[opencms-dev] MySQLNonTransientConnectionException - too many connections

HERNAN - TFSLA info at tfsla.com
Tue May 3 18:35:33 CEST 2011


TOO MANY OPEN FILES is a very common problem. The tricky part, is how to
change it. In a couple of linux distros, there is a bug causing TOMCAT to
ignore SO limit definitions. To solved this definitly change the tomcat
init.

On ubuntu for example, go to  /etc/init.d/tomcat6, locate the line 
JVM_TMP=/tmp/tomcat6-tmp and below add the following lines:
ulimit -Hn 8192
ulimit -Sn 8192

You should notice a better responsive system.


Paul-Inge Flakstad wrote:
> 
> Hi Hernan,
> 
> I used all of yesterday to dig deep in the config of all
> Tomat, Apache, MySQL and OpenCms. Experimented for a while, it
> worked better (today I started seeing "Too many files open"
> exceptions though).
> 
> After implementing the changes you suggested here, it seems
> everything is A LOT better - probably very much due to the
> key_buffer_size, which provided the major change after
> yesterday's experimenting.
> 
> I'll just have to wait and see if things are stable now.
> 
> Thank you so much for your help! :)
> 
> Best regards,
> Paul
> 
>> -----Original Message-----
>> From: opencms-dev-bounces at opencms.org
>> [mailto:opencms-dev-bounces at opencms.org] On Behalf Of HERNAN - TFSLA
>> Sent: 3. mai 2011 00:22
>> To: opencms-dev at opencms.org
>> Subject: Re: [opencms-dev]
>> MySQLNonTransientConnectionException - too many connections
>>
>>
>> If both JAVA and MYSQL are hunging at the same time, most
>> probably, you have
>> an issue with a process / coding rather than config.
>> Nevertheless, your
>> config is not a very happy one :)
>>
>> 1) First of all, you should probably enable SLOW QUERIES and
>> during the high
>> cpu usage show a process list on MYSQL (queries on execution).
>>
>> 2) if you are using MYISAM table format, adjust the
>> KEY_BUFFER_SIZE value to
>> 4gb (1/3 of the total ram). If you are using INNODB, do that for
>> INNODB_BUFFER_POOL_SIZE.
>>
>> 3) change your TABLE_CACHE to something like 512,
>> thread_cache to 32 and
>> change max_tmp_tables to 128mb.
>>
>> 4) change max_connections to something like 200. There is no
>> reason to put
>> it on 2000 for a small site.
>>
>> 5) change MAX_ACTIVE on the opencms.properties to 200 (it should be
>> sufficient with 25 for small sites, but it depends on a lot
>> of factors such
>> as connection types, cycling, session duration, etc).
>>
>> 6) on my.cnf add the following line: --skip-name-resolve
>>
>> I'm also assuming your flexcache configuration is in place
>> for every major
>> JSP and you have an Apache cache / content expiration strategy.
>>
>> Please, change all on we continue from there. If the problem
>> presents itself
>> again, please post the SHOW PROCESS LIST and slow queries results.
>>
>>
>> Paul-Inge Flakstad wrote:
>> >
>> > Hi,
>> >
>> > Thanks for the help, I appreciate it very much!
>> >
>> > Our server admin says Java and MySQL are both at 100% CPU
>> when the system
>> > hangs.
>> >
>> > The box is a new dual-core with 16GB RAM.
