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Re: MySQL 5.5 hangs frequently in production environment
Posted by: Murtaza Doctor
Date: July 03, 2014 06:03AM

Hi Rick,

Please note that max_connections is currently set to 4000 in our database.
Production databases have been setup in master-slave configuration.
These databases are accessed by a Java-based application (6 instances) hosted by J-Boss application servers.
Number of connections being established by the application have been reduced and we are working for further application tuning.

But we face the hang issues with both master and slave databases consistently.

Please find below the required outputs from the master database.

SHOW GLOBAL STATUS output:
--------------------------------------------
Variable_name Value
--------------------------------------------
Aborted_clients 35
Aborted_connects 0
Binlog_cache_disk_use 60
Binlog_cache_use 73644
Bytes_received 406636714
Bytes_sent 2704832139
Com_admin_commands 19
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 1154
Com_binlog 0
Com_call_procedure 41114
Com_change_db 82208
Com_change_master 0
Com_check 0
Com_checksum 0
Com_commit 102610
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 39783
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_resignal 0
Com_restore_table 0
Com_revoke 0
Com_revoke_all 0
Com_rollback 1782
Com_rollback_to_savepoint 0
Com_savepoint 0
Com_select 555555
Com_set_option 205679
Com_signal 0
Com_show_authors 0
Com_show_binlog_events 0
Com_show_binlogs 0
Com_show_charsets 59
Com_show_collations 353
Com_show_contributors 0
Com_show_create_db 0
Com_show_create_event 0
Com_show_create_func 0
Com_show_create_proc 41102
Com_show_create_table 0
Com_show_create_trigger 0
Com_show_databases 4
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_relaylog_events 0
Com_show_slave_hosts 0
Com_show_slave_status 0
Com_show_status 4
Com_show_storage_engines 0
Com_show_table_status 0
Com_show_tables 1477
Com_show_triggers 0
Com_show_variables 725
Com_show_warnings 0
Com_slave_start 0
Com_slave_stop 0
Com_stmt_close 304940
Com_stmt_execute 305947
Com_stmt_fetch 0
Com_stmt_prepare 304977
Com_stmt_reprepare 0
Com_stmt_reset 0
Com_stmt_send_long_data 118
Com_truncate 0
Com_uninstall_plugin 0
Com_unlock_tables 0
Com_update 43653
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 385
Created_tmp_disk_tables 232
Created_tmp_files 78
Created_tmp_tables 10778
Delayed_errors 0
Delayed_insert_threads 0
Delayed_writes 0
Flush_commands 1
Handler_commit 755640
Handler_delete 0
Handler_discover 0
Handler_prepare 312100
Handler_read_first 95226
Handler_read_key 399929560
Handler_read_next 268320381
Handler_read_prev 4196
Handler_read_rnd 1050627
Handler_read_rnd_next 382939695
Handler_rollback 696
Handler_savepoint 0
Handler_savepoint_rollback 0
Handler_update 44143
Handler_write 470400
Innodb_buffer_pool_pages_data 179943
Innodb_buffer_pool_pages_dirty 5290
Innodb_buffer_pool_pages_flushed 58874
Innodb_buffer_pool_pages_free 596898
Innodb_buffer_pool_pages_misc 9591
Innodb_buffer_pool_pages_total 786432
Innodb_buffer_pool_read_ahead 13209
Innodb_buffer_pool_read_ahead_evicted 0
Innodb_buffer_pool_read_requests 1467179649
Innodb_buffer_pool_reads 155809
Innodb_buffer_pool_wait_free 0
Innodb_buffer_pool_write_requests 865455
Innodb_data_fsyncs 156680
Innodb_data_pending_fsyncs 0
Innodb_data_pending_reads 0
Innodb_data_pending_writes 0
Innodb_data_read 2899087360
Innodb_data_reads 163701
Innodb_data_writes 198390
Innodb_data_written 2077865472
Innodb_dblwr_pages_written 58874
Innodb_dblwr_writes 1273
Innodb_have_atomic_builtins OFF
Innodb_log_waits 0
Innodb_log_write_requests 157196
Innodb_log_writes 145994
Innodb_os_log_fsyncs 146481
Innodb_os_log_pending_fsyncs 0
Innodb_os_log_pending_writes 0
Innodb_os_log_written 148432896
Innodb_page_size 16384
Innodb_pages_created 3131
Innodb_pages_read 176812
Innodb_pages_written 58874
Innodb_row_lock_current_waits 27
Innodb_row_lock_time 43617465
Innodb_row_lock_time_avg 82452
Innodb_row_lock_time_max 1001488
Innodb_row_lock_waits 529
Innodb_rows_deleted 0
Innodb_rows_inserted 39524
Innodb_rows_read 813279839
Innodb_rows_updated 43611
Key_blocks_not_flushed 0
Key_blocks_unused 53577
Key_blocks_used 9
Key_read_requests 1852
Key_reads 8
Key_write_requests 112
Key_writes 0
Last_query_cost 0.000000
Max_used_connections 186
Not_flushed_delayed_rows 0
Open_files 47
Open_streams 0
Open_table_definitions 260
Open_tables 769
Opened_files 1337
Opened_table_definitions 260
Opened_tables 776
Prepared_stmt_count 32
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 3137190
Questions 868114
Rpl_status NULL
Select_full_join 2626
Select_full_range_join 325
Select_range 14941
Select_range_check 0
Select_scan 94128
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 31
Sort_merge_passes 12
Sort_range 6007
Sort_rows 1004159
Sort_scan 3129
Table_locks_immediate 626086
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 174
Threads_created 377
Threads_running 30
Uptime 5327
Uptime_since_flush_status 5327
========================

