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  • Please help to optimize mysql

    Hi, i need help to optimize better mysql. We have run on CentOs 5 2.6.18-53.1.19.el5. Mysql 5 and apache 2.2.8. But we are getting high load when server is accessing harder from visitors. I think that we have some memory bottleneck and this is the reason to want to optimize better mysql, because i suppose that it might be one of the reasons for this. Also i see that mysql sometimes is using more cpu, i would like to reduce it. We use Innodb and we have more that 1 million records in our database.

    The system is we 4GB RAM, Intel Core Duo

    This is mysql configuration right now.


    [mysqld]datadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sock# Default to using old password format for compatibility with mysql 3.x# clients (those using the mysqlclient10 compatibility package).old_passwords=0bind-address=127.0.0.1max_connections=300# Set MyISAM parameterskey_buffer_size=3Mtmp_table_size=16M# Set InnoDB parametersinnodb_file_per_table# Set buffer pool size to 50 - 80% of availiable memory.innodb_buffer_pool_size=500Minnodb_addition al_mem_pool_size=30M#innodb_flush_method=O_DIRECT# Set the log file size to about 25% of the buffer pool size.#innodb_log_file_size=5M#innodb_log_buffer_si ze=1Mtable_cache=1024#sort_buffer_size=3Mquery_cac he_type=1query_cache_limit=1Mquery_cache_size=70Mn et_read_timeout=120#long_query_time=10#log_warning s=2#log_slow_queries=/var/log/mysql/slow-queries.logcollation_server=utf8_unicode_cicharact er_set_server=utf8[mysql]default-character-set=utf8[mysqldump]default-character-set=utf8[mysql.server]user=mysqlbasedir=/var/lib[mysqld_safe]log-error=/var/log/mysqld.logpid-file=/var/run/mysqld/mysqld.pid


    This is output from show status:


    mysql> show status;+-----------------------------------+------------+| Variable_name | Value |+-----------------------------------+------------+| Aborted_clients | 148 | | Aborted_connects | 4 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 0 | | Bytes_received | 79 | | Bytes_sent | 67 | | Com_admin_commands | 0 | | Com_alter_db | 0 | | Com_alter_table | 0 | | Com_analyze | 0 | | Com_backup_table | 0 | | Com_begin | 0 | | Com_change_db | 0 | | Com_change_master | 0 | | Com_check | 0 | | Com_checksum | 0 | | Com_commit | 0 | | Com_create_db | 0 | | Com_create_function | 0 | | Com_create_index | 0 | | Com_create_table | 0 | | Com_dealloc_sql | 0 | | Com_delete | 0 | | Com_delete_multi | 0 | | Com_do | 0 | | Com_drop_db | 0 | | Com_drop_function | 0 | | Com_drop_index | 0 | | Com_drop_table | 0 | | Com_drop_user | 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_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_rename_table | 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_savepoint | 0 | | Com_select | 0 | | Com_set_option | 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_create_db | 0 | | Com_show_create_table | 0 | | Com_show_databases | 0 | | Com_show_errors | 0 | | Com_show_fields | 0 | | Com_show_grants | 0 | | Com_show_innodb_status | 0 | | Com_show_keys | 0 | | Com_show_logs | 0 | | Com_show_master_status | 0 | | Com_show_ndb_status | 0 | | Com_show_new_master | 0 | | Com_show_open_tables | 0 | | Com_show_privileges | 0 | | Com_show_processlist | 0 | | Com_show_slave_hosts | 0 | | Com_show_slave_status | 0 | | Com_show_status | 1 | | Com_show_storage_engines | 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_reset | 0 | | Com_stmt_send_long_data | 0 | | Com_truncate | 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 | 139 | | Created_tmp_disk_tables | 0 | | Created_tmp_files | 5 | | Created_tmp_tables | 1 | | 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 | 130 | | Innodb_buffer_pool_pages_data | 30962 | | Innodb_buffer_pool_pages_dirty | 4 | | Innodb_buffer_pool_pages_flushed | 9439 | | Innodb_buffer_pool_pages_free | 0 | | Innodb_buffer_pool_pages_latched | 0 | | Innodb_buffer_pool_pages_misc | 1038 | | Innodb_buffer_pool_pages_total | 32000 | | Innodb_buffer_pool_read_ahead_rnd | 704 | | Innodb_buffer_pool_read_ahead_seq | 223 | | Innodb_buffer_pool_read_requests | 59240240 | | Innodb_buffer_pool_reads | 35301 | | Innodb_buffer_pool_wait_free | 0 | | Innodb_buffer_pool_write_requests | 37073 | | Innodb_data_fsyncs | 4789 | | Innodb_data_pending_fsyncs | 0 | | Innodb_data_pending_reads | 0 | | Innodb_data_pending_writes | 0 | | Innodb_data_read | 1017548800 | | Innodb_data_reads | 44144 | | Innodb_data_writes | 11748 | | Innodb_data_written | 315497984 | | Innodb_dblwr_pages_written | 9439 | | Innodb_dblwr_writes | 578 | | Innodb_log_waits | 0 | | Innodb_log_write_requests | 13597 | | Innodb_log_writes | 2658 | | Innodb_os_log_fsyncs | 3081 | | Innodb_os_log_pending_fsyncs | 0 | | Innodb_os_log_pending_writes | 0 | | Innodb_os_log_written | 5985280 | | Innodb_page_size | 16384 | | Innodb_pages_created | 118 | | Innodb_pages_read | 61973 | | Innodb_pages_written | 9439 | | 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 | 1590 | | Innodb_rows_inserted | 1720 | | Innodb_rows_read | 17506842 | | Innodb_rows_updated | 398 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 2508 | | Key_blocks_used | 96 | | Key_read_requests | 503599 | | Key_reads | 5339 | | Key_write_requests | 151136 | | Key_writes | 0 | | Last_query_cost | 0.000000 | | Max_used_connections | 32 | | Not_flushed_delayed_rows | 0 | | Open_files | 78 | | Open_streams | 0 | | Open_tables | 195 | | Opened_tables | 0 | | Qcache_free_blocks | 460 | | Qcache_free_memory | 27848048 | | Qcache_hits | 795817 | | Qcache_inserts | 34280 | | Qcache_lowmem_prunes | 11739 | | Qcache_not_cached | 1697 | | Qcache_queries_in_cache | 1124 | | Qcache_total_blocks | 2756 | | Questions | 839206 | | Rpl_status | NULL | | Select_full_join | 0 | | Select_full_range_join | 0 | | Select_range | 0 | | Select_range_check | 0 | | Select_scan | 1 | | 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 | 112376 | | 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 | 26 | | Threads_created | 138 | | Threads_running | 1 | | Uptime | 4344 | +-----------------------------------+------------+245 rows in set (0.00 sec)


