Optimering/tuning af MySQL-server

Hej,

Vi har et velbesøgt site kørende (fresbd-apache-php-mysql), placeret på en server.

En gang imellem får vi dog en fejl ved "mysql_select_db", den kan ikke finde DB'en (og tro mig - den er der)

Jeg kan ikke umiddelbart se en løsning, men har dog læst mig frem til at mysql-serveren sandsynligvis er konfigureret forkert i forhold til den aktuelle belastning.

Jeg har derfor lavet et dump af "SHOW STATUS" og "SHOW VARIABLES".

Jeg håber at der er nogen derude, der kan komme med et bud....

/Findus

SHOW STATUS 
=================================
Variable_name  Value 
Aborted_clients 8
Aborted_connects 0
Bytes_received 95691247
Bytes_sent 169855427
Com_admin_commands 0
Com_alter_table 2
Com_analyze 0
Com_backup_table 0
Com_begin 0
Com_change_db 458788
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 0
Com_delete 58
Com_drop_db 0
Com_drop_function 0
Com_drop_index 0
Com_drop_table 0
Com_flush 1
Com_grant 0
Com_insert 7476
Com_insert_select 0
Com_kill 0
Com_load 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_select 565599
Com_set_option 0
Com_show_binlogs 0
Com_show_create 0
Com_show_databases 30
Com_show_fields 43
Com_show_grants 0
Com_show_keys 8
Com_show_logs 0
Com_show_master_stat 0
Com_show_open_tables 0
Com_show_processlist 1
Com_show_slave_stat 0
Com_show_status 14006
Com_show_tables 426
Com_show_variables 10
Com_slave_start 0
Com_slave_stop 0
Com_truncate 0
Com_unlock_tables 0
Com_update 2577
Connections 462090
Created_tmp_disk_tables 123596
Created_tmp_tables 232879
Created_tmp_files 0
Delayed_insert_threads 0
Delayed_writes 0
Delayed_errors 0
Flush_commands 1
Handler_delete 55
Handler_read_first 5355
Handler_read_key 856769
Handler_read_next 9
Handler_read_prev 0
Handler_read_rnd 182962
Handler_read_rnd_next 82556524
Handler_update 455092
Handler_write 378428
Key_blocks_used 617
Key_read_requests 822951
Key_reads 555
Key_write_requests 8055
Key_writes 7980
Max_used_connections 23
Not_flushed_key_blocks 0
Not_flushed_delayed_rows 0
Open_tables 64
Open_files 126
Open_streams 0
Opened_tables 1742
Questions 1511195
Select_full_join 527
Select_full_range_join 0
Select_range 0
Select_range_check 0
Select_scan 162813
Slave_running OFF
Slave_open_temp_tables 0
Slow_launch_threads 0
Slow_queries 0
Sort_merge_passes 0
Sort_range 0
Sort_rows 182988
Sort_scan 153621
Table_locks_immediate 583497
Table_locks_waited 5
Threads_cached 0
Threads_created 462089
Threads_connected 3
Threads_running 1
Uptime 300305


SHOW VARIABLES 
=================================
Variable_name  Value 
back_log 50
basedir /usr/local/
bdb_cache_size 8388600
bdb_log_buffer_size 32768
bdb_home /home/mysql/
bdb_max_lock 10000
bdb_logdir 
bdb_shared_data OFF
bdb_tmpdir /var/tmp/
bdb_version Sleepycat Software: Berkeley DB 3.2.9a: (February 14, 2002)
binlog_cache_size 32768
character_set latin1
character_sets latin1 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
datadir /home/mysql/
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
flush OFF
flush_time 0
have_bdb YES
have_gemini NO
have_innodb DISABLED
have_isam YES
have_raid NO
have_openssl NO
init_file 
innodb_additional_mem_pool_size 1048576
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 OFF
innodb_fast_shutdown OFF
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
interactive_timeout 28800
join_buffer_size 131072
key_buffer_size 8388600
language /usr/local/share/mysql/english/
large_files_support ON
log OFF
log_update OFF
log_bin OFF
log_slave_updates OFF
log_long_queries OFF
long_query_time 10
low_priority_updates OFF
lower_case_table_names 0
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_heap_table_size 16777216
max_join_size 4294967295
max_sort_length 1024
max_user_connections 0
max_tmp_tables 32
max_write_lock_count 4294967295
myisam_max_extra_sort_file_size 256
myisam_max_sort_file_size 2047
myisam_recover_options 0
myisam_sort_buffer_size 8388608
net_buffer_length 16384
net_read_timeout 30
net_retry_count 1000000
net_write_timeout 60
open_files_limit 0
pid_file /home/mysql/thissite.pid
port 3306
protocol_version 10
record_buffer 131072
record_rnd_buffer 131072
query_buffer_size 0
safe_show_database OFF
server_id 0
slave_net_timeout 3600
skip_locking OFF
skip_networking OFF
skip_show_database OFF
slow_launch_time 2
socket /tmp/mysql.sock
sort_buffer 2097144
sql_mode 0
table_cache 64
table_type MYISAM
thread_cache_size 0
thread_stack 65536
transaction_isolation READ-COMMITTED
timezone CEST
tmp_table_size 33554432
tmpdir /var/tmp/
version 3.23.49
wait_timeout 28800