** SHOW VARIABLES output

Variable_name Value
auto_increment_increment 1
auto_increment_offset 1
autocommit ON
automatic_sp_privileges ON
back_log 50
basedir /usr/local/mysql/
big_tables OFF
binlog_cache_size 32768
binlog_direct_non_transactional_updates OFF
binlog_format MIXED
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/local/mysql/share/charsets/
collation_connection utf8_general_ci
collation_database utf8_general_ci
collation_server utf8_general_ci
completion_type 0
concurrent_insert 1
connect_timeout 10
datadir /hdiits_master/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
div_precision_increment 4
engine_condition_pushdown ON
error_count 0
event_scheduler ON
expire_logs_days 0
flush OFF
flush_time 0
foreign_key_checks ON
ft_boolean_syntax + -><()~*:""&|
ft_max_word_len 84
ft_min_word_len 4
ft_query_expansion_limit 20
ft_stopword_file (built-in)
general_log OFF
general_log_file /hdiits_master/mysql/data/hmdcdb1.log
group_concat_max_len 1024
have_compress YES
have_crypt YES
have_csv YES
have_dynamic_loading YES
have_geometry YES
have_innodb YES
have_ndbcluster NO
have_openssl NO
have_partitioning YES
have_profiling YES
have_query_cache YES
have_rtree_keys YES
have_ssl NO
have_symlink YES
hostname hmdcdb1.gujhdiits.local
identity 0
ignore_builtin_innodb OFF
init_connect SET AUTOCOMMIT=0
init_file
init_slave
innodb_adaptive_flushing ON
innodb_adaptive_hash_index ON
innodb_additional_mem_pool_size 104857600
innodb_autoextend_increment 8
innodb_autoinc_lock_mode 1
innodb_buffer_pool_size 10737418240
innodb_change_buffering inserts
innodb_checksums ON
innodb_commit_concurrency 0
innodb_concurrency_tickets 500
innodb_data_file_path ibdata1:500M:autoextend
innodb_data_home_dir
innodb_doublewrite ON
innodb_fast_shutdown 1
innodb_file_format Antelope
innodb_file_format_check Barracuda
innodb_file_per_table ON
innodb_flush_log_at_trx_commit 1
innodb_flush_method O_DIRECT
innodb_force_recovery 0
innodb_io_capacity 200
innodb_lock_wait_timeout 1000
innodb_locks_unsafe_for_binlog OFF
innodb_log_buffer_size 16777216
innodb_log_file_size 268435456
innodb_log_files_in_group 2
innodb_log_group_home_dir /hdiits_master/mysql/innodblog
innodb_max_dirty_pages_pct 75
innodb_max_purge_lag 0
innodb_mirrored_log_groups 1
innodb_old_blocks_pct 37
innodb_old_blocks_time 0
innodb_open_files 300
innodb_read_ahead_threshold 56
innodb_read_io_threads 4
innodb_replication_delay 0
innodb_rollback_on_timeout OFF
innodb_spin_wait_delay 6
innodb_stats_on_metadata ON
innodb_stats_sample_pages 8
innodb_strict_mode OFF
innodb_support_xa ON
innodb_sync_spin_loops 30
innodb_table_locks ON
innodb_thread_concurrency 50
innodb_thread_sleep_delay 10000
innodb_use_sys_malloc ON
innodb_version 1.0.6
innodb_write_io_threads 4
insert_id 0
interactive_timeout 28800
join_buffer_size 131072
keep_files_on_create OFF
key_buffer_size 67108864
key_cache_age_threshold 300
key_cache_block_size 1024
key_cache_division_limit 100
large_files_support ON
large_page_size 0
large_pages OFF
last_insert_id 0
lc_messages en_US
lc_messages_dir /usr/local/mysql/share/
lc_time_names en_US
license GPL
local_infile ON
locked_in_memory OFF
log OFF
log_bin ON
log_bin_trust_function_creators ON
log_bin_trust_routine_creators ON
log_error /hdiitsdb_logs/logs/err.log
log_output FILE
