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[ÀϹÝ] mysql Æ©´× ÃÖÀûÈ |
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mysql Æ©´× ÃÖÀûÈ
°³¹ß/mysql 2012/03/23 15:43
mysql>show status;
+------------------------------------------+-------------+
| Variable_name | Value |
+------------------------------------------+-------------+
| Aborted_clients | 0 | Ŭ¶óÀ̾ðÆ® ÇÁ·Î±×·¥ÀÌ ºñ Á¤»óÀûÀ¸·Î Á¾·áµÈ ¼ö
| Aborted_connects | 2 | MySQL ¼¹ö¿¡ Á¢¼ÓÀÌ ½ÇÆÐµÈ ¼ö
| Binlog_cache_disk_use | 0 |
| Binlog_cache_use | 0 |
| Binlog_stmt_cache_disk_use | 0 |
| Binlog_stmt_cache_use | 0 |
| Bytes_received | 320 |
| Bytes_sent | 1298 |
| Com_admin_commands | 0 |
| Com_assign_to_keycache | 0 |
| Com_alter_db | 0 |
| Com_alter_db_upgrade | 0 |
| Com_alter_event | 0 |
| Com_alter_function | 0 |
| Com_alter_procedure | 0 |
| Com_alter_server | 0 |
| Com_alter_table | 0 |
| Com_alter_tablespace | 0 |
| Com_analyze | 0 |
| Com_begin | 0 |
| Com_binlog | 0 |
| Com_call_procedure | 0 |
| Com_change_db | 0 |
| Com_change_master | 0 |
| Com_check | 0 |
| Com_checksum | 0 |
| Com_commit | 0 |
| Com_create_db | 0 |
| Com_create_event | 0 |
| Com_create_function | 0 |
| Com_create_index | 0 |
| Com_create_procedure | 0 |
| Com_create_server | 0 |
| Com_create_table | 0 |
| Com_create_trigger | 0 |
| Com_create_udf | 0 |
| Com_create_user | 0 |
| Com_create_view | 0 |
| Com_dealloc_sql | 0 |
| Com_delete | 0 |
| Com_delete_multi | 0 |
| Com_do | 0 |
| Com_drop_db | 0 |
| Com_drop_event | 0 |
| Com_drop_function | 0 |
| Com_drop_index | 0 |
| Com_drop_procedure | 0 |
| Com_drop_server | 0 |
| Com_drop_table | 0 |
| Com_drop_trigger | 0 |
| Com_drop_user | 0 |
| Com_drop_view | 0 |
| Com_empty_query | 0 |
| Com_execute_sql | 0 |
| Com_flush | 0 |
| Com_grant | 0 |
| Com_ha_close | 0 |
| Com_ha_open | 0 |
| Com_ha_read | 0 |
| Com_help | 0 |
| Com_insert | 0 |
| Com_insert_select | 0 |
| Com_install_plugin | 0 |
| Com_kill | 0 |
| Com_load | 0 |
| Com_lock_tables | 0 |
| Com_optimize | 0 |
| Com_preload_keys | 0 |
| Com_prepare_sql | 0 |
| Com_purge | 0 |
| Com_purge_before_date | 0 |
| Com_release_savepoint | 0 |
| Com_rename_table | 0 |
| Com_rename_user | 0 |
| Com_repair | 0 |
| Com_replace | 0 |
| Com_replace_select | 0 |
| Com_reset | 0 |
| Com_resignal | 0 |
| Com_revoke | 0 |
| Com_revoke_all | 0 |
| Com_rollback | 0 |
| Com_rollback_to_savepoint | 0 |
| Com_savepoint | 0 |
| Com_select | 1 |
| Com_set_option | 0 |
| Com_signal | 0 |
| Com_show_authors | 0 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_charsets | 0 |
| Com_show_collations | 0 |
| Com_show_contributors | 0 |
| Com_show_create_db | 0 |
| Com_show_create_event | 0 |
| Com_show_create_func | 0 |
| Com_show_create_proc | 0 |
| Com_show_create_table | 0 |
| Com_show_create_trigger | 0 |
| Com_show_databases | 0 |
| Com_show_engine_logs | 0 |
| Com_show_engine_mutex | 0 |
