There are two ways by which you can view your existing MySQL configurations . The first one is to view your my.cnf file. The second way is by login to mysql and type show variables

mysql> show variables;
+---------------------------------+------------------------------------------+
| Variable_name                   | Value                                    |
+---------------------------------+------------------------------------------+
| auto_increment_increment        | 1                                        |
| auto_increment_offset           | 1                                        |
| automatic_sp_privileges         | ON                                       |
| back_log                        | 50                                       |
| basedir                         | /                                        |
| binlog_cache_size               | 32768                                    |
| bulk_insert_buffer_size         | 8388608                                  |
| character_set_client            | latin1                                   |
| character_set_connection        | latin1                                   |
| character_set_database          | latin1                                   |
| character_set_filesystem        | binary                                   |
| character_set_results           | latin1                                   |
| character_set_server            | latin1                                   |
| character_set_system            | utf8                                     |
| character_sets_dir              | /usr/share/mysql/charsets/               |
| collation_connection            | latin1_swedish_ci                        |
| collation_database              | latin1_swedish_ci                        |
| collation_server                | latin1_swedish_ci                        |
| completion_type                 | 0                                        |
| concurrent_insert               | 1                                        |
| connect_timeout                 | 15                                       |
| datadir                         | /var/lib/mysql/                          |
| 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                                        |
| keep_files_on_create            | OFF                                      |
| engine_condition_pushdown       | OFF                                      |
| expire_logs_days                | 0                                        |
| flush                           | OFF                                      |
| flush_time                      | 0                                        |
| ft_boolean_syntax               | + -><()~*:""&|                           |
| ft_max_word_len                 | 84                                       |
| ft_min_word_len                 | 4                                        |
| ft_query_expansion_limit        | 20                                       |
| ft_stopword_file                | (built-in)                               |
| group_concat_max_len            | 1024                                     |
| have_archive                    | YES                                      |
| have_bdb                        | NO                                       |
| have_blackhole_engine           | YES                                      |
| have_compress                   | YES                                      |
| have_crypt                      | YES                                      |
| have_csv                        | YES                                      |
| have_dynamic_loading            | YES                                      |
| have_example_engine             | YES                                      |
| have_federated_engine           | YES                                      |
| have_geometry                   | YES                                      |
| have_innodb                     | YES                                      |
| have_isam                       | NO                                       |
| have_merge_engine               | YES                                      |
| have_ndbcluster                 | NO                                       |
| have_openssl                    | DISABLED                                 |
| have_ssl                        | DISABLED                                 |
| have_query_cache                | YES                                      |
| have_raid                       | NO                                       |
| have_rtree_keys                 | YES                                      |
| have_symlink                    | YES                                      |
| hostname                        | localhost.localdomain                    |
| init_connect                    |                                          |
| init_file                       |                                          |
| init_slave                      |                                          |
| innodb_additional_mem_pool_size | 1048576                                  |
| innodb_autoextend_increment     | 8                                        |
| innodb_buffer_pool_awe_mem_mb   | 0                                        |
| innodb_buffer_pool_size         | 8388608                                  |
| innodb_checksums                | ON                                       |
| innodb_commit_concurrency       | 0                                        |
| innodb_concurrency_tickets      | 500                                      |
| innodb_data_file_path           | ibdata1:10M:autoextend                   |
| innodb_data_home_dir            |                                          |
| innodb_doublewrite              | ON                                       |
| innodb_fast_shutdown            | 1                                        |
| innodb_file_io_threads          | 4                                        |
| innodb_file_per_table           | OFF                                      |
| innodb_flush_log_at_trx_commit  | 1                                        |
| innodb_flush_method             |                                          |
| innodb_force_recovery           | 0                                        |
| innodb_lock_wait_timeout        | 50                                       |
| innodb_locks_unsafe_for_binlog  | OFF                                      |
| 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_max_dirty_pages_pct      | 90                                       |
| innodb_max_purge_lag            | 0                                        |
| innodb_mirrored_log_groups      | 1                                        |
| innodb_open_files               | 300                                      |
| innodb_rollback_on_timeout      | OFF                                      |
| innodb_support_xa               | ON                                       |
| innodb_sync_spin_loops          | 20                                       |
| innodb_table_locks              | ON                                       |
| innodb_thread_concurrency       | 8                                        |
| innodb_thread_sleep_delay       | 10000                                    |
| interactive_timeout             | 28800                                    |
| join_buffer_size                | 131072                                   |
| key_buffer_size                 | 536870912                                |
| key_cache_age_threshold         | 300                                      |
| key_cache_block_size            | 1024                                     |
| key_cache_division_limit        | 100                                      |
| language                        | /usr/share/mysql/english/                |
| large_files_support             | ON                                       |
| large_page_size                 | 0                                        |
| large_pages                     | OFF                                      |
| lc_time_names                   | en_US                                    |
| license                         | GPL                                      |
| local_infile                    | ON                                       |
| locked_in_memory                | OFF                                      |
| log                             | OFF                                      |
| log_bin                         | ON                                       |
| log_bin_trust_function_creators | OFF                                      |
| log_error                       |                                          |
| log_queries_not_using_indexes   | OFF                                      |
| 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          | 0                                        |
| max_allowed_packet              | 1047552                                  |
| max_binlog_cache_size           | 4294967295                               |
| max_binlog_size                 | 1073741824                               |
| max_connect_errors              | 10                                       |
| max_connections                 | 1024                                     |
| 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               | 4294967295                               |
| max_sort_length                 | 1024                                     |
| max_sp_recursion_depth          | 0                                        |
| max_tmp_tables                  | 32                                       |
| max_user_connections            | 1024                                     |
| max_write_lock_count            | 4294967295                               |
| multi_range_count               | 256                                      |
| myisam_data_pointer_size        | 6                                        |
| myisam_max_sort_file_size       | 2147483647                               |
| myisam_recover_options          | OFF                                      |
| 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                                       |
| new                             | OFF                                      |
| old_passwords                   | OFF                                      |
| open_files_limit                | 5120                                     |
| optimizer_prune_level           | 1                                        |
| optimizer_search_depth          | 62                                       |
| pid_file                        | /var/lib/mysql/localhost.localdomain.pid |
| port                            | 3306                                     |
| preload_buffer_size             | 32768                                    |
| protocol_version                | 10                                       |
| query_alloc_block_size          | 8192                                     |
| query_cache_limit               | 1048576                                  |
| query_cache_min_res_unit        | 4096                                     |
| 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                | 3141632                                  |
| read_only                       | OFF                                      |
| read_rnd_buffer_size            | 16773120                                 |
| relay_log_purge                 | ON                                       |
| relay_log_space_limit           | 0                                        |
| 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_load_tmpdir               | /tmp/                                    |
| slave_net_timeout               | 3600                                     |
| slave_skip_errors               | OFF                                      |
| slave_transaction_retries       | 10                                       |
| slow_launch_time                | 2                                        |
| socket                          | /tmp/mysql.sock                          |
| sort_buffer_size                | 2097144                                  |
| sql_big_selects                 | ON                                       |
| sql_mode                        |                                          |
| sql_notes                       | ON                                       |
| sql_warnings                    | OFF                                      |
| ssl_ca                          |                                          |
| ssl_capath                      |                                          |
| ssl_cert                        |                                          |
| ssl_cipher                      |                                          |
| ssl_key                         |                                          |
| storage_engine                  | MyISAM                                   |
| sync_binlog                     | 0                                        |
| sync_frm                        | ON                                       |
| system_time_zone                | IST                                      |
| table_cache                     | 1024                                     |
| table_lock_wait_timeout         | 50                                       |
| table_type                      | MyISAM                                   |
| thread_cache_size               | 128                                      |
| thread_stack                    | 196608                                   |
| time_format                     | %H:%i:%s                                 |
| time_zone                       | SYSTEM                                   |
| timed_mutexes                   | OFF                                      |
| tmp_table_size                  | 536870912                                |
| tmpdir                          | /tmp/                                    |
| transaction_alloc_block_size    | 8192                                     |
| transaction_prealloc_size       | 4096                                     |
| tx_isolation                    | REPEATABLE-READ                          |
| updatable_views_with_limit      | YES                                      |
| version                         | 5.0.50sp1-enterprise-gpl-log             |
| version_comment                 | MySQL Enterprise Server (GPL)            |
| version_compile_machine         | i686                                     |
| version_compile_os              | redhat-linux-gnu                         |
| wait_timeout                    | 28800                                    |
+---------------------------------+------------------------------------------+
224 rows in set (0.01 sec)

