[DATABASE/POSTGRESQL] CACHE에 있는 인덱스 조회하기

■ CACHE에 있는 인덱스를 조회하는 방법을 보여준다.

▶ 예제 코드 (SQL)


SELECT
    SUM(IDX_BLKS_READ)                                           AS IDX_READ
   ,SUM(IDX_BLKS_HIT)                                            AS IDX_HIT
   ,(SUM(IDX_BLKS_HIT) - SUM(IDX_BLKS_READ)) / SUM(IDX_BLKS_HIT) AS RATIO
FROM PG_STATIO_USER_INDEXES;

SELECT

SUM(IDX_BLKS_READ) AS IDX_READ

,SUM(IDX_BLKS_HIT) AS IDX_HIT

,(SUM(IDX_BLKS_HIT) - SUM(IDX_BLKS_READ)) / SUM(IDX_BLKS_HIT) AS RATIO

FROM PG_STATIO_USER_INDEXES;