| Com_show_engine_status | 0 |
| Com_show_events | 0 |
| Com_show_errors | 0 |
| Com_show_fields | 0 |
| Com_show_function_status | 0 |
| Com_show_grants | 0 |
| Com_show_keys | 0 |
| Com_show_master_status | 0 |
| Com_show_open_tables | 0 |
| Com_show_plugins | 0 |
| Com_show_privileges | 0 |
| Com_show_procedure_status | 0 |
| Com_show_processlist | 0 |
| Com_show_profile | 0 |
| Com_show_profiles | 0 |
| Com_show_relaylog_events | 0 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 3 |
| Com_show_storage_engines | 0 |
| Com_show_table_status | 0 |
| Com_show_tables | 0 |
| Com_show_triggers | 0 |
| Com_show_variables | 0 |
| Com_show_warnings | 0 |
| Com_slave_start | 0 |
| Com_slave_stop | 0 |
| Com_stmt_close | 0 |
| Com_stmt_execute | 0 |
| Com_stmt_fetch | 0 |
| Com_stmt_prepare | 0 |
| Com_stmt_reprepare | 0 |
| Com_stmt_reset | 0 |
| Com_stmt_send_long_data | 0 |
| Com_truncate | 0 |
| Com_uninstall_plugin | 0 |
| Com_unlock_tables | 0 |
| Com_update | 0 |
| Com_update_multi | 0 |
| Com_xa_commit | 0 |
| Com_xa_end | 0 |
| Com_xa_prepare | 0 |
| Com_xa_recover | 0 |
| Com_xa_rollback | 0 |
| Com_xa_start | 0 |
| Compression | OFF |
| Connections | 37065 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 5 |
| Created_tmp_tables | 0 |
| Delayed_errors | 0 |
| Delayed_insert_threads | 0 |
| Delayed_writes | 0 |
| Flush_commands | 1 |
| Handler_commit | 0 |
| Handler_delete | 0 |
| Handler_discover | 0 |
| Handler_prepare | 0 |
| Handler_read_first | 0 |
| Handler_read_key | 0 |
| Handler_read_last | 0 |
| Handler_read_next | 0 |
| Handler_read_prev | 0 |
| Handler_read_rnd | 0 |
| Handler_read_rnd_next | 0 |
| Handler_rollback | 0 |
| Handler_savepoint | 0 |
| Handler_savepoint_rollback | 0 |
| Handler_update | 0 |
| Handler_write | 0 |
| Innodb_buffer_pool_pages_data | 146 |
| Innodb_buffer_pool_pages_dirty | 0 |
| Innodb_buffer_pool_pages_flushed | 0 |
| Innodb_buffer_pool_pages_free | 8045 |
| Innodb_buffer_pool_pages_misc | 0 |
| Innodb_buffer_pool_pages_total | 8191 |
| Innodb_buffer_pool_read_ahead_rnd | 0 |
| Innodb_buffer_pool_read_ahead | 0 |
| Innodb_buffer_pool_read_ahead_evicted | 0 |
| Innodb_buffer_pool_read_requests | 493 |
| Innodb_buffer_pool_reads | 147 |
| Innodb_buffer_pool_wait_free | 0 |
| Innodb_buffer_pool_write_requests | 0 |
| Innodb_data_fsyncs | 3 |
| Innodb_data_pending_fsyncs | 0 |
| Innodb_data_pending_reads | 0 |
| Innodb_data_pending_writes | 0 |
| Innodb_data_read | 4591616 |
| Innodb_data_reads | 157 |
| Innodb_data_writes | 3 |
| Innodb_data_written | 1536 |
| Innodb_dblwr_pages_written | 0 |
| Innodb_dblwr_writes | 0 |
| Innodb_have_atomic_builtins | ON |
| Innodb_log_waits | 0 |
| Innodb_log_write_requests | 0 |
| Innodb_log_writes | 1 |
| Innodb_os_log_fsyncs | 3 |
| Innodb_os_log_pending_fsyncs | 0 |
| Innodb_os_log_pending_writes | 0 |
| Innodb_os_log_written | 512 |
| Innodb_page_size | 16384 |
| Innodb_pages_created | 0 |
| Innodb_pages_read | 146 |
| Innodb_pages_written | 0 |
| Innodb_row_lock_current_waits | 0 |
| Innodb_row_lock_time | 0 |
| Innodb_row_lock_time_avg | 0 |
| Innodb_row_lock_time_max | 0 |
| Innodb_row_lock_waits | 0 |
| Innodb_rows_deleted | 0 |
| Innodb_rows_inserted | 0 |
| Innodb_rows_read | 0 |
| Innodb_rows_updated | 0 |
| Innodb_truncated_status_writes | 0 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 309407 |
| Key_blocks_used | 10513 |
| Key_read_requests | 692545 |
| Key_reads | 109330 |
| Key_write_requests | 24 |
| Key_writes | 24 |
| Last_query_cost | 0.000000 |
| Max_used_connections | 20 | ÃÖ´ë·Î µ¿½Ã¿¡ Á¢¼ÓÇÑ ¼ö
| Not_flushed_delayed_rows | 0 |
| Open_files | 1024 |
| Open_streams | 0 |
| Open_table_definitions | 512 |
| Open_tables | 512 |
| Opened_files | 24756 |
| Opened_table_definitions | 0 |
| Opened_tables | 0 |
| Performance_schema_cond_classes_lost | 0 |
| Performance_schema_cond_instances_lost | 0 |
| Performance_schema_file_classes_lost | 0 |
| Performance_schema_file_handles_lost | 0 |
| Performance_schema_file_instances_lost | 0 |
| Performance_schema_locker_lost | 0 |
| Performance_schema_mutex_classes_lost | 0 |
| Performance_schema_mutex_instances_lost | 0 |
| Performance_schema_rwlock_classes_lost | 0 |
| Performance_schema_rwlock_instances_lost | 0 |
| Performance_schema_table_handles_lost | 0 |
| Performance_schema_table_instances_lost | 0 |
| Performance_schema_thread_classes_lost | 0 |
| Performance_schema_thread_instances_lost | 0 |
| Prepared_stmt_count | 0 |
| Qcache_free_blocks | 202 |
| Qcache_free_memory | 491240 |
| Qcache_hits | 1554 |
| Qcache_inserts | 55576 |
| Qcache_lowmem_prunes | 54074 |
| Qcache_not_cached | 2 |
| Qcache_queries_in_cache | 1059 |
| Qcache_total_blocks | 5439 |
| Queries | 169672 |
| Questions | 7 |
| Rpl_status | AUTH_MASTER |
| Select_full_join | 0 |
| Select_full_range_join | 0 |
| Select_range | 0 |
| Select_range_check | 0 |
| Select_scan | 0 |
| Slave_heartbeat_period | 0.000 |
| Slave_open_temp_tables | 0 |
| Slave_received_heartbeats | 0 |
| Slave_retried_transactions | 0 |
| Slave_running | OFF |
| Slow_launch_threads | 0 |
| Slow_queries | 0 |
| Sort_merge_passes | 0 |
| Sort_range | 0 |
| Sort_rows | 0 |
| Sort_scan | 0 |
| Ssl_accept_renegotiates | 0 |
| Ssl_accepts | 0 |
| Ssl_callback_cache_hits | 0 |
| Ssl_cipher | |
| Ssl_cipher_list | |
| Ssl_client_connects | 0 |
| Ssl_connect_renegotiates | 0 |
| Ssl_ctx_verify_depth | 0 |
| Ssl_ctx_verify_mode | 0 |
| Ssl_default_timeout | 0 |
| Ssl_finished_accepts | 0 |
| Ssl_finished_connects | 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_sessions_reused | 0 |
| Ssl_used_session_cache_entries | 0 |
| Ssl_verify_depth | 0 |
| Ssl_verify_mode | 0 |
| Ssl_version | |
| Table_locks_immediate | 56855 |