>> >
>> > Here's the config (I removed some irrelevant parts):
>> >
>> >
>> > The connector is AJP 1.3 - defined in server.xml:
>> > <Connector port="8009" emptySessionPath="true" protocol="AJP/1.3"
>> > URIEncoding="utf-8" />
>> >
>> >
>> > opencms.properties
>> > ------------------
>> > #
>> > # Configuration of the driver manager
>> >
>> ##############################################################
>> ###################
>> > driver.vfs=db
>> > driver.project=db
>> > driver.user=db
>> > driver.history=db
>> >
>> > #
>> > # Declaration of database pools
>> >
>> ##############################################################
>> ###################
>> > db.pools=default
>> >
>> > #
>> > # Configuration of the default database pool
>> >
>> ##############################################################
>> ###################
>> > # name of the JDBC driver
>> > db.pool.default.jdbcDriver=org.gjt.mm.mysql.Driver
>> >
>> > # URL of the JDBC driver
>> > db.pool.default.jdbcUrl=jdbc:mysql://localhost:3306/npcms
>> >
>> > # optional parameters for the URL of the JDBC driver
>> > db.pool.default.jdbcUrl.params=?characterEncoding\=UTF-8
>> >
>> > # user name to connect to the database
>> > db.pool.default.user=xxxxxxxxx
>> >
>> > # password to connect to the database
>> > db.pool.default.password=xxxxxxxxxx
>> >
>> > # the URL to make the JDBC DriverManager return connections
>> from the DBCP
>> > pool
>> > db.pool.default.poolUrl=opencms:default
>> >
>> > # the maximum number of objects that can be borrowed from the pool
>> > db.pool.default.maxActive=25
>> >
>> > # the maximum amount of time before throwing an exception
>> when the pool is
>> > exhausted
>> > db.pool.default.maxWait=2000
>> >
>> > # the minimum number of objects that will kept connected
>> > db.pool.default.minIdle=3
>> >
>> > # the maximum number of objects that can sit idled in the pool
>> > db.pool.default.maxIdle=10
>> >
>> > # action to take when the pool is exhausted {grow|block|fail}
>> > db.pool.default.whenExhaustedAction=grow
>> >
>> > # connections will be validated before they are borrowed
>> from the pool
>> > db.pool.default.testOnBorrow=false
>> >
>> > # connections will be validated by evictor thread
>> > db.pool.default.testWhileIdle=true
>> >
>> > # number of milliseconds to sleep between runs of the evictor thread
>> > # -1 means no idle connection evictor thread will be run
>> > db.pool.default.timeBetweenEvictionRuns=3600000
>> >
>> > # number of connections tested in a run of the evictor thread
>> > db.pool.default.numTestsPerEvictionRun=3
>> >
>> > # minimum amount of time in milliseconds a connection may
>> be idle in the
>> > pool before it is eligable for eviction
>> > db.pool.default.minEvictableIdleTime=1800000
>> >
>> > # the query to validate connections
>> > db.pool.default.testQuery=SELECT STRUCTURE_ID FROM
>> CMS_OFFLINE_STRUCTURE
>> > WHERE RESOURCE_PATH = '/'
>> > #db.pool.default.testQuery=
>> >
>> > # number of attempts to connect to the database during
>> startup (default =
>> > 10)
>> > db.pool.default.connects=10
>> >
>> > # sleep time between two attempts to connect to the database during
>> > startup in ms (default = 5000)
>> > db.pool.default.wait=5000
>> >
>> > #
>> > # Configuration for statement pooling
>> >
>> ##############################################################
>> ###################
>> > db.statements.default.pooling=true
>> > db.statements.default.maxActive=200
>> > db.statements.default.maxWait=2000
>> > db.statements.default.maxIdle=100
>> > db.statements.default.whenExhaustedAction=block
>> >
>> > #
>> > # Configuration of the database driver manager
>> >
>> ##############################################################
>> ###################
>> > db.name=mysql_41
>> >
>> > db.vfs.driver=org.opencms.db.mysql.CmsVfsDriver
>> > db.vfs.pool=opencms:default
>> > db.vfs.sqlmanager=org.opencms.db.mysql.CmsSqlManager
>> >
>> > db.project.driver=org.opencms.db.mysql.CmsProjectDriver
>> > db.project.pool=opencms:default
>> > db.project.sqlmanager=org.opencms.db.mysql.CmsSqlManager
>> >
>> > db.user.driver=org.opencms.db.mysql.CmsUserDriver
>> > db.user.pool=opencms:default
>> > db.user.sqlmanager=org.opencms.db.mysql.CmsSqlManager
>> >
>> > db.history.driver=org.opencms.db.mysql.CmsHistoryDriver
>> > db.history.pool=opencms:default
>> > db.history.sqlmanager=org.opencms.db.mysql.CmsSqlManager
>> >
>> > db.cos.pool=opencms:default
>> > #
>> > # End of opencms.properties
>> >
>> ##############################################################
>> ###################
>> >
>> >
>> > mysql> show variables;
>> >
