Question

我遇到错误（发生ORA-01000的次数比其他错误多）-

ORA-01000：已超出打开游标的最大数量
ORA-00604：递归SQL级别1发生错误
[ne.jdbc.spi.SqlExceptionHelper]-不再需要从套接字读取数据

我将尝试解释我正在运行的代码方案。

服务调用DAO层以删除我通过主记录的记录键来查找和删除表格。

@Transactional(value = "txManagerResult")
public void deleteCalculatedLkmsEntities(final List<Long> chkdLkmsIds) {
    this.daoResult. deleteCalculatedLkmsEntitiesEnhanced(chkdLkmsIds);
}

DAO方法可从4个表（具有父级和子级）中删除记录数据上的关系，但表上未维护此关系（即没有外键关系）。

private void deleteCalculatedLkmsEntitiesEnhanced(final List<Long> chkdLkmsIds) {

     // Order of the delete is must be maintained as below 

     // this will delete  around 100000 rows for 1000 primary key of parent table
     this.deleteEntitiesByPrimaryKeyList("delete from Child_Table_4 where CHKD_PRODUCT_OFFERING_ID in ( "
                   + " select ID from Child_Table_2 where CHKD_LKMS_ID in ( "
                   + "select ID from Parent_Table_1 where id in (:pid) "
                   + ") )"
                   , "pid",
                   chkdLkmsIds);

// this will delete  around 100000 rows for 1000 primary key of parent table
     this.deleteEntitiesByPrimaryKeyList("delete from Child_Table_3 where CHKD_PRODUCT_OFFERING_ID in ( "
                   + " select ID from Child_Table_2 where CHKD_LKMS_ID in ( "
                   + "select ID from Parent_Table_1 where id in (:pid) "
                   + ") )"
                   , "pid",
                   chkdLkmsIds);

// this will delete  around 300000 rows for 1000 primary key of parent table
     this.deleteEntitiesByPrimaryKeyList("delete from Child_Table_2 where CHKD_LKMS_ID in ( "
                   + "select ID from Parent_Table_1 where id in (:pid) )"
                   , "pid",
                   chkdLkmsIds);

     // this will delete around 1000 rows
     this.deleteEntitiesByPrimaryKeyList("delete from Parent_Table_1 where ID in (:pid)"
                   , "pid",
                   chkdLkmsIds);

} 
private void deleteEntitiesByPrimaryKeyListFromDB(final String query, final String parameter,
            final List<Long> idsToDelete) {
     this.entityManager.createNativeQuery(query)
     .setParameter(parameter, idsToDelete).executeUpdate();
   }

由4个由ForkJoinPool管理的并行线程调用该服务方法。

错误不会在应用程序启动后立即出现，而是在执行代码10个小时后开始出现。上面的方法使线程以循环方式保持运行（删除记录）。运行此过程以完成900万条记录的执行。

请帮助。

Answer 1

查看所有评论。由于大量并行调用，它可能会发生。假设em.createNativeQuery（）正在正确处理数据库资源生命周期。如果使用的是oracle DB，则最大打开游标有限制。您可以在数据库级别增加打开的游标的最大数目以解决此问题。

JPA中的最大打开游标超出了异常（使用createNativeQuery删除记录）

1 个答案: