Firebird 删除非常慢

Question

我做这个简单的交易：

DELETE FROM ominve01 
WHERE CVE_OBS IN (SELECT CVE_OBS 
                  FROM minve01 M 
                  WHERE M.FECHA_DOCU < '31.12.2010' 
                  OR FECHA_DOCU > '31.12.2015')

minve01 有 189k 行
ominve01 有 86k 行

但完成删除大约需要 2 1/2 小时。我的查询不好吗？我该如何改进它？

或者我怎样才能提高交易速度？

ominve01.cve_obs 是 pk
minve01.cve_obs不是pk

Answer 1

DELETE FROM ominve01 N 
WHERE 
exists(SELECT * FROM minve01 M 
       WHERE M.FECHA_DOCU < '31.12.2010' 
       OR FECHA_DOCU > '31.12.2015' and
N.CVE_OBS=M.CVE_OBS)

或执行块（您需要更正变量类型）

execute block
as
declare variable v integer;
begin
for SELECT M.CVE_OBS 
                  FROM minve01 M 
                  WHERE M.FECHA_DOCU < '31.12.2010' 
                  OR FECHA_DOCU > '31.12.2015'
into :v do delete from ominve01 WHERE CVE_OBS=:v;
end

Firebird 删除非常慢

Firebird delete very slow

sql

firebird

firebird2.5