[DATABASE/POSTGRESQL] CACHE HIT 비율 조회하기

icodebroker POSTGRESQL 2024-06-18

■ CACHE HIT 비율을 조회하는 방법을 보여준다.

▶ 예제 코드 (SQL)


SELECT
    SUM(HEAP_BLKS_READ)                                             AS HEAP_READ
   ,SUM(HEAP_BLKS_HIT)                                              AS HEAP_HIT
   ,(SUM(HEAP_BLKS_HIT) - SUM(HEAP_BLKS_READ)) / SUM(HEAP_BLKS_HIT) AS RATIO
FROM PG_STATIO_USER_TABLES;

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SELECT

SUM(HEAP_BLKS_READ) AS HEAP_READ

,SUM(HEAP_BLKS_HIT) AS HEAP_HIT

,(SUM(HEAP_BLKS_HIT) - SUM(HEAP_BLKS_READ)) / SUM(HEAP_BLKS_HIT) AS RATIO

FROM PG_STATIO_USER_TABLES;