| Table_locks_waited | 0 |
| Tc_log_max_pages_used | 0 |
| Tc_log_page_size | 0 |
| Tc_log_page_waits | 0 |
| Threads_cached | 8 | Thread CacheÀÇ Thread ¼ö
| Threads_connected | 1 | ÇöÀç ¿¬°áµÈ Thread ¼ö
| Threads_created | 359 | Á¢¼ÓÀ» À§ÇØ »ý¼ºµÈ Thread ¼ö
| Threads_running | 1 | Sleeping µÇ¾î ÀÖÁö ¾ÊÀº Thread ¼ö
| Uptime | 4188 |
| Uptime_since_flush_status | 4188 |
+------------------------------------------+-------------+
mysql> show variables like '%max_connection%';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 151 |
+-----------------+-------+
mysql> show variables like '%wait_timeout%';
+--------------------------+----------+
| Variable_name | Value |
+--------------------------+----------+
| innodb_lock_wait_timeout | 50 | Á¾·áÀü±îÁö ¿äûÀÌ ¾øÀÌ ±â´Ù¸®´Â ½Ã°£ ( TCP/IP ¿¬°á, Shell »óÀÇ Á¢¼ÓÀÌ ¾Æ´Ñ °æ¿ì )
| lock_wait_timeout | 31536000 |
| wait_timeout | 28800 |
+--------------------------+----------+
mysql> show variables like '%thread%';
+-----------------------------------------+---------------------------+
| Variable_name | Value |
+-----------------------------------------+---------------------------+
| innodb_purge_threads | 0 |
| innodb_read_io_threads | 4 |
| innodb_thread_concurrency | 0 |
| innodb_thread_sleep_delay | 10000 |
| innodb_write_io_threads | 4 |
| max_delayed_threads | 20 |
| max_insert_delayed_threads | 20 |
| myisam_repair_threads | 1 |
| performance_schema_max_thread_classes | 50 |
| performance_schema_max_thread_instances | 1000 |
| pseudo_thread_id | 33865 |
| thread_cache_size | 8 | thread Àç »ç¿ëÀ» À§ÇÑ Thread Cache ¼ö·Î½á, Cache ¿¡ ÀÖ´Â Thread ¼öº¸´Ù Á¢¼ÓÀÌ ¸¹À¸¸é »õ·Ó°Ô Thread¸¦ »ý¼ºÇÑ´Ù.
| thread_concurrency | 16 |
| thread_handling | one-thread-per-connection |
| thread_stack | 262144 |
+-----------------------------------------+---------------------------+
mysql> show variables like '%max_connections%';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 151 | ÃÖ´ë µ¿½Ã Á¢¼Ó °¡´É ¼ö
+-----------------+-------+
Cache Miss Rate(%) = Threads_created / Connections * 100
mysql> show status like '%thread%';
mysql> show status like '%connect%';
1.08% = 753 / 69671 * 100
1.1% = 11 / 962 * 100
Connection Miss Rate(%) = Aborted_connects / Connections * 100
mysql> show status like '%connect%';
0.02% = 14 / 69671 * 100
Connection Usage(%) = Threads_connected / max_connections * 100
mysql> show status like '%thread%';
mysql> show variables like '%connect%';
7.28% = 11 / 151 * 100
2% = 4 / 200 * 100
. Æ©´×
Connection Usage(%)°¡ 100% ¶ó¸é max_connections ¼ö¸¦ Áõ°¡½ÃÄÑ Áֽʽÿä. Connection ¼ö°¡ ºÎÁ·ÇÒ °æ¿ì Too Many Connection Error °¡ ¹ß»ýÇÕ´Ï´Ù.
DB ¼¹öÀÇ Á¢¼ÓÀÌ ¸¹Àº °æ¿ì´Â wait_timeout À» ÃÖ´ëÇÑ Àû°Ô (10~20 Á¤µµ¸¦ Ãßõ) ¼³Á¤ÇÏ¿© ºÒÇÊ¿äÇÑ ¿¬°áÀ» »¡¸® Á¤¸®ÇÏ´Â °ÍÀÌ ÁÁ½À´Ï´Ù.
±×·¯³ª Connection Miss Rate(%) °¡ 1% ÀÌ»óÀÌ µÈ´Ù¸é wait_timeout À» Á» ´õ ±æ°Ô Àâ´Â °ÍÀÌ ÁÁ½À´Ï´Ù.
