mysql have lots of ' sleep null' process, and caused php takes up 100% cpu
Posted by: Meteor SY
Date: April 22, 2013 09:03AM
Date: April 22, 2013 09:03AM
Hi All,
I'm using php and mysql to host a forum.
Currently we have about 10,000 users online at the same time.
The database is about 8G.
nginx+php-fpm+mysql are running on the same servers. The server has 32G memory and 2 * 16 core CPUs.
Now I found that once the users number is bigger than 10000, php-fpm always takes up all CPU resources. When the issue happens, I checked mysql using 'show full processlist', and found that there are hundreds of 'sleep and null' querys like below
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
Below is my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
server-id = 1
port = 3306
socket = /tmp/mysql.sock
default-storage-engine=MyISAM
ignore-builtin-innodb
skip-external-locking
skip-networking
skip-name-resolve
event_scheduler = 1
sql-mode = NO_UNSIGNED_SUBTRACTION
max_allowed_packet = 64M
max_connections = 768
max_connect_errors = 1844674407370954751
slow_launch_time=2
general-log=0
slow_query_log=1
slow-query-log-file=/log/slowquery.log
long_query_time=2
wait_timeout = 10
connect_timeout = 10
interactive_timeout = 10
tmp_table_size=512M
max_heap_table_size=512M
key_buffer_size = 512M
join_buffer_size = 3M
read_buffer_size = 4M
sort_buffer_size =4M
myisam_sort_buffer_size = 128M
table_open_cache = 2048
read_rnd_buffer_size = 8M
query_cache_limit = 2M
query_cache_size = 1024M
query_cache_min_res_unit = 2K
thread_concurrency = 48
thread_cache_size = 512
open-files-limit=10240
low-priority-updates=1
concurrent_insert=ALWAYS
[mysqldump]
quick
max_allowed_packet = 20M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 256M
read_buffer = 64M
write_buffer = 64M
[mysqlhotcopy]
interactive-timeout
And tuning-primer.sh
SLOW QUERIES
The slow query log is enabled.
Current long_query_time = 2.000000 sec.
You have 285 out of 5751642 that take longer than 2.000000 sec. to complete
[: 0.00000000000000000000: bad number
Your long_query_time seems to be fine
BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/5.5/en/point-in-time-recovery.html
WORKER THREADS
Current thread_cache_size = 512
Current threads_cached = 248
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 768
Current threads_connected = 4
Historic max_used_connections = 253
The number of used connections is 32% of the configured maximum.
Your max_connections variable seems to be fine.
No InnoDB Support Enabled!
MEMORY USAGE
Max Memory Ever Allocated : 6.25 G
Configured Max Per-thread Buffers : 14.43 G
Configured Max Global Buffers : 1.50 G
Configured Max Memory Limit : 15.93 G
Physical Memory : 32.75 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 1.51 G
Current key_buffer_size = 512 M
Key cache miss rate is 1 : 334
Key buffer free ratio = 40 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere
QUERY CACHE
Query cache is enabled
Current query_cache_size = 1.00 G
Current query_cache_used = 194 M
Current query_cache_limit = 2 M
Current Query cache Memory fill ratio = 18.96 %
Current query_cache_min_res_unit = 2 K
Your query_cache_size seems to be too high.
Perhaps you can use these resources elsewhere
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 4 M
Current read_rnd_buffer_size = 8 M
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 3.00 M
You have had 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly
OPEN FILES LIMIT
Current open_files_limit = 10240 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_open_cache = 2048 tables
Current table_definition_cache = 400 tables
You have a total of 347 tables
You have 676 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 512 M
Current tmp_table_size = 512 M
Of 2971 temp tables, 6% were created on disk
Created disk tmp tables ratio seems fine
TABLE SCANS
Current read_buffer_size = 4 M
Current table scan ratio = 323 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 90
You may benefit from selective use of InnoDB.
