总体数据库性能受到最繁忙的磁盘的带宽的限制。
Your overall database performance is limited by the bandwidth of your busiest disks.
总体数据库共享内存(由database_memory配置参数控制)。
Total database Shared memory (controlled by the database_memory configuration parameter).
单行模式提供较少的总体数据库查询操作量，能在每次更新时向数据库推送更多的数据。
A single row schema provides fewer database queries overall and pushes more data to the database with each update.
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