>> +---------------------------------+---------------------------
>> ---------------------------------+
>> > | Variable_name                   | Value
>>
>> > |
>> >
>> +---------------------------------+---------------------------
>> ---------------------------------+
>> > | auto_increment_increment        | 1
>>
>> > |
>> > | auto_increment_offset           | 1
>>
>> > |
>> > | automatic_sp_privileges         | ON
>>
>> > |
>> > | back_log                        | 50
>>
>> > |
>> > | basedir                         | /usr/
>>
>> > |
>> > | bdb_cache_size                  | 8384512
>>
>> > |
>> > | bdb_home                        | /var/lib/mysql/
>>
>> > |
>> > | bdb_log_buffer_size             | 262144
>>
>> > |
>> > | bdb_logdir                      |
>>
>> > |
>> > | bdb_max_lock                    | 10000
>>
>> > |
>> > | bdb_shared_data                 | OFF
>>
>> > |
>> > | bdb_tmpdir                      | /tmp/
>>
>> > |
>> > | binlog_cache_size               | 32768
>>
>> > |
>> > | bulk_insert_buffer_size         | 8388608
>>
>> > |
>> > | completion_type                 | 0
>>
>> > |
>> > | concurrent_insert               | 1
>>
>> > |
>> > | connect_timeout                 | 10
>>
>> > |
>> > | 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                    | 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                     | 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
>>
>> > |
>> > | 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_adaptive_hash_index      | ON
>>
>> > |
>> > | 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                 | 8384512
>>
>> > |
>> > | key_cache_age_threshold         | 300
>>
>> > |
>> > | key_cache_block_size            | 1024
>>
>> > |
>> > | key_cache_division_limit        | 100
>>
>> > |
>> > | large_files_support             | ON
>>
>> > |
>> > | large_page_size                 | 0
>>
>> > |
>> > | large_pages                     | OFF
>>
>> > |
>> > | 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                    | 1
>>
>> > |
>> > | long_query_time                 | 10
>>
>> > |
>> > | low_priority_updates            | OFF
>>
>> > |
>> > | lower_case_file_system          | OFF
>>
>> > |
>> > | lower_case_table_names          | 0
>>
>> > |
>> > | max_allowed_packet              | 67108864
>>
>> > |
>> > | max_binlog_cache_size           | 18446744073709547520
>>
>> > |
>> > | max_binlog_size                 | 1073741824
>>
>> > |
>> > | max_connect_errors              | 10
>>
>> > |
>> > | max_connections                 | 2048
>>
>> > |
>> > | 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       | 9223372036853727232
>>
>> > |
>> > | 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                | 10240
>>
>> > |
>> > | optimizer_prune_level           | 1
>>
>> > |
>> > | optimizer_search_depth          | 62
>>
>> > |
>> > | pid_file                        |
>> /var/run/mysqld/mysqld.pid
>> > |
>> > | plugin_dir                      |
>>
>> > |
>> > | port                            | 3306
>>
>> > |
>> > | preload_buffer_size             | 32768
>>
>> > |
>> > | profiling                       | OFF
>>
>> > |
>> > | profiling_history_size          | 15
>>
>> > |
>> > | 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          | 4096
>>
>> > |
>> > | read_buffer_size                | 131072
>>
>> > |
>> > | read_only                       | OFF
>>
>> > |
>> > | read_rnd_buffer_size            | 262144
>>
>> > |
>> > | relay_log                       |
>>
>> > |
>> > | relay_log_index                 |
>>
>> > |
>> > | relay_log_info_file             | relay-log.info
>>
>> > |
>> > | relay_log_purge                 | ON
>>
>> > |
>> > | relay_log_space_limit           | 0
>>
>> > |
>> > | rpl_recovery_rank               | 0
>>
>> > |
>> > | secure_auth                     | OFF
>>
>> > |
>> > | secure_file_priv                |
>>
>> > |
>> > | 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                | 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
>>
>> > |
>> > | table_cache                     | 64
>>
>> > |
>> > | table_lock_wait_timeout         | 50
>>
>> > |
>> > | table_type                      | MyISAM
>>
>> > |
>> > | thread_cache_size               | 0
>>
>> > |
>> > | thread_stack                    | 262144
>>
>> > |
>> > | timed_mutexes                   | OFF
>>
>> > |
>> > | tmp_table_size                  | 33554432
>>
>> > |
>> > | transaction_alloc_block_size    | 8192
>>
>> > |
>> > | transaction_prealloc_size       | 4096
>>
>> > |
>> > | tx_isolation                    | REPEATABLE-READ
