oracle - Oracle：非常慢的查询示例。如何通过查看会话浏览器来加快速度？

Question

我将在各个方面详细说明一个非常慢的查询。你能给我一些建议来了解我应该考虑什么来加快速度吗？

它只涉及两个表。

  SELECT /*+ leading(tb) */![enter image description here][1]
        DISTINCT COUNT (huB.FLH_ID_MESSAGGIO), hub.flh_STATO, TB.LOTTO
    FROM ENI_FLUSSI_HUB HUB, NETATEMP.TMP_GAB_RECOVERY_SCARTI tb
   WHERE     HUB.FLH_ID_MESSAGGIO = tb.FLH_ID_MESSAGGIO
         AND hub.FLH_TIPO_PROCESSO_COD = tb.FLH_TIPO_PROCESSO_COD
         AND TB.LOTTO IN (:"SYS_B_0", :"SYS_B_1", :"SYS_B_2", :"SYS_B_3")
         AND HUB.FLH_FLAG_ANN = :"SYS_B_4"
GROUP BY hub.flh_STATO, TB.LOTTO
ORDER BY HUB.FLH_STATO

第一个索引脚本：

CREATE INDEX NETATEMP.ENI_ETAI_IDX2 ON NETATEMP.TMP_GAB_RECOVERY_SCARTI
(LOTTO, OPERATORE)
NOLOGGING
TABLESPACE NETATEMP_IDXTI
PCTFREE    10
INITRANS   2
MAXTRANS   255
STORAGE    (
            INITIAL          64K
            NEXT             1M
            MINEXTENTS       1
            MAXEXTENTS       UNLIMITED
            PCTINCREASE      0
            BUFFER_POOL      DEFAULT
            FLASH_CACHE      DEFAULT
            CELL_FLASH_CACHE DEFAULT
           )
NOPARALLEL;