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mysql - 如何配置mysql服务器（提高速度）

问题描述

我的数据库大小为 13.4Gb。服务器有 32 GB 的 RAM。

但是查询类型选择仍然很慢。

我启动了 mysqltuner，他发出以下消息：

-------- Performance Metrics -------------------------------------------------
[--] Up for: 5s (9 q [1.800 qps], 7 conn, TX: 17K, RX: 1K)
[--] Reads / Writes: 100% / 0%
[--] Binary logging is disabled
[--] Total buffers: 24.5G global + 392.4M per thread (64 max threads)
[OK] Maximum reached memory usage: 24.9G (79.27% of installed RAM)
[!!] Maximum possible memory usage: 49.0G (156.10% of installed RAM)
[OK] Slow queries: 0% (0/9)
[OK] Highest usage of available connections: 1% (1/64)
[!!] Aborted connections: 14.29%  (1/7)
[!!] Query cache efficiency: 0.0% (0 cached / 4 selects)
[OK] Query cache prunes per day: 0
[OK] Temporary tables created on disk: 0% (0 on disk / 2 total)
[OK] Thread cache hit rate: 85% (1 created / 7 connections)
[OK] Table cache hit rate: 93% (100 open / 107 opened)
[OK] Open file limit used: 0% (15/1M)
[OK] Table locks acquired immediately: 100% (100 immediate / 100 locks)
-------- InnoDB Metrics -----------------------------------------------------
[--] InnoDB is enabled.
[OK] InnoDB buffer pool / data size: 23.4G/13.4G
[!!] InnoDB buffer pool instances: 24
[!!] InnoDB Used buffer: 0.03% (414 used/ 1535976 total)
[!!] InnoDB Read buffer efficiency: 79.34% (1463 hits/ 1844 total)
[!!] InnoDB Write buffer efficiency: 0.00% (0 hits/ 1 total)
[OK] InnoDB log waits: 0.00% (0 waits / 2 writes)

我有以下服务器mysql配置：

key_buffer_size = 1024M
sort_buffer_size = 256M
max_allowed_packet = 1024M
read_buffer_size = 8M
read_rnd_buffer_size = 128M
thread_stack = 128K
query_cache_limit = 1M
query_cache_size = 8M
query_cache_type = 1
thread_cache_size = 16
max_heap_table_size = 128M
tmp_table_size = 64M
net_read_timeout = 3600
net_write_timeout = 3600
wait_timeout = 120
interactive_timeout = 120
table_open_cache = 1024M
#join_buffer_size=2048M
max_connections        = 64
innodb_open_files = 4096
innodb_file_per_table = 1
innodb_flush_method=O_DIRECT
innodb_flush_log_at_trx_commit=2
innodb_log_file_size = 512M
innodb_log_buffer_size = 16M
innodb_buffer_pool_size=24000M
innodb_buffer_pool_instances=24
innodb_buffer_pool_chunk_size = 500M
#innodb_additional_mem_pool_size = 20M
#innodb_thread_concurrency = 16
innodb_read_io_threads = 8
innodb_write_io_threads = 8
innodb_stats_on_metadata = 0
#innodb_io_capacity=2000
innodb_data_file_path=ibdata1:10M:autoextend

您能否告诉我如何正确纠正以下错误并提高从数据库中采样的速度？

[!!] InnoDB buffer pool instances: 24
[!!] InnoDB Used buffer: 0.03% (414 used/ 1535976 total)
[!!] InnoDB Read buffer efficiency: 79.34% (1463 hits/ 1844 total)
[!!] InnoDB Write buffer efficiency: 0.00% (0 hits/ 1 total)
[!!] Maximum possible memory usage: 49.0G (156.10% of installed RAM)
[!!] Aborted connections: 14.29%  (1/7)

PS 我不使用索引，因为它增加了查询超时并增加了数据库的大小。

标签： mysql

解决方案

我可能会在这里留下所有帮助我解决这个问题的有用答案。

  1. 始终验证指定的服务器配置值是否正确

  2. 如果你需要快速类型的请求——select，你需要牺牲磁盘的大小。

  3. 正确的数据库结构将避免复杂的查询并提高性能。

  4. 有必要尝试执行不大且不合逻辑的小型逻辑查询。
  5. 如果请求不正确，服务器的配置对请求的速度影响不大。
  6. 理想情况下，应该使用哈希，而不是索引）
  7. 在新版的肌肉中，尽量多使用——WITH table as (SELECT)
  8. 阅读一本书 - Dan Tow 的“SQL 调优”，ISBN 0-596-00573-3

我不能挑出一条对我有帮助的特别建议，因为它们都很好。

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