Database Administration (MOSC)

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Execution Plan Review

edited Apr 14, 2026 12:58AM in Database Administration (MOSC) 3 commentsAnswered

Dear Team,

Can you please kindly help us in understanding the below execution plan. We are on 19.28 oracle version.

SELECT HDR.EMBOOK_HEADER_ID, APRV.MAX_APRV_REQUEST_ID MAX1_APRV,
SUB.MAX_SUB_REQUEST_ID MAX2_SUB FROM XX_APEX.XXTTD_APEX_EMBOOK_HDR_TAB
HDR LEFT JOIN ( SELECT BILL_HEADER_ID, MAX(REQUEST_ID) AS
MAX_APRV_REQUEST_ID FROM XX_APEX.XXTTD_AP_EMBOOK_APRVL_TRNS_TAB WHERE
PROCESS_ID = 20 GROUP BY BILL_HEADER_ID ) APRV ON APRV.BILL_HEADER_ID =
HDR.EMBOOK_HEADER_ID LEFT JOIN ( SELECT EMBOOK_HEADER_ID,
MAX(REQUEST_ID) AS MAX_SUB_REQUEST_ID FROM

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