数据库性能分析与优化（爱测未来团队内训材料）

爱被打了一巴掌 2024-04-18 08:29 4阅读 0赞

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![format_png 8][]内存管理方式：MSMM、ASMM(sga\_target)、AMM(memory\_target) 小内存有小内存的问题，大内存有大内存的麻烦！ORA-04031 Buffer cache 和 sharedpool size 的 begin/end值在 ASMM、AMM 和 11gR2MSMM 下可是会动

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Parses 解析次数，包括软解析+硬解析，我们希望的是 解析一次 到处运行！HardParses 万恶之源．Cursorpin s on X， librarycache: mutex X ， latch: row cache objects /sharedpool……………..。硬解析最好少于每秒 20 次

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log file sync：一般此类等待时间是由于 LGWR 进程讲 redo log buffer 写入 redo log 中发生。

commit次数是否过多

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有的组件对响应时间要求比较高，测试过程中我们应将慢查询阈值，设置尽量小。

有的SQL可能是做一些统计用的，没有实时性的要求，这时在测试时，慢查询阈值可以设置高一点。

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Statspack-生成快照

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建议:计算一下使用率：10% < 连接数使用率 < 85% .

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10046 trace来跟踪Oracle

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1、索引是用来提高查询SQL性能的，但有些情况下的查询是无法使用索引的，建了也没用

2、接下来我们看下我们常用的查询类型有哪些。

3、不同类型的查询，建立索引时我们需要注意些什么

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1、不同的存储引擎支持的索引方法不同

2、这里以InnoDB引擎，支持的Btree索引为例说明

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这里不我们不光查询条件firstname要加索引，排序的字段也需要加入索引

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1、对查询结果使用group by进行分组时，需要加索引。

2、使用distinct进行唯一性查询时，firstname字段虽然不是作为查询条件，需要加入索引。

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左连接：以左表为基准（左表取的是全部数据），到右表按条件匹配数据。搜索条件都在右表启作用，所以索引建立在右表。

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（喜欢请转发，谢谢！）

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