And show status;
mysql> show status;
+------------------------------------------+-------------+
| Variable_name | Value |
+------------------------------------------+-------------+
| Aborted_clients | 1330 |
| Aborted_connects | 5 |
| Binlog_cache_disk_use | 0 |
| Binlog_cache_use | 0 |
| Binlog_stmt_cache_disk_use | 0 |
| Binlog_stmt_cache_use | 0 |
| Bytes_received | 137 |
| Bytes_sent | 183 |
| 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 | 1 |
| 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 | 532549 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 18890 |
| 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 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 210429 |
| Key_blocks_used | 218255 |
| Key_read_requests | 75182109 |
| Key_reads | 222986 |
| Key_write_requests | 282796 |
| Key_writes | 261528 |
| Last_query_cost | 0.000000 |
| Max_used_connections | 253 |
| Not_flushed_delayed_rows | 0 |
| Open_files | 969 |
| Open_streams | 0 |
| Open_table_definitions | 347 |
| Open_tables | 676 |
| Opened_files | 24897 |
| 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 | 17584 |
| Qcache_free_memory | 860674168 |
| Qcache_hits | 1080677 |
| Qcache_inserts | 1985418 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 9019 |
| Qcache_queries_in_cache | 54664 |
| Qcache_total_blocks | 127744 |
| Queries | 5815720 |
| Questions | 2 |
| 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 | 3248854 |
| Table_locks_waited | 35885 |
| Tc_log_max_pages_used | 0 |
| Tc_log_page_size | 0 |
| Tc_log_page_waits | 0 |
| Threads_cached | 245 |
| Threads_connected | 8 |
| Threads_created | 253 |
| Threads_running | 6 |
| Uptime | 5375 |
| Uptime_since_flush_status | 5375 |
+------------------------------------------+-------------+
Anyone can help me to optimize mysql?
I'm using php and mysql to host a forum.
Currently we have about 10,000 users online at the same time.
The database is about 8G.
nginx+php-fpm+mysql are running on the same servers. The server has 32G memory and 2 * 16 core CPUs.
Now I found that once the users number is bigger than 10000, php-fpm always takes up all CPU resources. When the issue happens, I checked mysql using 'show full processlist', and found that there are hundreds of 'sleep and null' querys like below
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
| localhost | forums | Sleep | 0 | | NULL
Below is my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
server-id = 1
port = 3306
socket = /tmp/mysql.sock
default-storage-engine=MyISAM
ignore-builtin-innodb
skip-external-locking
skip-networking
skip-name-resolve
event_scheduler = 1
sql-mode = NO_UNSIGNED_SUBTRACTION
max_allowed_packet = 64M
max_connections = 768
max_connect_errors = 1844674407370954751
slow_launch_time=2
general-log=0
slow_query_log=1
slow-query-log-file=/log/slowquery.log
long_query_time=2
wait_timeout = 10
connect_timeout = 10
interactive_timeout = 10
tmp_table_size=512M
max_heap_table_size=512M
key_buffer_size = 512M
join_buffer_size = 3M
read_buffer_size = 4M
sort_buffer_size =4M
myisam_sort_buffer_size = 128M
table_open_cache = 2048
read_rnd_buffer_size = 8M
query_cache_limit = 2M
query_cache_size = 1024M
query_cache_min_res_unit = 2K
thread_concurrency = 48
thread_cache_size = 512
open-files-limit=10240
low-priority-updates=1
concurrent_insert=ALWAYS
[mysqldump]
quick
max_allowed_packet = 20M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 256M
read_buffer = 64M
write_buffer = 64M
[mysqlhotcopy]
interactive-timeout
And tuning-primer.sh
SLOW QUERIES
The slow query log is enabled.
Current long_query_time = 2.000000 sec.
