·如果客户的实际应用还存在大量较高并发的小 IO 操作，比如随机 查询，可以考虑 SSD+SAS+ 表空间的方式，并将随机 IO 类应用对 应的表放在 SSD 设备上，从而有效的隔离底层 IO，达到更好 SLA。 某电信用户存在大量对 400 个字段以上大宽表的随机查询场景，之 前由于 IO 资源争用，在批量作业调起时随机查询响应时间显著增加， 通过这种方式改造后，达到了很好的效果。 ·预留一台硬件服务

interrupted during the planned maintenance time, and that the maintenance window can fit into your SLA requirements, there are some settings you must specify when putting a host into maintenance mode:

interrupted during the planned maintenance time, and that the maintenance window can fit into your SLA requirements, there are some settings you must specify when putting a host into maintenance mode:

interrupted during the planned maintenance time, and that the maintenance window can fit into your SLA requirements, there are some settings you must specify when putting a host into maintenance mode:

interrupted during the planned maintenance time, and that the maintenance window can fit into your SLA requirements, there are some settings you must specify when putting a host into maintenance mode:

interrupted during the planned maintenance time, and that the maintenance window can fit into your SLA requirements, there are some settings you must specify when putting a host into maintenance mode:

interrupted during the planned maintenance time, and that the maintenance window can fit into your SLA requirements, there are some settings you must specify when putting a host into maintenance mode: