本篇内容主要讲解“怎么使用PostgreSQL的配置参数checkpoint_flush_after”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么使用PostgreSQL的配置参数checkpoint_flush_after”吧!
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在CentOS 7.x下使用sysbench测试,尝试0/256kB/2MB,只有可以忽略不计的细微区别.
------------------------------------- checkpoint_flush_after = 2MB ------------------------------------- SQL statistics: queries performed: read: 107367 write: 111268 other: 16840 total: 235475 transactions: 8419 (84.16 per sec.) queries: 235475 (2353.96 per sec.) ignored errors: 43 (0.43 per sec.) reconnects: 0 (0.00 per sec.) Throughput: events/s (eps): 84.1616 time elapsed: 100.0337s total number of events: 8419 Latency (ms): min: 2.56 avg: 23.76 max: 311.66 95th percentile: 62.19 sum: 200002.13 Threads fairness: events (avg/stddev): 4209.5000/48.50 execution time (avg/stddev): 100.0011/0.00 ------------------------------------- checkpoint_flush_after = 256kB ------------------------------------- SQL statistics: queries performed: read: 110021 write: 114168 other: 17072 total: 241261 transactions: 8535 (85.31 per sec.) queries: 241261 (2411.50 per sec.) ignored errors: 29 (0.29 per sec.) reconnects: 0 (0.00 per sec.) Throughput: events/s (eps): 85.3106 time elapsed: 100.0462s total number of events: 8535 Latency (ms): min: 2.62 avg: 23.43 max: 260.37 95th percentile: 61.08 sum: 200017.57 Threads fairness: events (avg/stddev): 4267.5000/37.50 execution time (avg/stddev): 100.0088/0.02 ------------------------------------- checkpoint_flush_after = 0 ------------------------------------- SQL statistics: queries performed: read: 111431 write: 115279 other: 17380 total: 244090 transactions: 8689 (86.86 per sec.) queries: 244090 (2440.19 per sec.) ignored errors: 42 (0.42 per sec.) reconnects: 0 (0.00 per sec.) Throughput: events/s (eps): 86.8646 time elapsed: 100.0293s total number of events: 8689 Latency (ms): min: 2.60 avg: 23.02 max: 213.39 95th percentile: 59.99 sum: 199980.96 Threads fairness: events (avg/stddev): 4344.5000/16.50 execution time (avg/stddev): 99.9905/0.00
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