Identifying Read/Write (I/O) Problems - Database-优快云博客

本文链接：https://blog.youkuaiyun.com/scmaxyes/article/details/42709323

本文介绍了如何通过均匀分布数据库读写活动来避免I/O瓶颈，提供了Oracle数据库性能关键指标的查询路径，并列举了高负载文件及数据库对象示例。

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To achieve optimal database performance, 110 activity (read/write accesses) should be evenly distributed on the database's hard drives. You should avoid hot spots.

You can find important key figures on the 110 performance for an Oracle database in the DBA Cockpit via the following menu path:
PERFORMANCE • WAIT EVENT ANALYSIS • FILESYSTEM REQUESTS

There is a risk of an I/O bottleneck if individual drives show very high levels of utilization (UTIL. > 50% for hourly average)

You can resolve an I/0 bottleneck by improving the table distribution on the file system. In particular, ensure that the disks with high load contain no additional. frequently accessed files that could be relocated.

Examples of Files and Database Objects with High Read/Write Activity

Database System	File or Database Object
Independent	Operating system swap space(high priority)
SAP MaxDB	Log area, system devspace
DB2	Online log directory (high priority) Offline log directory (medium priority)
Oracle	Redo log files (high priority) Tablespace PSAPROLL (medium priority)Directory for the offline redo log files (SAP ARCH)(medium priority)
SQL Server	Transaction log (high priority) Tempdb (medium priority)