log_queries_not_using_indexes OFF
log_slave_updates OFF
log_slow_queries ON
log_warnings 1
long_query_time 300.000000
low_priority_updates OFF
lower_case_file_system OFF
lower_case_table_names 1
max_allowed_packet 524288000
max_binlog_cache_size 4294967296
max_binlog_size 524288000
max_connect_errors 10
max_connections 4000
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
min_examined_row_limit 0
multi_range_count 256
myisam_data_pointer_size 6
myisam_max_sort_file_size 9223372036853727232
myisam_mmap_size 18446744073709551615
myisam_recover_options OFF
myisam_repair_threads 1
myisam_sort_buffer_size 8388608
myisam_stats_method nulls_unequal
myisam_use_mmap OFF
net_buffer_length 8192
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
new OFF
old OFF
old_alter_table OFF
old_passwords OFF
open_files_limit 20000
optimizer_prune_level 1
optimizer_search_depth 62
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on
pid_file /etc/cmcluster/masterpkg/mysql.pid
plugin_dir /usr/local/mysql/lib/plugin
port 3308
preload_buffer_size 32768
profiling OFF
profiling_history_size 15
protocol_version 10
pseudo_thread_id 4800
query_alloc_block_size 8192
query_cache_limit 1048576
query_cache_min_res_unit 4096
query_cache_size 0
query_cache_type ON
query_cache_wlock_invalidate OFF
query_prealloc_size 8192
rand_seed1
rand_seed2
range_alloc_block_size 4096
read_buffer_size 262144
read_only OFF
read_rnd_buffer_size 524288
relay_log
relay_log_index
relay_log_info_file relay-log.info
relay_log_purge ON
relay_log_recovery OFF
relay_log_space_limit 0
report_host
report_password
report_port 3306
report_user
rpl_recovery_rank 0
secure_auth OFF
secure_file_priv
server_id 1
skip_external_locking ON
skip_networking OFF
skip_show_database OFF
slave_compressed_protocol OFF
slave_exec_mode STRICT
slave_load_tmpdir /hdiits_master/mysql/tmpdir
slave_net_timeout 3600
slave_skip_errors OFF
slave_transaction_retries 10
slow_launch_time 2
slow_query_log ON
slow_query_log_file /hdiitsdb_logs/slowlog/master_slow.log
socket /tmp/mysql.sock
sort_buffer_size 524288
sql_auto_is_null ON
sql_big_selects ON
sql_big_tables OFF
sql_buffer_result OFF
sql_log_bin ON
sql_log_off OFF
sql_log_update ON
sql_low_priority_updates OFF
sql_max_join_size 18446744073709551615
sql_mode
sql_notes ON
sql_quote_show_create ON
sql_safe_updates OFF
sql_select_limit 18446744073709551615
sql_slave_skip_counter
sql_warnings OFF
ssl_ca
ssl_capath
ssl_cert
ssl_cipher
ssl_key
storage_engine InnoDB
sync_binlog 0
sync_frm ON
sync_master_info 0
sync_relay_log 0
sync_relay_log_info 0
system_time_zone IST
table_definition_cache 2000
table_lock_wait_timeout 50
table_open_cache 4000
table_type InnoDB
thread_cache_size 0
thread_handling one-thread-per-connection
thread_stack 262144
time_format %H:%i:%s
time_zone SYSTEM
timed_mutexes OFF
timestamp 1397113829
tmp_table_size 16777216
tmpdir /hdiits_master/mysql/tmpdir
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
tx_isolation REPEATABLE-READ
unique_checks ON
updatable_views_with_limit YES
version 5.5.2-m2-log
version_comment MySQL Community Server (GPL)
version_compile_machine ia64
version_compile_os hp-hpux11.31
wait_timeout 28800
warning_count 0
------------------

Thanks,
Murtaza.

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