Centos 6.5
我正在为Roundcube webmail调整我的MySQL InnoDB服务器。这是我目前的my.conf：
[mysqld]
local-infile=0
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
innodb_buffer_pool_size=10240M
innodb_additional_mem_pool_size=1024M
innodb_log_buffer_size=64M
innodb_thread_concurrency=12
slow_query_log=1
slow_query_log_file=mysql-slow.log
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
innodb_buffer_pool_size=2M
innodb_additional_mem_pool_size=500K
innodb_log_buffer_size=500K
innodb_thread_concurrency=2
我登录了mysql并运行了显示状态，例如＆＃39;％onn％＆＃39 ;;它又回来了：
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| Aborted_connects | 2 |
| Connections | 2762 |
| Max_used_connections | 7 |
| Ssl_client_connects | 0 |
| Ssl_connect_renegotiates | 0 |
| Ssl_finished_connects | 0 |
| Threads_connected | 3 |
+--------------------------+-------+
7 rows in set (0.00 sec)
我听到来自我的Roundcube网络邮件用户的性能缓慢，并且想知道为什么我的连接是2762并且在我没有设置max_connections时不断增长。这样：
问题1：为什么我的关系会不断增长，这样可以吗？这是我检查的方式：
mysql> select @@max_connections;
+-------------------+
| @@max_connections |
+-------------------+
| 151 |
+-------------------+
1 row in set (0.00 sec)
mysql> show processlist;
+------+-------+-----------+------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+------+-------+-----------+------+---------+------+-------+------------------+
| 2296 | admin | localhost | NULL | Query | 0 | NULL | show processlist |
| 3221 | admin | localhost | psa | Sleep | 55 | | NULL |
| 3222 | admin | localhost | psa | Sleep | 55 | | NULL |
+------+-------+-----------+------+---------+------+-------+------------------+
3 rows in set (0.00 sec)
问题2：我是否应该设置一些其他参数来为mysql和innodb提供更多的性能资源？将buffer_pool_size增加到10GB非常有帮助，我想知道我是否错过了其他内容？
这是我的innodb引擎状态：
--------------------------------------------------+
| InnoDB | |
=====================================
141001 13:09:27 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 6 seconds
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 197, signal count 196
Mutex spin waits 0, rounds 530, OS waits 22
RW-shared spins 302, OS waits 151; RW-excl spins 27, OS waits 24
------------
TRANSACTIONS
------------
Trx id counter 0 11948976
Purge done for trx's n:o < 0 11948923 undo n:o < 0 0
History list length 15
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0 0, not started, process no 26701, OS thread id 140085282813696
MySQL thread id 2296, query id 14827 localhost admin
SHOW ENGINE INNODB STATUS
---TRANSACTION 0 11948975, not started, process no 26701, OS thread id 140085281482496
MySQL thread id 3158, query id 14826 localhost roundcube
---TRANSACTION 0 11945958, not started, process no 26701, OS thread id 140085282547456
MySQL thread id 2127, query id 10139 localhost admin
---TRANSACTION 0 11945954, not started, process no 26701, OS thread id 140085282281216
MySQL thread id 2126, query id 10133 localhost admin
--------
FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (write thread)
Pending normal aio reads: 0, aio writes: 0,
ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
329 OS file reads, 4416 OS file writes, 2123 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.67 writes/s, 0.67 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2,
0 inserts, 0 merged recs, 0 merges
Hash table size 21249871, node heap has 5 buffer(s)
2.00 hash searches/s, 2.83 non-hash searches/s
---
LOG
---
Log sequence number 0 3617058835
Log flushed up to 0 3617058835
Last checkpoint at 0 3617011323
0 pending log writes, 0 pending chkp writes
1546 log i/o's done, 0.67 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 11836708088; in additional pool allocated 12304384
Dictionary memory allocated 376320
Buffer pool size 655360
Free buffers 654975
Database pages 380
Modified db pages 11
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages read 367, created 13, written 2930
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Main thread process no. 26701, id 140073650968320, state: sleeping
Number of rows inserted 71, updated 1126, deleted 67, read 41194
0.00 inserts/s, 0.67 updates/s, 0.00 deletes/s, 3.50 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
|
我的状态：
mysql> show status;
