GV$PGA_TARGET_ADVICE_HISTOGRAM definition in Oracle Database 11.2
GV$PGA_TARGET_ADVICE_HISTOGRAM

select
  INST_ID,                                 -- INST_ID NUMBER
  PAT_PRED * 1024,                         -- PGA_TARGET_FOR_ESTIMATE NUMBER
  round(PAT_PRED/PAT_CURR, 4),             -- PGA_TARGET_FACTOR NUMBER
  decode(status, 0, 'OFF', 'ON'),          -- ADVICE_STATUS VARCHAR2(3)
  LOWBND * 1024,                           -- LOW_OPTIMAL_SIZE NUMBER
  (HIBND * 1024)-1,                        -- HIGH_OPTIMAL_SIZE NUMBER
  OPTIMAL,                                 -- ESTD_OPTIMAL_EXECUTIONS NUMBER
  ONEPASS,                                 -- ESTD_ONEPASS_EXECUTIONS NUMBER
  MPASS,                                   -- ESTD_MULTIPASSES_EXECUTIONS NUMBER
  MPASS+ONEPASS+OPTIMAL,                   -- ESTD_TOTAL_EXECUTIONS NUMBER
  IGNORED                                  -- IGNORED_WORKAREAS_COUNT NUMBER
from
  X$QESMMAHIST

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