小弟这里有一个SQL查询非常慢,大佬看一下有没有什么办法能优化一下?
各个表的数据量分别为
ic_file_proc_state ps; 3700000
og_file_audit ps; 300000
ic_file_audit ps; 2800008
SELECT
ps.ic_file_nm,
ps.BIZ_LINE,
ps.DB_INSR_TM,
ps.state,
ps.cdr_count,
fa.cdr_count fa_cdr_count,
fa.ic_file_chg_intax fa_ic_file_chg_intax,
fa.tap_format fa_tap_format,
oa.rec_count oa_rec_count,
oa.chg_intax oa_chg_intax,
oa.tap_format oa_tap_format
FROM (SELECT
ps.ic_file_nm,
ps.BIZ_LINE,
ps.DB_INSR_TM,
ps.state,
ps.cdr_count
FROM ic_file_proc_state ps) ps
LEFT JOIN ic_file_audit fa
ON ps.ic_file_nm = fa.ic_file_nm
LEFT JOIN og_file_audit oa
ON ps.ic_file_nm = oa.OG_FILE_NM
WHERE ps.state IN (1, 2, 3, 4)