Set Opens...............     0.00      0.00                             
        zHyperlink Read I/O..........     0.00      0.00                             
         Read I/O DASD Cache Hits....     0.01      0.08                             
  6. Press F3 to return to EZDB2.Group buffer pools are discussed later in the data sharing section.

 

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BMC AMI Ops Monitor for Db2 12.2