+-----------------------------------+-----------+
| Variable_name | Value |
+-----------------------------------+-----------+
| Aborted_clients | 0 |
| Aborted_connects | 2 |
| Binlog_cache_disk_use | 0 |
| Binlog_cache_use | 0 |
| Bytes_received | 572 |
| Bytes_sent | 6217 |
| 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_backup_table | 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_load_master_data | 0 |
| Com_load_master_table | 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_restore_table | 0 |
| Com_revoke | 0 |
| Com_revoke_all | 0 |
| Com_rollback | 0 |
| Com_rollback_to_savepoint | 0 |
| Com_savepoint | 0 |
| Com_select | 3 |
| Com_set_option | 0 |
| Com_show_authors | 0 |
| Com_show_binlog_events | 0 |
| Com_show_binlogs | 0 |
| Com_show_charsets | 0 |
| Com_show_collations | 0 |
| Com_show_column_types | 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 | 1 |
| 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_new_master | 0 |
| Com_show_open_tables | 0 |
| Com_show_plugins | 0 |
| Com_show_privileges | 0 |
| Com_show_procedure_status | 0 |
| Com_show_processlist | 1 |
| Com_show_profile | 0 |
| Com_show_profiles | 0 |
| Com_show_slave_hosts | 0 |
| Com_show_slave_status | 0 |
| Com_show_status | 6 |
| 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 | 3514 |
| 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_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 | 380 |
| Innodb_buffer_pool_pages_dirty | 4 |
| Innodb_buffer_pool_pages_flushed | 3334 |
| Innodb_buffer_pool_pages_free | 654974 |
| Innodb_buffer_pool_pages_misc | 6 |
| Innodb_buffer_pool_pages_total | 655360 |
| Innodb_buffer_pool_read_ahead_rnd | 1 |
| Innodb_buffer_pool_read_ahead_seq | 0 |
| Innodb_buffer_pool_read_requests | 87189 |
| Innodb_buffer_pool_reads | 316 |
| Innodb_buffer_pool_wait_free | 0 |
| Innodb_buffer_pool_write_requests | 16018 |
| Innodb_data_fsyncs | 2366 |
| Innodb_data_pending_fsyncs | 0 |
| Innodb_data_pending_reads | 0 |
| Innodb_data_pending_writes | 0 |
| Innodb_data_read | 8196096 |
| Innodb_data_reads | 329 |
| Innodb_data_writes | 4983 |
| Innodb_data_written | 118115840 |
| Innodb_dblwr_pages_written | 3334 |
| Innodb_dblwr_writes | 329 |
| Innodb_log_waits | 0 |
| Innodb_log_write_requests | 18114 |
| Innodb_log_writes | 1542 |
| Innodb_os_log_fsyncs | 1713 |
| Innodb_os_log_pending_fsyncs | 0 |
| Innodb_os_log_pending_writes | 0 |
| Innodb_os_log_written | 8781312 |
| Innodb_page_size | 16384 |
| Innodb_pages_created | 13 |
| Innodb_pages_read | 367 |
| Innodb_pages_written | 3334 |
| 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 | 1 |
| Innodb_rows_deleted | 75 |
| Innodb_rows_inserted | 75 |
| Innodb_rows_read | 42750 |
| Innodb_rows_updated | 1252 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 6693 |
| Key_blocks_used | 8 |
| Key_read_requests | 2034 |
| Key_reads | 4 |
| Key_write_requests | 702 |
| Key_writes | 0 |
| Last_query_cost | 0.000000 |
| Max_used_connections | 7 |
| Not_flushed_delayed_rows | 0 |
| Open_files | 7 |
| Open_streams | 0 |
| Open_table_definitions | 71 |
| Open_tables | 64 |
| Opened_files | 808 |
| Opened_table_definitions | 0 |
| Opened_tables | 0 |
| Prepared_stmt_count | 0 |
| Qcache_free_blocks | 0 |
| Qcache_free_memory | 0 |
| Qcache_hits | 0 |
| Qcache_inserts | 0 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 0 |
| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 0 |
| Queries | 16423 |
| Questions | 15 |
| Rpl_status | NULL |
| Select_full_join | 0 |
| Select_full_range_join | 0 |
| Select_range | 0 |
| Select_range_check | 0 |
| Select_scan | 0 |
| Slave_open_temp_tables | 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 | 9200 |
| Table_locks_waited | 0 |
| Tc_log_max_pages_used | 0 |
| Tc_log_page_size | 0 |
| Tc_log_page_waits | 0 |
| Threads_cached | 0 |
| Threads_connected | 4 |
| Threads_created | 3513 |
| Threads_running | 1 |
| Uptime | 1818 |
| Uptime_since_flush_status | 1818 |
+-----------------------------------+-----------+
291 rows in set (0.00 sec)
答案 0 :(得分：0)
每次7'max_used_connections'中的一个使用系统访问其数据时，您的状态'连接'将递增。
max_user_connections可以被认为是启动后一个时刻并发/同时用户数的高水位标记。