Cache Miss Rate(%) °¡ ³ô´Ù¸é thread_cache_size¸¦ ±âº»°ªÀÎ 8 º¸´Ù ³ô°Ô ¼³Á¤ÇÏ´Â °ÍÀÌ ÁÁ½À´Ï´Ù. ÀϹÝÀûÀ¸·Î threads_connected °¡ Peak-time ½Ã º¸´Ù ¾à°£ ³·Àº ¼öÄ¡·Î ¼³Á¤ÇÏ´Â °ÍÀÌ ÁÁ½À´Ï´Ù.
MySQL ¼¹ö´Â ¿ÜºÎ·Î ºÎÅÍ Á¢¼Ó ¿äûÀ» ¹ÞÀ» °æ¿ì ÀÎÁõÀ» À§ÇØ IP ÁÖ¼Ò¸¦ È£½ºÆ®³×ÀÓÀ¸·Î ¹Ù²Ù´Â °úÁ¤À» ¼öÇàÇÏ¿© Á¢¼Ó½Ã¿¡ ºÒÇÊ¿äÇÑ ºÎÇÏ°¡ ¹ß»ýÇÏ°Ô µË´Ï´Ù.
skip-name-resolve¸¦ ¼³Á¤ÇϽðí Á¢¼Ó½Ã¿¡ IP ±â¹ÝÀ¸·Î Á¢¼ÓÀ» ÇÏ°Ô µÇ¸é hostname lookup °úÁ¤À» »ý·«ÇÏ°Ô µÇ¾î Á» ´õ ºü¸£°Ô Á¢¼ÓÀ» ÇÏ½Ç ¼ö ÀÖ½À´Ï´Ù.
. Memory Æ©´×
mysql> show status like '%key%';
+------------------------+---------+
| Variable_name | Value |
+------------------------+---------+
| Com_assign_to_keycache | 0 |
| Com_preload_keys | 0 |
| Com_show_keys | 0 |
| Handler_read_key | 0 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 307043 | Key Cache¿¡¼ »ç¿ëµÇ°í ÀÖÁö ¾ÊÀº Block ¼ö
| Key_blocks_used | 12864 |
| Key_read_requests | 1305206 | Key Block Àб⠿äû¼ö
| Key_reads | 198507 | Key Block Àб⠿äû½Ã DiskÀ» ÀÐÀº ¼ö
| Key_write_requests | 55 |
| Key_writes | 55 |
+------------------------+---------+
1. status
key_block_unused - Key Cache¿¡¼ »ç¿ëµÇ°í ÀÖÁö ¾ÊÀº Block ¼ö
key_reads - Key Block Àб⠿äû½Ã DiskÀ» ÀÐÀº ¼ö
key_read_requests - Key Block Àб⠿äû¼ö
mysql> show variables like '%key%';
+--------------------------+----------------------+
| Variable_name | Value |
+--------------------------+----------------------+
| delay_key_write | ON |
| foreign_key_checks | ON |
| have_rtree_keys | YES |
| key_buffer_size | 402653184 | À妽º¸¦ ¸Þ¸ð¸®¿¡ ÀúÀåÇÏ´Â ¹öÆÛÀÇ Å©±â
| key_cache_age_threshold | 300 |
| key_cache_block_size | 1024 |
| key_cache_division_limit | 100 |
| max_seeks_for_key | 18446744073709551615 |
| ssl_key | |
+--------------------------+----------------------+
2. system variables
key_buffer_size - À妽º¸¦ ¸Þ¸ð¸®¿¡ ÀúÀåÇÏ´Â ¹öÆÛÀÇ Å©±â
table_cache - Àüü ¾²·¹µå°¡ »ç¿ëÇÒ ¿ÀÇ °¡´ÉÇÑ Å×ÀÌºí ¼ö
myisam_sort_buffer_size - Å×À̺í repair,Alter table,load data¿¡ »ç¿ëµÇ´Â ¹öÆÛ ¸Þ¸ð¸® Å©±â