The output of a my.cnf file

# Example MySQL config file for very large systems.
#
# This is for a large system with memory of 1G-2G where the system runs mainly
# MySQL.
#
# You can copy this file to
# /etc/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is /usr/local/mysql/var) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
#password	= your_password
port		= 3306
socket		= /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port		= 3306
socket		= /tmp/mysql.sock
skip-locking
query_cache_type = 1
query_cache_limit = 1M
query_cache_size = 32M
max_connections = 1024
max_user_connections = 1024
wait_timeout = 30
connect_timeout = 15
thread_cache_size = 128
table_cache = 1024
tmp_table_size = 512M
sort_buffer_size = 16M
read_buffer_size = 4M
read_rnd_buffer_size = 16M
key_buffer = 512M
sort_buffer = 2M
read_buffer = 3M
#write_buffer = 1M
max_allowed_packet = 1M

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id	= 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=, MASTER_PORT=
,
#    MASTER_USER=, MASTER_PASSWORD=
 ;
#
#    where you replace , ,
 by quoted strings and
#
 by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =

#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =

#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Point the following paths to different dedicated disks
#tmpdir		= /tmp/
#log-update 	= /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#bdb_cache_size = 384M
#bdb_max_lock = 100000

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /usr/local/mysql/var/
#innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend
#innodb_log_group_home_dir = /usr/local/mysql/var/
#innodb_log_arch_dir = /usr/local/mysql/var/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 384M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 100M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[isamchk]
key_buffer = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

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