8.9.2 Tuning Server Parameters
You can determine the default buffer sizes used by the mysqld server using this command:
shell> mysqld --verbose --help
This command produces a list of all mysqld options and configurable system variables. The output includes the default variable values and looks something like this:
help TRUE
abort-slave-event-count 0
allow-suspicious-udfs FALSE
auto-increment-increment 1
auto-increment-offset 1
automatic-sp-privileges TRUE
basedir /home/jon/bin/mysql-5.0/
bdb FALSE
bind-address (No default value)
character-set-client-handshake TRUE
character-set-filesystem binary
character-set-server latin1
character-sets-dir /home/jon/bin/mysql-5.0/share/mysql/charsets/
chroot (No default value)
collation-server latin1_swedish_ci
completion-type 0
concurrent-insert 1
console FALSE
datadir /home/jon/bin/mysql-5.0/var/
default-character-set latin1
default-collation latin1_swedish_ci
default-time-zone (No default value)
disconnect-slave-event-count 0
enable-locking FALSE
enable-pstack FALSE
engine-condition-pushdown FALSE
external-locking FALSE
federated TRUE
gdb FALSE
large-pages FALSE
init-connect (No default value)
init-file (No default value)
init-slave (No default value)
innodb TRUE
innodb_checksums TRUE
innodb_data_home_dir (No default value)
innodb_adaptive_hash_index TRUE
innodb_doublewrite TRUE
innodb_fast_shutdown 1
innodb_file_per_table FALSE
innodb_flush_log_at_trx_commit 1
innodb_flush_method (No default value)
innodb_locks_unsafe_for_binlog FALSE
innodb_log_arch_dir (No default value)
innodb_log_group_home_dir (No default value)
innodb_max_dirty_pages_pct 90
innodb_max_purge_lag 0
innodb_rollback_on_timeout FALSE
innodb_status_file FALSE
innodb_support_xa TRUE
innodb_table_locks TRUE
isam FALSE
language /home/jon/bin/mysql-5.0/share/mysql/english/
lc-time-names en_US
local-infile TRUE
log (No default value)
log-bin (No default value)
log-bin-index (No default value)
log-bin-trust-function-creators FALSE
log-bin-trust-routine-creators FALSE
log-error
log-isam myisam.log
log-queries-not-using-indexes FALSE
log-short-format FALSE
log-slave-updates FALSE
log-slow-admin-statements FALSE
log-slow-queries (No default value)
log-tc tc.log
log-tc-size 24576
log-update (No default value)
log-warnings 1
low-priority-updates FALSE
master-connect-retry 60
master-host (No default value)
master-info-file master.info
master-password (No default value)
master-port 3306
master-retry-count 86400
master-ssl FALSE
master-ssl-ca (No default value)
master-ssl-capath (No default value)
master-ssl-cert (No default value)
master-ssl-cipher (No default value)
master-ssl-key (No default value)
master-user test
max-binlog-dump-events 0
memlock FALSE
merge TRUE
myisam-recover OFF
ndbcluster FALSE
new FALSE
old-passwords FALSE
old-style-user-limits FALSE
pid-file /home/jon/bin/mysql-5.0/var/tonfisk.pid
port 3306
port-open-timeout 0
relay-log (No default value)
relay-log-index (No default value)
relay-log-info-file relay-log.info
replicate-same-server-id FALSE
report-host (No default value)
report-password (No default value)
report-port 3306
report-user (No default value)
rpl-recovery-rank 0
safe-user-create FALSE
secure-auth FALSE
secure-file-priv (No default value)
server-id 0
show-slave-auth-info FALSE
skip-grant-tables FALSE
skip-slave-start FALSE
slave-load-tmpdir /tmp/
socket /tmp/mysql.sock
sporadic-binlog-dump-fail FALSE
sql-mode OFF
symbolic-links TRUE
sysdate-is-now FALSE
tc-heuristic-recover (No default value)
temp-pool TRUE
timed_mutexes FALSE
tmpdir (No default value)
use-symbolic-links TRUE
verbose TRUE
warnings 1
back_log 50
binlog_cache_size 32768
bulk_insert_buffer_size 8388608
connect_timeout 10
date_format (No default value)
datetime_format (No default value)
default_week_format 0
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
div_precision_increment 4
expire_logs_days 0
flush_time 0
ft_max_word_len 84
ft_min_word_len 4
ft_query_expansion_limit 20
ft_stopword_file (No default value)
group_concat_max_len 1024
innodb_additional_mem_pool_size 1048576
innodb_autoextend_increment 8
innodb_buffer_pool_awe_mem_mb 0
innodb_buffer_pool_size 8388608
innodb_commit_concurrency 0
innodb_concurrency_tickets 500
innodb_file_io_threads 4
innodb_force_recovery 0
innodb_lock_wait_timeout 50
innodb_log_buffer_size 1048576
innodb_log_file_size 5242880
innodb_log_files_in_group 2
innodb_mirrored_log_groups 1
innodb_open_files 300
innodb_sync_spin_loops 20
innodb_thread_concurrency 8
innodb_thread_sleep_delay 10000
interactive_timeout 28800
join_buffer_size 131072
keep_files_on_create FALSE
key_buffer_size 8384512
key_cache_age_threshold 300
key_cache_block_size 1024
key_cache_division_limit 100
long_query_time 10
lower_case_table_names 0
max_allowed_packet 1048576
max_binlog_cache_size 18446744073709547520
max_binlog_size 1073741824
max_connect_errors 10
max_connections 100
max_delayed_threads 20
max_error_count 64
max_heap_table_size 16777216
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
multi_range_count 256
myisam_block_size 1024
myisam_data_pointer_size 6
myisam_max_extra_sort_file_size 2147483648
myisam_max_sort_file_size 9223372036853727232
myisam_repair_threads 1
myisam_sort_buffer_size 8388608
myisam_stats_method nulls_unequal
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
open_files_limit 0
optimizer_prune_level 1
optimizer_search_depth 62
plugin_dir
preload_buffer_size 32768
query_alloc_block_size 8192
query_cache_limit 1048576
query_cache_min_res_unit 4096
query_cache_size 0
query_cache_type 1
query_cache_wlock_invalidate FALSE
query_prealloc_size 8192
range_alloc_block_size 4096
read_buffer_size 131072
read_only FALSE
read_rnd_buffer_size 262144
record_buffer 131072
relay_log_purge TRUE
relay_log_space_limit 0
slave_compressed_protocol FALSE
slave_net_timeout 3600
slave_transaction_retries 10
slow_launch_time 2
sort_buffer_size 2097144
sync-binlog 0
sync-frm TRUE
table_cache 64
table_lock_wait_timeout 50
thread_cache_size 0
thread_concurrency 10
thread_stack 262144
time_format (No default value)
tmp_table