    this is the output from show variables;


    mysql> show variables;+---------------------------------+--------------------------------------------------------+| Variable_name | Value |+---------------------------------+--------------------------------------------------------+| auto_increment_increment | 1 | | auto_increment_offset | 1 | | automatic_sp_privileges | ON | | back_log | 50 | | basedir | /usr/ | | bdb_cache_size | 8388600 | | bdb_home | /var/lib/mysql/ | | bdb_log_buffer_size | 524288 | | bdb_logdir | | | bdb_max_lock | 10000 | | bdb_shared_data | OFF | | bdb_tmpdir | /tmp/ | | binlog_cache_size | 32768 | | bulk_insert_buffer_size | 8388608 | | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | | collation_connection | utf8_general_ci | | collation_database | utf8_general_ci | | collation_server | utf8_general_ci | | completion_type | 0 | | concurrent_insert | 1 | | connect_timeout | 5 | | datadir | /var/lib/mysql/ | | date_format | %Y-%m-%d | | datetime_format | %Y-%m-%d %H:%i:%s | | default_week_format | 0 | | delay_key_write | ON | | delayed_insert_limit | 100 | | delayed_insert_timeout | 300 | | delayed_queue_size | 1000 | | div_precision_increment | 4 | | engine_condition_pushdown | OFF | | expire_logs_days | 0 | | flush | OFF | | flush_time | 0 | | ft_boolean_syntax | + -><()~*:""&| | | ft_max_word_len | 84 | | ft_min_word_len | 4 | | ft_query_expansion_limit | 20 | | ft_stopword_file | (built-in) | | group_concat_max_len | 1024 | | have_archive | NO | | have_bdb | YES | | have_blackhole_engine | NO | | have_compress | YES | | have_crypt | YES | | have_csv | NO | | have_example_engine | NO | | have_federated_engine | NO | | have_geometry | YES | | have_innodb | YES | | have_isam | NO | | have_ndbcluster | NO | | have_openssl | DISABLED | | have_query_cache | YES | | have_raid | NO | | have_rtree_keys | YES | | have_symlink | YES | | init_connect | | | init_file | | | init_slave | | | innodb_additional_mem_pool_size | 52428800 | | innodb_autoextend_increment | 8 | | innodb_buffer_pool_awe_mem_mb | 0 | | innodb_buffer_pool_size | 524288000 | | innodb_checksums | ON | | innodb_commit_concurrency | 0 | | innodb_concurrency_tickets | 500 | | innodb_data_file_path | ibdata1:10M:autoextend | | innodb_data_home_dir | | | innodb_doublewrite | ON | | innodb_fast_shutdown | 1 | | innodb_file_io_threads | 4 | | innodb_file_per_table | ON | | innodb_flush_log_at_trx_commit | 1 | | innodb_flush_method | | | innodb_force_recovery | 0 | | innodb_lock_wait_timeout | 50 | | innodb_locks_unsafe_for_binlog | OFF | | innodb_log_arch_dir | | | innodb_log_archive | OFF | | innodb_log_buffer_size | 1048576 | | innodb_log_file_size | 5242880 | | innodb_log_files_in_group | 2 | | innodb_log_group_home_dir | ./ | | innodb_max_dirty_pages_pct | 90 | | innodb_max_purge_lag | 0 | | innodb_mirrored_log_groups | 1 | | innodb_open_files | 300 | | innodb_support_xa | ON | | innodb_sync_spin_loops | 20 | | innodb_table_locks | ON | | innodb_thread_concurrency | 8 | | innodb_thread_sleep_delay | 10000 | | interactive_timeout | 28800 | | join_buffer_size | 131072 | | key_buffer_size | 3145728 | | key_cache_age_threshold | 300 | | key_cache_block_size | 1024 | | key_cache_division_limit | 100 | | language | /usr/share/mysql/english/ | | large_files_support | ON | | large_page_size | 0 | | large_pages | OFF | | license | GPL | | local_infile | ON | | locked_in_memory | OFF | | log | OFF | | log_bin | OFF | | log_bin_trust_function_creators | OFF | | log_error | | | log_slave_updates | OFF | | log_slow_queries | OFF | | log_warnings | 1 | | long_query_time | 10 | | low_priority_updates | OFF | | lower_case_file_system | OFF | | lower_case_table_names | 0 | | max_allowed_packet | 1048576 | | max_binlog_cache_size | 18446744073709551615 | | max_binlog_size | 1073741824 | | max_connect_errors | 10 | | max_connections | 300 | | max_delayed_threads | 20 | | max_error_count | 64 | | max_heap_table_size | 16777216 | | max_insert_delayed_threads | 20 | | max_join_size | 18446744073709551615 | | max_length_for_sort_data | 1024 | | max_prepared_stmt_count | 16382 | | max_relay_log_size | 0 | | max_seeks_for_key | 18446744073709551615 | | max_sort_length | 1024 | | max_sp_recursion_depth | 0 | | max_tmp_tables | 32 | | max_user_connections | 0 | | max_write_lock_count | 18446744073709551615 | | multi_range_count | 256 | | myisam_data_pointer_size | 6 | | myisam_max_sort_file_size | 9223372036854775807 | | myisam_recover_options | OFF | | myisam_repair_threads | 1 | | myisam_sort_buffer_size | 8388608 | | myisam_stats_method | nulls_unequal | | net_buffer_length | 16384 | | net_read_timeout | 120 | | net_retry_count | 10 | | net_write_timeout | 60 | | new | OFF | | old_passwords | OFF | | open_files_limit | 2358 | | optimizer_prune_level | 1 | | optimizer_search_depth | 62 | | pid_file | /var/run/mysqld/mysqld.pid | | prepared_stmt_count | 0 | | port | 3306 | | preload_buffer_size | 32768 | | protocol_version | 10 | | query_alloc_block_size | 8192 | | query_cache_limit | 1048576 | | query_cache_min_res_unit | 4096 | | query_cache_size | 31457280 | | query_cache_type | ON | | query_cache_wlock_invalidate | OFF | | query_prealloc_size | 8192 | | range_alloc_block_size | 2048 | | read_buffer_size | 131072 | | read_only | OFF | | read_rnd_buffer_size | 262144 | | relay_log_purge | ON | | relay_log_space_limit | 0 | | rpl_recovery_rank | 0 | | secure_auth | OFF | | server_id | 0 | | skip_external_locking | ON | | skip_networking | OFF | | skip_show_database | OFF | | slave_compressed_protocol | OFF | | slave_load_tmpdir | /tmp/ | | slave_net_timeout | 3600 | | slave_skip_errors | OFF | | slave_transaction_retries | 10 | | slow_launch_time | 2 | | socket | /var/lib/mysql/mysql.sock | | sort_buffer_size | 2097144 | | sql_mode | | | sql_notes | ON | | sql_warnings | ON | | storage_engine | MyISAM | | sync_binlog | 0 | | sync_frm | ON | | system_time_zone | CEST | | table_cache | 1024 | | table_lock_wait_timeout | 50 | | table_type | MyISAM | | thread_cache_size | 0 | | thread_stack | 262144 | | time_format | %H:%i:%s | | time_zone | SYSTEM | | timed_mutexes | OFF | | tmp_table_size | 16777216 | | tmpdir | | | transaction_alloc_block_size | 8192 | | transaction_prealloc_size | 4096 | | tx_isolation | REPEATABLE-READ | | updatable_views_with_limit | YES | | version | 5.0.22 | | version_bdb | Sleepycat Software: Berkeley DB 4.1.24: (May 25, 2006) | | version_comment | Source distribution | | version_compile_machine | x86_64 | | version_compile_os | redhat-linux-gnu | | wait_timeout | 28800 | +---------------------------------+--------------------------------------------------------+218 rows in set (0.00 sec)


    If you need more info please tell me so i can give you.

    Thanks in advanced!
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