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Retentive Refresh

I just saw a make_ahm_now() statement fail with the error "AHM can't be set while retentive refresh is running."


What exactly is a retentive refresh?


  • SruthiASruthiA Vertica Employee Employee



          Retentive refresh is used if projection has up to date buddy projections. When retentive refresh is running, you cannot advance AHM.




    Thank you,


  • Hi Sruthi,


    Thanks for the reply!  How often do these refreshes run?





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