>>
>> > |
>> > | updatable_views_with_limit      | YES
>>
>> > |
>> > | wait_timeout                    | 28800
>>
>> > |
>> >
>> +---------------------------------+---------------------------
>> ---------------------------------+
>> >
>> >
>> > mysql> show status;
>> > +-----------------------------------+-----------+
>> > | Variable_name                     | Value     |
>> > +-----------------------------------+-----------+
>> > | Aborted_clients                   | 34        |
>> > | Aborted_connects                  | 1         |
>> > | Binlog_cache_disk_use             | 0         |
>> > | Binlog_cache_use                  | 0         |
>> > | Bytes_received                    | 128       |
>> > | Bytes_sent                        | 162       |
>> > | Com_admin_commands                | 0         |
>> > | Com_alter_db                      | 0         |
>> > | Com_alter_table                   | 0         |
>> > | Com_analyze                       | 0         |
>> > | Com_backup_table                  | 0         |
>> > | Com_begin                         | 0         |
>> > | Com_call_procedure                | 0         |
>> > | Com_change_db                     | 0         |
>> > | Com_change_master                 | 0         |
>> > | Com_check                         | 0         |
>> > | Com_checksum                      | 0         |
>> > | Com_commit                        | 0         |
>> > | Com_create_db                     | 0         |
>> > | Com_create_function               | 0         |
>> > | Com_create_index                  | 0         |
>> > | Com_create_table                  | 0         |
>> > | Com_create_user                   | 0         |
>> > | Com_dealloc_sql                   | 0         |
>> > | Com_delete                        | 0         |
>> > | Com_delete_multi                  | 0         |
>> > | Com_do                            | 0         |
>> > | Com_drop_db                       | 0         |
>> > | Com_drop_function                 | 0         |
>> > | Com_drop_index                    | 0         |
>> > | Com_drop_table                    | 0         |
>> > | Com_drop_user                     | 0         |
>> > | Com_execute_sql                   | 0         |
>> > | Com_flush                         | 0         |
>> > | Com_grant                         | 0         |
>> > | Com_ha_close                      | 0         |
>> > | Com_ha_open                       | 0         |
>> > | Com_ha_read                       | 0         |
>> > | Com_help                          | 0         |
>> > | Com_insert                        | 0         |
>> > | Com_insert_select                 | 0         |
>> > | Com_kill                          | 0         |
>> > | Com_load                          | 0         |
>> > | Com_load_master_data              | 0         |
>> > | Com_load_master_table             | 0         |
>> > | Com_lock_tables                   | 0         |
>> > | Com_optimize                      | 0         |
>> > | Com_preload_keys                  | 0         |
>> > | Com_prepare_sql                   | 0         |
>> > | Com_purge                         | 0         |
>> > | Com_purge_before_date             | 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_revoke_all                    | 0         |
>> > | Com_rollback                      | 0         |
>> > | Com_savepoint                     | 0         |
>> > | Com_select                        | 1         |
>> > | Com_set_option                    | 0         |
>> > | Com_show_binlog_events            | 0         |
>> > | Com_show_binlogs                  | 0         |
>> > | Com_show_charsets                 | 0         |
>> > | Com_show_collations               | 0         |
>> > | Com_show_column_types             | 0         |
>> > | Com_show_create_db                | 0         |
>> > | Com_show_create_table             | 0         |
>> > | Com_show_databases                | 0         |
>> > | Com_show_errors                   | 0         |
>> > | Com_show_fields                   | 0         |
>> > | Com_show_grants                   | 0         |
>> > | Com_show_innodb_status            | 0         |
>> > | Com_show_keys                     | 0         |
>> > | Com_show_logs                     | 0         |
>> > | Com_show_master_status            | 0         |
>> > | Com_show_ndb_status               | 0         |
>> > | Com_show_new_master               | 0         |
>> > | Com_show_open_tables              | 0         |
>> > | Com_show_privileges               | 0         |
