This is status when mysqld's memory is 2.1G mysql> show status; +----------------------------+------------+ | Variable_name | Value | +----------------------------+------------+ | Aborted_clients | 12 | | Aborted_connects | 211 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 7029 | | Bytes_received | 1669671027 | | Bytes_sent | 1725443793 | | Com_admin_commands | 81 | | Com_alter_db | 0 | | Com_alter_table | 0 | | Com_analyze | 0 | | Com_backup_table | 0 | | Com_begin | 0 | | Com_change_db | 7083 | | Com_change_master | 0 | | Com_check | 0 | | Com_checksum | 0 | | Com_commit | 363269 | | Com_create_db | 0 | | Com_create_function | 0 | | Com_create_index | 0 | | Com_create_table | 0 | | Com_dealloc_sql | 0 | | Com_delete | 4550 | | 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 | 201919 | | 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 | 1246 | | Com_replace_select | 22 | | Com_reset | 0 | | Com_restore_table | 0 | | Com_revoke | 0 | | Com_revoke_all | 0 | | Com_rollback | 9175 | | Com_savepoint | 0 | | Com_select | 5077533 | | Com_set_option | 10312388 | | Com_show_binlog_events | 1 | | Com_show_binlogs | 12 | | Com_show_charsets | 20 | | Com_show_collations | 7091 | | Com_show_column_types | 0 | | Com_show_create_db | 0 | | Com_show_create_table | 0 | | Com_show_databases | 8 | | Com_show_errors | 0 | | Com_show_fields | 0 | | Com_show_grants | 3 | | Com_show_innodb_status | 0 | | Com_show_keys | 0 | | Com_show_logs | 0 | | Com_show_master_status | 0 | | Com_show_new_master | 0 | | Com_show_open_tables | 0 | | Com_show_privileges | 0 | | Com_show_processlist | 1 | | Com_show_slave_hosts | 2 | | Com_show_slave_status | 0 | | Com_show_status | 11 | | Com_show_storage_engines | 0 | | Com_show_tables | 30 | | Com_show_variables | 7117 | | Com_show_warnings | 4 | | Com_slave_start | 0 | | Com_slave_stop | 0 | | Com_stmt_prepare | 22463 | | Com_stmt_execute | 22455 | | Com_stmt_send_long_data | 0 | | Com_stmt_reset | 43361 | | Com_stmt_close | 773 | | Com_truncate | 0 | | Com_unlock_tables | 0 | | Com_update | 218580 | | Com_update_multi | 0 | | Connections | 7568 | | Created_tmp_disk_tables | 764 | | Created_tmp_files | 3 | | Created_tmp_tables | 1219129 | | Delayed_errors | 0 | | Delayed_insert_threads | 0 | | Delayed_writes | 0 | | Flush_commands | 1 | | Handler_commit | 708760 | | Handler_delete | 0 | | Handler_discover | 0 | | Handler_read_first | 435284 | | Handler_read_key | 150898378 | | Handler_read_next | 1815883954 | | Handler_read_prev | 0 | | Handler_read_rnd | 13716483 | | Handler_read_rnd_next | 45475774 | | Handler_rollback | 7587 | | Handler_update | 21311330 | | Handler_write | 38565593 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 28995 | | Key_blocks_used | 3 | | Key_read_requests | 33834 | | Key_reads | 464 | | Key_write_requests | 10203 | | Key_writes | 0 | | Max_used_connections | 95 | | Not_flushed_delayed_rows | 0 | | Open_files | 7 | | Open_streams | 0 | | Open_tables | 374 | | Opened_tables | 385 | | Qcache_free_blocks | 478 | | Qcache_free_memory | 65304072 | | Qcache_hits | 1108184 | | Qcache_inserts | 3329818 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 1747813 | | Qcache_queries_in_cache | 726 | | Qcache_total_blocks | 1954 | | Questions | 17395125 | | Rpl_status | NULL | | Select_full_join | 202387 | | Select_full_range_join | 0 | | Select_range | 932013 | | Select_range_check | 0 | | Select_scan | 661676 | | Slave_open_temp_tables | 0 | | Slave_running | OFF | | Slave_retried_transactions | 0 | | Slow_launch_threads | 0 | | Slow_queries | 316 | | Sort_merge_passes | 0 | | Sort_range | 831309 | | Sort_rows | 16633037 | | Sort_scan | 463816 | | Table_locks_immediate | 10948892 | | Table_locks_waited | 0 | | Threads_cached | 1 | | Threads_connected | 94 | | Threads_created | 309 | | Threads_running | 15 | | Uptime | 31727 | +----------------------------+------------+ This is status when mysqld's memory is 2.2G mysql> show status; +----------------------------+------------+ | Variable_name | Value | +----------------------------+------------+ | Aborted_clients | 91 | | Aborted_connects | 267 | | Binlog_cache_disk_use | 1 | | Binlog_cache_use | 8109 | | Bytes_received | 3960015868 | | Bytes_sent | 1612337217 | | Com_admin_commands | 962 | | Com_alter_db | 0 | | Com_alter_table | 0 | | Com_analyze | 0 | | Com_backup_table | 0 | | Com_begin | 0 | | Com_change_db | 8603 | | Com_change_master | 0 | | Com_check | 0 | | Com_checksum | 0 | | Com_commit | 263325 | | Com_create_db | 0 | | Com_create_function | 0 | | Com_create_index | 0 | | Com_create_table | 0 | | Com_dealloc_sql | 0 | | Com_delete | 2275 | | 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 | 133344 | | Com_insert_select | 0 | | Com_kill | 0 | | Com_load | 1 | | 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 | 1017 | | Com_replace_select | 23 | | Com_reset | 0 | | Com_restore_table | 0 | | Com_revoke | 0 | | Com_revoke_all | 0 | | Com_rollback | 11365 | | Com_savepoint | 0 | | Com_select | 3368428 | | Com_set_option | 7137209 | | Com_show_binlog_events | 0 | | Com_show_binlogs | 1 | | Com_show_charsets | 4 | | Com_show_collations | 8607 | | Com_show_column_types | 0 | | Com_show_create_db | 0 | | Com_show_create_table | 0 | | Com_show_databases | 3 | | 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_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 | 2 | | Com_show_storage_engines | 0 | | Com_show_tables | 10 | | Com_show_variables | 8611 | | Com_show_warnings | 0 | | Com_slave_start | 0 | | Com_slave_stop | 0 | | Com_stmt_prepare | 15622 | | Com_stmt_execute | 15621 | | Com_stmt_send_long_data | 0 | | Com_stmt_reset | 30618 | | Com_stmt_close | 311 | | Com_truncate | 0 | | Com_unlock_tables | 0 | | Com_update | 533634 | | Com_update_multi | 0 | | Connections | 18671 | | Created_tmp_disk_tables | 369 | | Created_tmp_files | 1 | | Created_tmp_tables | 853824 | | Delayed_errors | 0 | | Delayed_insert_threads | 0 | | Delayed_writes | 0 | | Flush_commands | 2 | | Handler_commit | 504741 | | Handler_delete | 0 | | Handler_discover | 0 | | Handler_read_first | 315249 | | Handler_read_key | 113943782 | | Handler_read_next | 1943409640 | | Handler_read_prev | 0 | | Handler_read_rnd | 9339826 | | Handler_read_rnd_next | 34991931 | | Handler_rollback | 9740 | | Handler_update | 18049759 | | Handler_write | 28993101 | | Key_blocks_not_flushed | 0 | | Key_blocks_unused | 28995 | | Key_blocks_used | 6 | | Key_read_requests | 10391 | | Key_reads | 167 | | Key_write_requests | 4140 | | Key_writes | 0 | | Max_used_connections | 107 | | Not_flushed_delayed_rows | 0 | | Open_files | 7 | | Open_streams | 0 | | Open_tables | 407 | | Opened_tables | 936 | | Qcache_free_blocks | 296 | | Qcache_free_memory | 65795488 | | Qcache_hits | 815050 | | Qcache_inserts | 2163418 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 1205094 | | Qcache_queries_in_cache | 514 | | Qcache_total_blocks | 1350 | | Questions | 37300338 | | Rpl_status | NULL | | Select_full_join | 145228 | | Select_full_range_join | 0 | | Select_range | 642425 | | Select_range_check | 0 | | Select_scan | 471707 | | Slave_open_temp_tables | 0 | | Slave_running | OFF | | Slave_retried_transactions | 0 | | Slow_launch_threads | 0 | | Slow_queries | 172 | | Sort_merge_passes | 0 | | Sort_range | 554889 | | Sort_rows | 11451353 | | Sort_scan | 318701 | | Table_locks_immediate | 7603693 | | Table_locks_waited | 0 | | Threads_cached | 4 | | Threads_connected | 42 | | Threads_created | 512 | | Threads_running | 4 | | Uptime | 80297 | +----------------------------+------------+ 162 rows in set (0.00 sec) This is variable's value in DB mysql> show variables; +---------------------------------+-----------------------------------------------------------------------------------------------------+ | Variable_name | Value | +---------------------------------+-----------------------------------------------------------------------------------------------------+ | back_log | 50 | | basedir | /usr/local/mysql-standard-4.1.14-pc-linux-gnu-i686/| | binlog_cache_size | 1048576 | | bulk_insert_buffer_size | 67108864 | | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/local/mysql-standard-4.1.14-pc-linux-gnu-i686/share/mysql/charsets/ | | collation_connection | utf8_general_ci | | collation_database | utf8_general_ci | | collation_server | utf8_general_ci | | concurrent_insert | ON | | connect_timeout | 5 | | datadir | /data1/mysql/data/ | | 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 | | 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 | YES | | have_bdb | NO | | have_blackhole_engine | NO | | have_compress | YES | | have_crypt | YES | | have_csv | NO | | have_example_engine | NO | | have_geometry | YES | | have_innodb | YES | | have_isam | NO | | have_ndbcluster | NO | | have_openssl | NO | | have_query_cache | YES | | have_raid | YES | | have_rtree_keys | YES | | have_symlink | YES | | init_connect | | | init_file | | | init_slave | | | innodb_additional_mem_pool_size | 16777216 | | innodb_autoextend_increment | 8 | | innodb_buffer_pool_awe_mem_mb | 0 | | innodb_buffer_pool_size | 1887436800 | | innodb_data_file_path | hp_data1:2G;...hp_data50:2G; | | innodb_data_home_dir | /data1/mysql/data | | innodb_fast_shutdown | ON | | innodb_file_io_threads | 4 | | innodb_file_per_table | OFF | | innodb_flush_log_at_trx_commit | 0 | | innodb_flush_method | | | innodb_force_recovery | 0 | | innodb_lock_wait_timeout | 10 | | innodb_locks_unsafe_for_binlog | OFF | | innodb_log_arch_dir | /data1/mysql/log_arch | | innodb_log_archive | OFF | | innodb_log_buffer_size | 8388608 | | innodb_log_file_size | 268435456 | | innodb_log_files_in_group | 3 | | innodb_log_group_home_dir | /data2/mysql/log_group | | innodb_max_dirty_pages_pct | 90 | | innodb_max_purge_lag | 0 | | innodb_mirrored_log_groups | 1 | | innodb_open_files | 300 | | innodb_table_locks | ON | | innodb_thread_concurrency | 16 | | interactive_timeout | 386400 | | join_buffer_size | 8384512 | | key_buffer_size | 33554432 | | key_cache_age_threshold | 300 | | key_cache_block_size | 1024 | | key_cache_division_limit | 100 | | language | /usr/local/mysql-standard-4.1.14-pc-linux-gnu-i686/share/mysql/english/ | | large_files_support | ON | | license | GPL | | local_infile | ON | | locked_in_memory | OFF | | log | OFF | | log_bin | ON | | log_error | | | log_slave_updates | OFF | | log_slow_queries | ON | | log_update | 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 | 16776192 | | max_binlog_cache_size | 4294967295 | | max_binlog_size | 1073741824 | | max_connect_errors | 10 | | max_connections | 200 | | max_delayed_threads | 20 | | max_error_count | 64 | | max_heap_table_size | 67107840 | | max_insert_delayed_threads | 20 | | max_join_size | 4294967295 | | max_length_for_sort_data | 1024 | | max_relay_log_size | 0 | | max_seeks_for_key | 4294967295 | | max_sort_length | 1024 | | max_tmp_tables | 32 | | max_user_connections | 0 | | max_write_lock_count | 4294967295 | | myisam_data_pointer_size | 4 | | myisam_max_extra_sort_file_size | 10737418240 | | myisam_max_sort_file_size | 10737418240 | | myisam_recover_options | DEFAULT | | myisam_repair_threads | 1 | | myisam_sort_buffer_size | 134217728 | | net_buffer_length | 16384 | | net_read_timeout | 30 | | net_retry_count | 10 | | net_write_timeout | 60 | | new | OFF | | old_passwords | OFF | | open_files_limit | 1024 | | pid_file | /data1/mysql/data/hpdb.pid | | port | 3306 | | preload_buffer_size | 32768 | | protocol_version | 10 | | query_alloc_block_size | 8192 | | query_cache_limit | 2097152 | | query_cache_min_res_unit | 4096 | | query_cache_size | 67108864 | | query_cache_type | ON | | query_cache_wlock_invalidate | OFF | | query_prealloc_size | 8192 | | range_alloc_block_size | 2048 | | read_buffer_size | 2093056 | | read_only | OFF | | read_rnd_buffer_size | 16773120 | | relay_log_purge | ON | | relay_log_space_limit | 0 | | rpl_recovery_rank | 0 | | secure_auth | OFF | | server_id | 1 | | skip_external_locking | ON | | skip_networking | OFF | | skip_show_database | OFF | | slave_net_timeout | 3600 | | slave_transaction_retries | 0 | | slow_launch_time | 2 | | socket | /data2/mysql/mysql.sock | | sort_buffer_size | 8388600 | | sql_mode | | | storage_engine | MyISAM | | sql_notes | OFF | | sql_warnings | OFF | | sync_binlog | 0 | | sync_replication | 0 | | sync_replication_slave_id | 0 | | sync_replication_timeout | 0 | | sync_frm | ON | | system_time_zone | JST | | table_cache | 407 | | table_type | MyISAM | | thread_cache_size | 8 | | thread_stack | 126976 | | time_format | %H:%i:%s | | time_zone | SYSTEM | | tmp_table_size | 67108864 | | tmpdir | | | transaction_alloc_block_size | 8192 | | transaction_prealloc_size | 4096 | | tx_isolation | READ-UNCOMMITTED | | version | 4.1.14-standard-log | | version_comment | MySQL Community Edition - Standard (GPL) | | version_compile_machine | i686 | | version_compile_os | pc-linux-gnu | | wait_timeout | 386400 | +---------------------------------+-----------------------------------------------------------------------------------------------------+ 184 rows in set (0.00 sec)