批量更新执行中的更新查询需要很长时间

Question

System.out.println("multipleBatchUpdateCheckErroreValues.update starting time------"+ new DateTime());     
multipleBatchUpdateCheckError(
            vSql.toString(),  //sql query
            pPriceMap.toList(), //rows
            50, //batch size
            new ObjectPreparedStatementSetter() {
              public void setValues(Object row, PreparedStatement ps, int rowNo) throws SQLException {
                Price vPrice = (Price) row;
                prepareValues(vPrice, ps, UPDATE);
              }
            });
        }
System.out.println("multipleBatchUpdateCheckErroreValues.update ending time------"
            + new DateTime());

在上面的代码中，更新需要太多时间才能完成。如何优化下面的代码执行时间？

SQL查询是

UPDATE PRICE_T
   SET TO_TIME = ?,
       PRICE_EXCLUDING_TAX = ?,
       PRICE_INCLUDING_TAX = ?,
       REASON = ?,
       PRIORITY_TYPE = ?,
       TRANS_TIME = ?,
       DEL_TIME = ?,
       UPD_TIME = ?
 WHERE CLASS = ?
   and CLASS_TYPE = ?
   and COUNTRY_CODE = ?
   and ITEM_NO = ?
   and ITEM_TYPE = ?
   and CURRENCY_CODE = ?
   and PRICE_TYPE = ?
   and FROM_TIME = ?

总行10k，第14列，处理时间为35分钟。

Answer 1

在where子句的所有8列上创建索引之后，执行时间减少到1秒。