join_buffer_size - Á¶ÀÎÀ» À§ÇÑ ¸Þ¸ð¸® ¹öÆÛ Å©±â
record_buffer - ¼øÂ÷ÀûÀÎ °Ë»öÀ» À§ÇØ »ç¿ëµÇ´Â ¸Þ¸ð¸® ¹öÆÛ Å©±â
record_rnd_buffer - order by ÀýÀ» »ç¿ëÇÒ °æ¿ì µð½ºÅ© »ç¿ëÀ» ÇÇÇϱâ À§ÇÏ¿© »ç¿ëÇÏ´Â ¸Þ¸ð¸® ¹öÆÛ Å©±â
sort_buffer - order by ¿Í group by¿¡ »ç¿ëµÇ´Â ¸Þ¸ð¸® ¹öÆÛ Å©±â
tmp_table_size - group by ½Ã µð½ºÅ©¸¦ »ç¿ëÇÏÁö ¾Ê°í Àӽà Å×À̺íÀ» ¸¸µé±â À§ÇØ »ç¿ëµÇ´Â ¸Þ¸ð¸® Å©±â
key_cache_block_size - block ÀÇ Å©±â(bytes, ±âº»°ª 1024)
Key Buffer Usage = 1 - ((Key_blocks_unused ¡¿ key_cache_block_size) / key_buffer_size)
mysql> show status like '%key%';
mysql> show variables like '%key%';
0.211 = 1 - ((307095 * 1024) / 402653184)
0.189 = 1 - ((850422 * 1024) / 1073741824)
Key_reads/Key_read_requests Rate(%) = Key_reads/Key_read_requests * 100
mysql> show status like '%key%';
15% = 207265/1374958 * 100
17% = 9709 / 54200 * 100
2699 / 12898 * 100
Key_reads/Key_read_requests Relative Rate(%) = (1- ^Key_reads/^Key_read_requests) * 100
* ^Key_Reads = Current Key_Rreads - Previous Key_Reads
= 1 - 8455/
3. Æ©´×
key_buffer_size´Â ÃÑ ¸Þ¸ð¸® Å©±âÀÇ 25% Á¤µµÀÇ Å©±â·Î ¼³Á¤ÇÏ´Â °ÍÀÌ ÁÁ½À´Ï´Ù.
Key_reads/Key_read_requests Rate(%)Àº ÀϹÝÀûÀ¸·Î 1%º¸´Ù Àû½À´Ï´Ù.
1% º¸´Ù ³ô´Ù¸é Key Cache°¡ ¾Æ´Ñ µð½ºÅ©¸¦ ÀÐÀº °æ¿ì°¡ ¸¹´Ù°í ÆÇ´ÜÇÒ ¼ö ÀÖ½À´Ï´Ù.
¶ÇÇÑ Key_reads/Key_reads_requests Relative Rate(%) °ªÀÌ Áö¼ÓÀûÀ¸·Î 90% ÀÌ»óÀÏ °æ¿ì´Â key_buffer_size°¡ È¿À²ÀûÀ¸·Î ¼³Á¤µÇ¾î ÀÖ´Ù°í »ý°¢ÇÏ½Ã¸é µË´Ï´Ù.
ÇÏÁö¸¸ µ¥ÀÌÅͺ£À̽º°¡ ¾öû³ª°Ô Å©°Å³ª ¿©·¯ µ¥ÀÌÅ͸¦ °ñ°í·ç ¸¹ÀÌ Àд µ¥ÀÌÅͺ£À̽º¶ó¸é ¾Æ¹«¸® ¸¹Àº ¾çÀÇ Å° ij½Ã¸¦ ¼³Á¤Çصµ 90% ÀÌ»óÀÇ ÀûÁß·üÀ» ¾òÀ» ¼ö´Â ¾ø½À´Ï´Ù.
.Àû¿ë
[www@smson www]$ vi /etc/my.cnf
# The MySQL server
[mysqld]
skip-name-resolve
key_buffer_size = 1024M
max_allowed_packet = 1M
table_open_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache = 8
query_cache_size= 16M
wait_timeout = 120
Âü°í: mysql Æ©´× Åø
wget http://mysqltuner.com/mysqltuner.pl
chmod +x ./mysqltuner.pl
./mysqltuner.pl
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