>> > | Com_show_processlist              | 0         |
>> > | Com_show_slave_hosts              | 0         |
>> > | Com_show_slave_status             | 0         |
>> > | Com_show_status                   | 1         |
>> > | Com_show_storage_engines          | 0         |
>> > | Com_show_tables                   | 0         |
>> > | Com_show_triggers                 | 0         |
>> > | Com_show_variables                | 0         |
>> > | Com_show_warnings                 | 0         |
>> > | Com_slave_start                   | 0         |
>> > | Com_slave_stop                    | 0         |
>> > | Com_stmt_close                    | 0         |
>> > | Com_stmt_execute                  | 0         |
>> > | Com_stmt_fetch                    | 0         |
>> > | Com_stmt_prepare                  | 0         |
>> > | Com_stmt_reset                    | 0         |
>> > | Com_stmt_send_long_data           | 0         |
>> > | Com_truncate                      | 0         |
>> > | Com_unlock_tables                 | 0         |
>> > | Com_update                        | 0         |
>> > | Com_update_multi                  | 0         |
>> > | Com_xa_commit                     | 0         |
>> > | Com_xa_end                        | 0         |
>> > | Com_xa_prepare                    | 0         |
>> > | Com_xa_recover                    | 0         |
>> > | Com_xa_rollback                   | 0         |
>> > | Com_xa_start                      | 0         |
>> > | Compression                       | OFF       |
>> > | Connections                       | 942289    |
>> > | Created_tmp_disk_tables           | 0         |
>> > | Created_tmp_files                 | 93        |
>> > | Created_tmp_tables                | 1         |
>> > | Delayed_errors                    | 0         |
>> > | Delayed_insert_threads            | 0         |
>> > | Delayed_writes                    | 0         |
>> > | Flush_commands                    | 1         |
>> > | Handler_commit                    | 0         |
>> > | Handler_delete                    | 0         |
>> > | Handler_discover                  | 0         |
>> > | Handler_prepare                   | 0         |
>> > | Handler_read_first                | 0         |
>> > | Handler_read_key                  | 0         |
>> > | Handler_read_next                 | 0         |
>> > | Handler_read_prev                 | 0         |
>> > | Handler_read_rnd                  | 0         |
>> > | Handler_read_rnd_next             | 0         |
>> > | Handler_rollback                  | 0         |
>> > | Handler_savepoint                 | 0         |
>> > | Handler_savepoint_rollback        | 0         |
>> > | Handler_update                    | 0         |
>> > | Handler_write                     | 132       |
>> > | Innodb_buffer_pool_pages_data     | 25        |
>> > | Innodb_buffer_pool_pages_dirty    | 0         |
>> > | Innodb_buffer_pool_pages_flushed  | 1         |
>> > | Innodb_buffer_pool_pages_free     | 487       |
>> > | Innodb_buffer_pool_pages_misc     | 0         |
>> > | Innodb_buffer_pool_pages_total    | 512       |
>> > | Innodb_buffer_pool_read_ahead_rnd | 1         |
>> > | Innodb_buffer_pool_read_ahead_seq | 0         |
>> > | Innodb_buffer_pool_read_requests  | 560       |
>> > | Innodb_buffer_pool_reads          | 18        |
>> > | Innodb_buffer_pool_wait_free      | 0         |
>> > | Innodb_buffer_pool_write_requests | 1         |
>> > | Innodb_data_fsyncs                | 7         |
>> > | Innodb_data_pending_fsyncs        | 0         |
>> > | Innodb_data_pending_reads         | 0         |
>> > | Innodb_data_pending_writes        | 0         |
>> > | Innodb_data_read                  | 2592768   |
>> > | Innodb_data_reads                 | 31        |
>> > | Innodb_data_writes                | 7         |
>> > | Innodb_data_written               | 35328     |
>> > | Innodb_dblwr_pages_written        | 1         |
>> > | Innodb_dblwr_writes               | 1         |
>> > | Innodb_log_waits                  | 0         |
>> > | Innodb_log_write_requests         | 0         |
>> > | Innodb_log_writes                 | 2         |
>> > | Innodb_os_log_fsyncs              | 5         |
>> > | Innodb_os_log_pending_fsyncs      | 0         |
>> > | Innodb_os_log_pending_writes      | 0         |
>> > | Innodb_os_log_written             | 1024      |
>> > | Innodb_page_size                  | 16384     |
>> > | Innodb_pages_created              | 0         |
>> > | Innodb_pages_read                 | 25        |
>> > | Innodb_pages_written              | 1         |
