I stuck with problem, My database mysql server giving frequently error DB : connection fail
i tried almost all thing but then also in a day 10-12 time its give this error.
I had Separate database server than web server with 16 GB RAM server with high speed server
This is MY database server variable configuration,
Variable name Current value auto_increment_increment 1 auto_increment_offset 1 automatic_sp_privileges ON back_log 50 basedir /usr/ bdb_cache_size 8388600 bdb_home /lib/mysql/ bdb_log_buffer_size 1036288 bdb_logdir bdb_max_lock 10000 bdb_shared_data OFF bdb_tmpdir /tmp/ 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 10 datadir /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 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 NO have_bdb YES have_blackhole_engine NO have_compress YES have_crypt YES have_csv NO have_dynamic_loading YES have_example_engine NO have_federated_engine NO have_geometry YES have_innodb DISABLED have_isam NO have_merge_engine YES have_ndbcluster NO have_openssl DISABLED have_query_cache YES have_raid NO have_rtree_keys YES have_symlink YES 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 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_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 56623104 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 OFF log_bin_trust_function_creators OFF log_error log_queries_not_using_indexes OFF log_slave_updates OFF log_slow_queries OFF log_warnings 2 long_query_time 10 low_priority_updates OFF lower_case_file_system OFF lower_case_table_names 0 max_allowed_packet 16776192 max_binlog_cache_size 18446744073709551615 max_binlog_size 1073741824 max_connect_errors 10 max_connections 200 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 multi_range_count 256 myisam_data_pointer_size 6 myisam_max_sort_file_size 9223372036854775807 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 ON open_files_limit 4258 optimizer_prune_level 1 optimizer_search_depth 62 pid_file /var/run/mysqld/mysqld.pid port 1044 preload_buffer_size 32768 prepared_stmt_count 0 protocol_version 10 query_alloc_block_size 8192 query_cache_limit 1048576 query_cache_min_res_unit 4096 query_cache_size 209715200 query_cache_type ON query_cache_wlock_invalidate OFF query_prealloc_size 8192 range_alloc_block_size 2048 read_buffer_size 131072 read_only OFF read_rnd_buffer_size 262144 relay_log_purge ON relay_log_space_limit 0 rpl_recovery_rank 0 secure_auth OFF server_id 0 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 /var/lib/mysql/mysql.sock sort_buffer_size 28311544 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 PDT table_cache 2024 table_lock_wait_timeout 50 table_type MyISAM thread_cache_size 40 thread_stack 262144 time_format %H:%i:%s time_zone SYSTEM timed_mutexes OFF tmp_table_size 1048576000 tmpdir /tmp/ transaction_alloc_block_size 8192 transaction_prealloc_size 4096 tx_isolation REPEATABLE-READ updatable_views_with_limit YES version 5.0.27 version_bdb Sleepycat Software: Berkeley DB 4.1.24: (October 21, 2006) version_comment Source distribution version_compile_machine x86_64 version_compile_os redhat-linux-gnu wait_timeout 28800</pre>