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MySQL Error 2013 - Lost connection to MySQL Server


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When I try to query or access my local DB server I get the 2013 connection error 4 out of 5 times. I was hoping there was a way to debug where the problem lies.

So far my investigations show:

[blockquote]- This is a problem when i try using PHP, NaviCat and the mysql bin executables

- Upgrading from MySQL 4.0 (where the problem started) to 5.0 didnt help

- My connection timeout is very high (the default, its 8 days or something?)

- After I get the error if i check the server up-time it appears that the server has not been restarted [/blockquote]

Has anyone got any ideas on what could be happening, or what I can do to investigate further?

Thanks,

Jamie
The server starts fine, im running it on my Windows development machine. Performing NET START MYSQL has no problems.

As this is my development machine I am only ever accessing it from localhost

I have not tried changing the thread size. Which specific variable in my.ini should I alter?

Thanks for you help,

Jamie
Not really -- there are no errors anywhere other than this one? You should read [a href=\"http://dev.mysql.com/doc/refman/5.0/en/gone-away.html\" target=\"_blank\"]this refman page[/a], and probably [a href=\"http://dev.mysql.com/doc/refman/5.0/en/Can_not_connect_to_server.html\" target=\"_blank\"]this one too[/a]. Maybe you'll find something there. It's very strange that you can lose a connection to a local server! Good luck.
Just thought I'd pop my [b]MysqlAdmin variables[/b] up, in case they were any use:

