Sql server 这很重要。它可能很大。（我的第一条评论。我想我必须得50分。）即使有索引，也会进行表扫描。no，服务器将cast（最后更新为日期）转换为范围搜索并使用索引。但它无法计算统计数据，因此很可能连接策略不会达到最佳状态。我使用了“覆盖”一词。我也许应该说这使得查

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这很重要。它可能很大。（我的第一条评论。我想我必须得50分。）

即使有索引，也会进行表扫描。

no，服务器将

cast（最后更新为日期）

转换为范围搜索并使用索引。但它无法计算统计数据，因此很可能连接策略不会达到最佳状态。我使用了“覆盖”一词。我也许应该说这使得查询不可搜索，以避免与覆盖索引混淆。但是如果它使用范围搜索和索引，它是可搜索的吗？

 jdbcTemplate.batchUpdate(purgeQueryArray)

@Scheduled(cron = "${scheduler.expression}", zone = "GMT")
    @SchedulerLock(name = "SCHEDULER_LOCK", lockAtLeastFor = "10S", lockAtMostFor = "5M")
    public void purge() {
       // prepare array of queries purgeQueryArray
       jdbcTemplate.batchUpdate(purgeQueryArray)

    }

DELETE FROM BATCH_STEP_EXECUTION_CONTEXT WHERE STEP_EXECUTION_ID IN (SELECT BE.STEP_EXECUTION_ID FROM BATCH_STEP_EXECUTION BE 
join BATCH_STEP_EXECUTION_CONTEXT BEC on BE.STEP_EXECUTION_ID = BEC.STEP_EXECUTION_ID
where CAST(LAST_UPDATED as date) < DATEADD(day, -7, GETDATE()));

DELETE FROM BATCH_STEP_EXECUTION WHERE JOB_EXECUTION_ID IN (SELECT JOB_EXECUTION_ID FROM BATCH_JOB_EXECUTION
where CAST(LAST_UPDATED as date) < DATEADD(day, -7, GETDATE()));

DELETE FROM BATCH_JOB_EXECUTION_CONTEXT WHERE JOB_EXECUTION_ID IN (SELECT JOB_EXECUTION_ID FROM  BATCH_JOB_EXECUTION
where CAST(LAST_UPDATED as date) < DATEADD(day, -7, GETDATE()));

DELETE FROM BATCH_JOB_EXECUTION_PARAMS WHERE JOB_EXECUTION_ID IN (SELECT JOB_EXECUTION_ID FROM BATCH_JOB_EXECUTION
where CAST(LAST_UPDATED as date) < DATEADD(day, -7, GETDATE()));

DELETE FROM BATCH_JOB_EXECUTION WHERE CAST(LAST_UPDATED as date) < DATEADD(day, -7, GETDATE());

DELETE FROM BATCH_JOB_INSTANCE WHERE JOB_INSTANCE_ID NOT IN (SELECT JOB_INSTANCE_ID FROM BATCH_JOB_EXECUTION);

DELETE BEC
FROM BATCH_STEP_EXECUTION_CONTEXT BEC
INNER JOIN BATCH_STEP_EXECUTION BE 
ON BE.STEP_EXECUTION_ID = BEC.STEP_EXECUTION_ID
WHERE LAST_UPDATED < @LAST_UPDATED_LIMIT -- uncover the column if possible