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Mysql high load
mamylo




msg:4101716
 11:52 pm on Mar 20, 2010 (gmt 0)

Hello guys
I have a website with about 200 online users and 100 guests. I think my mysql settings are incorrect, because when I use top in ssh, I see the mysqld process using > 200% of cpu usage, and the site is very slow and any page is taking more than 2 minutes to load. Can you help me please?

My my.cnf file:

[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer_size = 128M
max_allowed_packet = 1M
max_connections=2000
thread_cache_size=2000
query_cache_size=4096
table_cache = 4
sort_buffer_size = 4M
read_buffer_size = 1M
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 256K
skip-bdb
skip-innodb
log-slow-queries = /var/log/mysql-slow.log

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
#safe-updates

[isamchk]
key_buffer = 8M
sort_buffer_size = 8M

[myisamchk]
key_buffer = 8M
sort_buffer_size = 10M

[mysqlhotcopy]
interactive-timeout


Show status:

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| Com_xa_end | 0 |
| Com_xa_prepare | 0 |
| Com_xa_recover | 0 |
| Com_xa_rollback | 0 |
| Com_xa_start | 0 |
| Compression | OFF |
| Connections | 417 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 0 |
| Created_tmp_tables | 2 |
| 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 | 11 |
| Handler_rollback | 0 |
| Handler_savepoint | 0 |
| Handler_savepoint_rollback | 0 |
| Handler_update | 0 |
| Handler_write | 142 |
| Innodb_buffer_pool_pages_data | 0 |
| Innodb_buffer_pool_pages_dirty | 0 |
| Innodb_buffer_pool_pages_flushed | 0 |
| Innodb_buffer_pool_pages_free | 0 |
| Innodb_buffer_pool_pages_misc | 0 |
| Innodb_buffer_pool_pages_total | 0 |
| Innodb_buffer_pool_read_ahead_rnd | 0 |
| Innodb_buffer_pool_read_ahead_seq | 0 |
| Innodb_buffer_pool_read_requests | 0 |
| Innodb_buffer_pool_reads | 0 |
| Innodb_buffer_pool_wait_free | 0 |
| Innodb_buffer_pool_write_requests | 0 |
| Innodb_data_fsyncs | 0 |
| Innodb_data_pending_fsyncs | 0 |
| Innodb_data_pending_reads | 0 |
| Innodb_data_pending_writes | 0 |
| Innodb_data_read | 0 |
| Innodb_data_reads | 0 |
| Innodb_data_writes | 0 |
| Innodb_data_written | 0 |
| Innodb_dblwr_pages_written | 0 |
| Innodb_dblwr_writes | 0 |
| Innodb_log_waits | 0 |
| Innodb_log_write_requests | 0 |
| Innodb_log_writes | 0 |
| Innodb_os_log_fsyncs | 0 |
| Innodb_os_log_pending_fsyncs | 0 |
| Innodb_os_log_pending_writes | 0 |
| Innodb_os_log_written | 0 |
| Innodb_page_size | 0 |
| Innodb_pages_created | 0 |
| Innodb_pages_read | 0 |
| 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 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 115563 |
| Key_blocks_used | 724 |
| Key_read_requests | 229851 |
| Key_reads | 3857 |
| Key_write_requests | 202 |
| Key_writes | 189 |
| Last_query_cost | 0.000000 |
| Max_used_connections | 158 |
| Not_flushed_delayed_rows | 0 |
| Open_files | 161 |
| Open_streams | 0 |
| Open_tables | 151 |
| Opened_tables | 0 |
| Prepared_stmt_count | 0 |
| Qcache_free_blocks | 0 |
| Qcache_free_memory | 0 |
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| Qcache_inserts | 0 |
| Qcache_lowmem_prunes | 0 |
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| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 0 |
| Queries | 6916 |
| Questions | 3 |
| Rpl_status | NULL |
| Select_full_join | 0 |
| Select_full_range_join | 0 |
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| Select_range_check | 0 |
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| 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 | 6488 |
| Table_locks_waited | 1284 |
| Tc_log_max_pages_used | 0 |
| Tc_log_page_size | 0 |
| Tc_log_page_waits | 0 |
| Threads_cached | 1 |
| Threads_connected | 157 |
| Threads_created | 158 |
| Threads_running | 81 |
| Uptime | 396 |
| Uptime_since_flush_status | 6916 |


I'm using MySQL + Lighttpd

 

whoisgregg




msg:4102419
 5:02 pm on Mar 22, 2010 (gmt 0)

Welcome to WebmasterWorld, mamylo!

Have you checked this file: /var/log/mysql-slow.log to see which queries are at fault? (If any?) It may simply be a matter of adding proper indices or tuning your queries.

Are you using a particular piece of software on this server (like a forum or blog)?

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