[code]
+---------------------------------+---------------------------------+
| Variable_name                   | Value                           |
+---------------------------------+---------------------------------+
| back_log                        | 50                              |
| basedir                         | S:\MySQL Server\                |
| binlog_cache_size               | 32768                           |
| bulk_insert_buffer_size         | 8388608                         |
| character_set_client            | latin1                          |
| character_set_connection        | latin1                          |
| character_set_database          | latin1                          |
| character_set_results           | latin1                          |
| character_set_server            | latin1                          |
| character_set_system            | utf8                            |
| character_sets_dir              | S:\MySQL Server\share\charsets/ |
| collation_connection            | latin1_swedish_ci               |
| collation_database              | latin1_swedish_ci               |
| collation_server                | latin1_swedish_ci               |
| concurrent_insert               | ON                              |
| connect_timeout                 | 5                               |
| datadir                         | S:\MySQL Server\Data\           |
| 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                            |
| expire_logs_days                | 0                               |
| flush                           | OFF                             |
| flush_time                      | 1800                            |
| 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           | NO                              |
| have_compress                   | YES                             |
| have_crypt                      | NO                              |
| have_csv                        | NO                              |
| have_example_engine             | NO                              |
| have_geometry                   | YES                             |
| have_innodb                     | YES                             |
| have_isam                       | NO                              |
| have_ndbcluster                 | NO                              |
| have_openssl                    | NO                              |
| have_query_cache                | YES                             |
| have_raid                       | NO                              |
| have_rtree_keys                 | YES                             |
| have_symlink                    | NO                              |
| init_connect                    |                                 |
| init_file                       |                                 |
| init_slave                      |                                 |
| innodb_additional_mem_pool_size | 2097152                         |
| innodb_autoextend_increment     | 8                               |
| innodb_buffer_pool_awe_mem_mb   | 0                               |
| innodb_buffer_pool_size         | 8388608                         |
| innodb_data_file_path           | ibdata1:10M:autoextend          |
| innodb_data_home_dir            |                                 |
| innodb_fast_shutdown            | ON                              |
| 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            | 10485760                        |
| 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_table_locks              | ON                              |
| innodb_thread_concurrency       | 8                               |
| interactive_timeout             | 28800                           |
| join_buffer_size                | 131072                          |
| key_buffer_size                 | 8388608                         |
| key_cache_age_threshold         | 300                             |
| key_cache_block_size            | 1024                            |
| key_cache_division_limit        | 100                             |
| language                        | S:\MySQL Server\share\english\  |
| large_files_support             | ON                              |
| license                         | GPL                             |
| local_infile                    | ON                              |
| log                             | OFF                             |
| log_bin                         | OFF                             |
| log_error                       | .\jimbob.err                    |
| log_slave_updates               | OFF                             |
| log_slow_queries                | OFF                             |
| log_update                      | 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_connect_errors              | 10                              |
| max_connections                 | 100                             |
| max_delayed_threads             | 20                              |
| max_error_count                 | 64                              |
| max_heap_table_size             | 16777216                        |
| max_insert_delayed_threads      | 20                              |
| max_join_size                   | 4294967295                      |
| max_length_for_sort_data        | 1024                            |
| max_relay_log_size              | 0                               |
| max_seeks_for_key               | 4294967295                      |
| max_sort_length                 | 1024                            |
| max_tmp_tables                  | 32                              |
| max_user_connections            | 0                               |
| max_write_lock_count            | 4294967295                      |
| myisam_data_pointer_size        | 4                               |
| myisam_max_extra_sort_file_size | 107374182400                    |
| myisam_max_sort_file_size       | 107374182400                    |
| myisam_recover_options          | OFF                             |
| myisam_repair_threads           | 1                               |
| myisam_sort_buffer_size         | 8388608                         |
| myisam_stats_method             | nulls_unequal                   |
| named_pipe                      | OFF                             |
| net_buffer_length               | 16384                           |
| net_read_timeout                | 30                              |
| net_retry_count                 | 10                              |
| net_write_timeout               | 60                              |
| new                             | OFF                             |
| old_passwords                   | OFF                             |
| open_files_limit                | 622                             |
| pid_file                        | S:\MySQL Server\Data\jimbob.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                | 0                               |
| query_cache_type                | ON                              |
| query_cache_wlock_invalidate    | OFF                             |
| query_prealloc_size             | 8192                            |
| range_alloc_block_size          | 2048                            |
| read_buffer_size                | 61440                           |
| read_only                       | OFF                             |
| read_rnd_buffer_size            | 258048                          |
| relay_log_purge                 | ON                              |
| relay_log_space_limit           | 0                               |
| rpl_recovery_rank               | 0                               |
| secure_auth                     | OFF                             |
| shared_memory                   | OFF                             |
| shared_memory_base_name         | MYSQL                           |
| server_id                       | 0                               |
| skip_external_locking           | ON                              |
| skip_networking                 | OFF                             |
| skip_show_database              | OFF                             |
| slave_net_timeout               | 3600                            |
| slave_transaction_retries       | 0                               |
| slow_launch_time                | 2                               |
| sort_buffer_size                | 217080                          |
| sql_mode                        |                                 |
| sql_notes                       | ON                              |
| sql_warnings                    | ON                              |
| storage_engine                  | InnoDB                          |
| sync_binlog                     | 0                               |
| sync_frm                        | ON                              |
| sync_replication                | 0                               |
| sync_replication_slave_id       | 0                               |
| sync_replication_timeout        | 0                               |
| system_time_zone                | GMT Standard Time               |
| table_cache                     | 256                             |
| table_type                      | InnoDB                          |
| thread_cache_size               | 25                              |
| thread_stack                    | 262144                          |
| time_format                     | %H:%i:%s                        |
| time_zone                       | SYSTEM                          |
| tmp_table_size                  | 5242880                         |
| tmpdir                          |                                 |
| transaction_alloc_block_size    | 8192                            |
| transaction_prealloc_size       | 4096                            |
| tx_isolation                    | REPEATABLE-READ                 |
| version                         | 4.1.16-nt                       |
| version_comment                 | Official MySQL binary           |
| version_compile_machine         | ia32                            |
| version_compile_os              | Win32                           |
| wait_timeout                    | 28800                           |
+---------------------------------+---------------------------------+
[/code]

Regards,

Jamie
Perhaps I have found the problem, in phpMyAdmin I asked for a list of the variable and found:

connect timeout : 5
long query time : 10
wait timeout : 28800

Now the top two dont look very long compared to the third one! How would I go about changing these? As I cannot find them in my.ini

Thoughts?

Jamie
I wouldn't worry about the long query wait time -- 10 seconds is a very long query, and even so, this is just for logging, if enabled. If you want to change the connection_timeout, use the same type of syntax as I specified earlier (i.e. set-variable = ... ).

Good luck.
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