我正在使用 MySQLTuner.pl 来优化我的网站....虽然我不完全确定如何解决其中一些问题，并且想知道是否有人可以帮助我。
如果需要使用以下 MySQL 设置的 MySQL，我有大约 4GB 的可用内存：
key_buffer = 100M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 800
myisam-recover = BACKUP
max_connections = 750
table_cache = 125000
thread_concurrency = 500
query_cache_type=1
query_cache_limit = 128M
query_cache_size = 128M
tmp_table_size = 300M
max_heap_table_size = 300M
innodb_buffer_pool_size = 2G
innodb_file_per_table = 0
innodb_flush_log_at_trx_commit = 2
这是我的调谐器的输出
-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.5.24-0ubuntu0.12.04.1
[OK] Operating on 64-bit architecture
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 7K (Tables: 10)
[--] Data in InnoDB tables: 27M (Tables: 5)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17)
[!!] Total fragmented tables: 5
-------- Security Recommendations -------------------------------------------
[OK] All database users have passwords assigned
-------- Performance Metrics -------------------------------------------------
[--] Up for: 15d 5h 4m 19s (1B q [1K qps], 208M conn, TX: 172B, RX: 98B)
[--] Reads / Writes: 71% / 29%
[--] Total buffers: 2.5G global + 2.7M per thread (750 max threads)
[OK] Maximum possible memory usage: 4.5G (57% of installed RAM)
[OK] Slow queries: 0% (0/1B)
[OK] Highest usage of available connections: 15% (118/750)
[OK] Key buffer size / total MyISAM indexes: 100.0M/119.0K
[OK] Key buffer hit rate: 100.0% (22M cached / 0 reads)
[!!] Query cache efficiency: 0.1% (703K cached / 519M selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (13 temp sorts / 13M sorts)
[OK] Temporary tables created on disk: 25% (4M on disk / 18M total)
[OK] Thread cache hit rate: 99% (752 created / 208M connections)
[OK] Table cache hit rate: 74% (992 open / 1K opened)
[OK] Open file limit used: 0% (68/250K)
[OK] Table locks acquired immediately: 100% (216M immediate / 216M locks)
[OK] InnoDB data size / buffer pool: 27.8M/2.0G
-------- Recommendations -----------------------------------------------------
General recommendations:
Run OPTIMIZE TABLE to defragment tables for better performance
Enable the slow query log to troubleshoot bad queries
Variables to adjust:
query_cache_limit (> 128M, or use smaller result sets)
的输出SHOW STATUS LIKE '%cache%'是
Binlog_cache_disk_use 0
Binlog_cache_use 0
Binlog_stmt_cache_disk_use 0
Binlog_stmt_cache_use 0
Com_assign_to_keycache 0
Qcache_free_blocks 19
Qcache_free_memory 134026728
Qcache_hits 704192
Qcache_inserts 143569852
Qcache_lowmem_prunes 0
Qcache_not_cached 11043040
Qcache_queries_in_cache 94
Qcache_total_blocks 217
Ssl_callback_cache_hits 0
Ssl_session_cache_hits 0
Ssl_session_cache_misses 0
Ssl_session_cache_mode NONE
Ssl_session_cache_overflows 0
Ssl_session_cache_size 0
Ssl_session_cache_timeouts 0
Ssl_used_session_cache_entries 0
Threads_cached 748
有什么我还可以改进以获得更好的性能吗？
谢谢