You have 285 out of 5751642 that take longer than 2.000000 sec. to complete
[: 0.00000000000000000000: bad number
Your long_query_time seems to be fine
BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/5.5/en/point-in-time-recovery.html
WORKER THREADS
Current thread_cache_size = 512
Current threads_cached = 248
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 768
Current threads_connected = 4
Historic max_used_connections = 253
The number of used connections is 32% of the configured maximum.
Your max_connections variable seems to be fine.
No InnoDB Support Enabled!
MEMORY USAGE
Max Memory Ever Allocated : 6.25 G
Configured Max Per-thread Buffers : 14.43 G
Configured Max Global Buffers : 1.50 G
Configured Max Memory Limit : 15.93 G
Physical Memory : 32.75 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 1.51 G
Current key_buffer_size = 512 M
Key cache miss rate is 1 : 334
Key buffer free ratio = 40 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere
QUERY CACHE
Query cache is enabled
Current query_cache_size = 1.00 G
Current query_cache_used = 194 M
Current query_cache_limit = 2 M
Current Query cache Memory fill ratio = 18.96 %
Current query_cache_min_res_unit = 2 K
Your query_cache_size seems to be too high.
Perhaps you can use these resources elsewhere
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 4 M
Current read_rnd_buffer_size = 8 M
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 3.00 M
You have had 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly
OPEN FILES LIMIT
Current open_files_limit = 10240 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_open_cache = 2048 tables
Current table_definition_cache = 400 tables
You have a total of 347 tables
You have 676 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 512 M
Current tmp_table_size = 512 M
Of 2971 temp tables, 6% were created on disk
Created disk tmp tables ratio seems fine
TABLE SCANS
Current read_buffer_size = 4 M
Current table scan ratio = 323 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 90
You may benefit from selective use of InnoDB.
And show status;
mysql> show status;
+------------------------------------------+-------------+
| Variable_name | Value |
+------------------------------------------+-------------+
| Aborted_clients | 1330 |
| Aborted_connects | 5 |
| Binlog_cache_disk_use | 0 |
| Binlog_cache_use | 0 |
| Binlog_stmt_cache_disk_use | 0 |
| Binlog_stmt_cache_use | 0 |
| Bytes_received | 137 |
| Bytes_sent | 183 |
| 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 | 1 |
| 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 | 532549 |
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 18890 |
| 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 |
| Key_blocks_not_flushed | 0 |
| Key_blocks_unused | 210429 |
| Key_blocks_used | 218255 |
| Key_read_requests | 75182109 |
| Key_reads | 222986 |
| Key_write_requests | 282796 |
| Key_writes | 261528 |
| Last_query_cost | 0.000000 |
| Max_used_connections | 253 |
| Not_flushed_delayed_rows | 0 |
| Open_files | 969 |
| Open_streams | 0 |
| Open_table_definitions | 347 |
| Open_tables | 676 |
| Opened_files | 24897 |
| 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 | 17584 |
| Qcache_free_memory | 860674168 |
| Qcache_hits | 1080677 |
| Qcache_inserts | 1985418 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 9019 |
| Qcache_queries_in_cache | 54664 |
| Qcache_total_blocks | 127744 |
| Queries | 5815720 |
| Questions | 2 |
| 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 | 3248854 |
| Table_locks_waited | 35885 |
| Tc_log_max_pages_used | 0 |
| Tc_log_page_size | 0 |
| Tc_log_page_waits | 0 |
| Threads_cached | 245 |
| Threads_connected | 8 |
| Threads_created | 253 |
| Threads_running | 6 |
| Uptime | 5375 |
| Uptime_since_flush_status | 5375 |
+------------------------------------------+-------------+
Anyone can help me to optimize mysql?
Subject
Views
Written By
Posted
mysql have lots of ' sleep null' process, and caused php takes up 100% cpu
11609
April 22, 2013 09:03AM
3796
April 22, 2013 07:31PM
3803
April 23, 2013 11:22PM
Sorry, you can't reply to this topic. It has been closed.
Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.