Hi All,
First of all, thanks for even reading this. Any help, advise, wisdom,
assistance would be greatly appreciated.
Here's the problem:
I am a systems admin who's having serious MySQL load problems. Our
application is a database that provides solutions to mostly hospitals. At
one of our largest customer hospitals, we've been noticing major performance
issues where the application drags and hangs for 30 seconds to sometimes 3
minutes when retreiving data and returning it to our web page. We use PHP
as our front end. We have Zend Accellerator installed on the front end. IIS
6.0, MYSQL 4.0.25. The database size is about 600MB. We find that the
database is slowest when more users (about 40-60) are logged into our
application. When less users are on, the application is much faster.
Now, our developers know that they have to reprogram the app (queries,
etc)., but in the meantime, we cant let our customer continue experiencing
these issues. I know for sure that most of the problem has to do with the
load on the server. It's a Dell 1850 with Dual Xeon Processors and about 4
Gigs of RAM. We are using MyISM tables. I am replicating to another server
Should I changeover to the NDB storage type and start clustering? I mean
since it stores all of the data in memory, shouldn't that give me better
performance? Should I setup a farm of slave servers and load balance them
(which we really dont want to do). Any suggestions?
The following are the settings from my SHOW VARIABLES:
back_log 50
basedir d:\mysql\
bdb_cache_size 8388572
bdb_log_buffer_size 262144
bdb_home d:\mysql\data\
bdb_max_lock 10000
bdb_logdir
bdb_shared_data OFF
bdb_tmpdir C:\WINDOWS\TEMP\
bdb_version Sleepycat Software: Berkeley DB 3.2.9a: (June 29, 2005)
binlog_cache_size 32768
bulk_insert_buffer_size 8388608
character_set latin1
character_sets latin1 big5 czech euc_kr gb2312 gbk latin1_de sjis tis620
ujis dec8 dos german1 hp8 koi8_ru latin2 swe7 usa7 cp1251 danish hebrew
win1251 estonia hungarian koi8_ukr win1251ukr greek win1250 croat cp1257
latin5
concurrent_insert ON
connect_timeout 5
convert_character_set
datadir d:\mysql\data\
default_week_format 0
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
flush OFF
flush_time 1800
ft_boolean_syntax + -><()~*:""&|
ft_min_word_len 4
ft_max_word_len 254
ft_max_word_len_for_sort 20
ft_stopword_file (built-in)
have_bdb YES
have_crypt NO
have_innodb DISABLED
have_isam YES
have_raid NO
have_symlink YES
have_openssl NO
have_query_cache YES
init_file
innodb_additional_mem_pool_size 1048576
innodb_autoextend_increment 8
innodb_buffer_pool_size 8388608
innodb_data_file_path
innodb_data_home_dir
innodb_file_io_threads 4
innodb_force_recovery 0
innodb_thread_concurrency 8
innodb_flush_log_at_trx_commit 1
innodb_fast_shutdown ON
innodb_flush_method
innodb_lock_wait_timeout 50
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_mirrored_log_groups 1
innodb_max_dirty_pages_pct 90
innodb_max_purge_lag 0
innodb_table_locks ON
interactive_timeout 28800
join_buffer_size 131072
key_buffer_size 402653184
language d:\mysql\share\english\
large_files_support ON
license GPL
local_infile ON
log OFF
log_update OFF
log_bin ON
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 1
max_allowed_packet 1048576
max_binlog_cache_size 4294967295
max_binlog_size 1073741824
max_connections 100
max_connect_errors 10
max_delayed_threads 20
max_insert_delayed_threads 20
max_heap_table_size 16777216
max_join_size 4294967295
max_relay_log_size 0
max_seeks_for_key 4294967295
max_sort_length 1024
max_user_connections 0
max_tmp_tables 32
max_write_lock_count 4294967295
myisam_max_extra_sort_file_size 107374182400
myisam_max_sort_file_size 107374182400
myisam_repair_threads 1
myisam_recover_options OFF
myisam_sort_buffer_size 214958080
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
new OFF
open_files_limit 0
pid_file d:\mysql\data\PEMINIC-220.pid
log_error .\PEMINIC-220.err
port 3306
protocol_version 10
query_alloc_block_size 8192
query_cache_limit 1048576
query_cache_size 33554432
query_cache_type ON
query_cache_wlock_invalidate OFF
query_prealloc_size 8192
range_alloc_block_size 2048
read_buffer_size 126976
read_only OFF
read_rnd_buffer_size 520192
rpl_recovery_rank 0
server_id 220
slave_net_timeout 3600
skip_external_locking ON
skip_networking OFF
skip_show_database OFF
slow_launch_time 2
sort_buffer_size 262108
sql_mode 0
table_cache 512
table_type MYISAM
thread_cache_size 0
thread_stack 196608
tx_isolation REPEATABLE-READ
timezone Eastern Daylight Time
tmp_table_size 108003328
tmpdir C:\WINDOWS\TEMP\
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
version 4.0.25-debug-log
version_comment Official MySQL binary
version_compile_os Win32
wait_timeout 28800
Here are the settings from my SHOW STATUS; The server was rebooted last
night:
query result ( 133 records )
Variable_name Value
Aborted_clients 38
Aborted_connects 0
Bytes_received 1581180041
Bytes_sent 759308829
Com_admin_commands 1
Com_alter_table 12
Com_analyze 0
Com_backup_table 0
Com_begin 0
Com_change_db 199443
Com_change_master 0
Com_check 0
Com_commit 0
Com_create_db 0
Com_create_function 0
Com_create_index 0
Com_create_table 6
Com_delete 198582
Com_delete_multi 0
Com_drop_db 0
Com_drop_function 0
Com_drop_index 0
Com_drop_table 6
Com_flush 0
Com_grant 0
Com_ha_close 0
Com_ha_open 0
Com_ha_read 0
Com_insert 270685
Com_insert_select 6
Com_kill 0
Com_load 0
Com_load_master_data 0
Com_load_master_table 0
Com_lock_tables 0
Com_optimize 0
Com_purge 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_rollback 0
Com_savepoint 0
Com_select 7562775
Com_set_option 0
Com_show_binlog_events 0
Com_show_binlogs 0
Com_show_create 0
Com_show_databases 3
Com_show_fields 448
Com_show_grants 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_processlist 0
Com_show_slave_hosts 1
Com_show_slave_status 0
Com_show_status 2
Com_show_innodb_status 0
Com_show_tables 822
Com_show_variables 3
Com_slave_start 0
Com_slave_stop 0
Com_truncate 0
Com_unlock_tables 0
Com_update 148859
Com_update_multi 0
Connections 25056
Created_tmp_disk_tables 14297
Created_tmp_tables 47789
Created_tmp_files 1505
Delayed_insert_threads 0
Delayed_writes 0
Delayed_errors 0
Flush_commands 1
Handler_commit 0
Handler_delete 203212
Handler_read_first 1634
Handler_read_key 119597882
Handler_read_next 385473718
Handler_read_prev 192056
Handler_read_rnd 240959228
Handler_read_rnd_next 179152782
Handler_rollback 0
Handler_update 245049083
Handler_write 233387494
Key_blocks_used 373653
Key_read_requests 813389205
Key_reads 362072
Key_write_requests 2227702
Key_writes 1563640
Max_used_connections 45
Not_flushed_key_blocks 0
Not_flushed_delayed_rows 0
Open_tables 76
Open_files 125
Open_streams 0
Opened_tables 3226
Questions 13246292
Qcache_queries_in_cache 13925
Qcache_inserts 7018431
Qcache_hits 4839559
Qcache_lowmem_prunes 4796337
Qcache_not_cached 544344
Qcache_free_memory 17765096
Qcache_free_blocks 5342
Qcache_total_blocks 33291
Rpl_status NULL
Select_full_join 11740
Select_full_range_join 10
Select_range 12863
Select_range_check 0
Select_scan 117665
Slave_open_temp_tables 0
Slave_running OFF
Slow_launch_threads 0
Slow_queries 89
Sort_merge_passes 1046
Sort_range 257693
Sort_rows 18264167
Sort_scan 80339
Table_locks_immediate 8913947
Table_locks_waited 27323
Threads_cached 0
Threads_created 25055
Threads_connected 4
Threads_running 4
Uptime 58588