>> > | Innodb_row_lock_current_waits     | 0         |
>> > | Innodb_row_lock_time              | 0         |
>> > | Innodb_row_lock_time_avg          | 0         |
>> > | Innodb_row_lock_time_max          | 0         |
>> > | Innodb_row_lock_waits             | 0         |
>> > | Innodb_rows_deleted               | 0         |
>> > | Innodb_rows_inserted              | 0         |
>> > | Innodb_rows_read                  | 25        |
>> > | Innodb_rows_updated               | 0         |
>> > | Key_blocks_not_flushed            | 0         |
>> > | Key_blocks_unused                 | 4158      |
>> > | Key_blocks_used                   | 6694      |
>> > | Key_read_requests                 | 696459654 |
>> > | Key_reads                         | 1824563   |
>> > | Key_write_requests                | 4009303   |
>> > | Key_writes                        | 118979    |
>> > | Last_query_cost                   | 0.000000  |
>> > | Max_used_connections              | 166       |
>> > | Not_flushed_delayed_rows          | 0         |
>> > | Open_files                        | 69        |
>> > | Open_streams                      | 0         |
>> > | Open_tables                       | 64        |
>> > | Opened_tables                     | 0         |
>> > | Prepared_stmt_count               | 0         |
>> > | Qcache_free_blocks                | 0         |
>> > | Qcache_free_memory                | 0         |
>> > | Qcache_hits                       | 0         |
>> > | Qcache_inserts                    | 0         |
>> > | Qcache_lowmem_prunes              | 0         |
>> > | Qcache_not_cached                 | 0         |
>> > | Qcache_queries_in_cache           | 0         |
>> > | Qcache_total_blocks               | 0         |
>> > | Queries                           | 24309937  |
>> > | Questions                         | 2         |
>> > | Rpl_status                        | NULL      |
>> > | Select_full_join                  | 0         |
>> > | Select_full_range_join            | 0         |
>> > | Select_range                      | 0         |
>> > | Select_range_check                | 0         |
>> > | Select_scan                       | 1         |
>> > | Slave_open_temp_tables            | 0         |
>> > | Slave_retried_transactions        | 0         |
>> > | Slave_running                     | OFF       |
>> > | Slow_launch_threads               | 0         |
>> > | Slow_queries                      | 0         |
>> > | Sort_merge_passes                 | 0         |
>> > | Sort_range                        | 0         |
>> > | Sort_rows                         | 0         |
>> > | Sort_scan                         | 0         |
>> > | Ssl_accept_renegotiates           | 0         |
>> > | Ssl_accepts                       | 0         |
>> > | Ssl_callback_cache_hits           | 0         |
>> > | Ssl_cipher                        |           |
>> > | Ssl_cipher_list                   |           |
>> > | Ssl_client_connects               | 0         |
>> > | Ssl_connect_renegotiates          | 0         |
>> > | Ssl_ctx_verify_depth              | 0         |
>> > | Ssl_ctx_verify_mode               | 0         |
>> > | Ssl_default_timeout               | 0         |
>> > | Ssl_finished_accepts              | 0         |
>> > | Ssl_finished_connects             | 0         |
>> > | Ssl_session_cache_hits            | 0         |
>> > | Ssl_session_cache_misses          | 0         |
>> > | Ssl_session_cache_mode            | NONE      |
>> > | Ssl_session_cache_overflows       | 0         |
>> > | Ssl_session_cache_size            | 0         |
>> > | Ssl_session_cache_timeouts        | 0         |
>> > | Ssl_sessions_reused               | 0         |
>> > | Ssl_used_session_cache_entries    | 0         |
>> > | Ssl_verify_depth                  | 0         |
>> > | Ssl_verify_mode                   | 0         |
>> > | Ssl_version                       |           |
>> > | Table_locks_immediate             | 33647849  |
>> > | Table_locks_waited                | 1979      |
>> > | Tc_log_max_pages_used             | 0         |
>> > | Tc_log_page_size                  | 0         |
>> > | Tc_log_page_waits                 | 0         |
>> > | Threads_cached                    | 0         |
>> > | Threads_connected                 | 85        |
>> > | Threads_created                   | 942288    |
>> > | Threads_running                   | 2         |
>> > | Uptime                            | 16392     |
>> > | Uptime_since_flush_status         | 24309937  |
>> > +-----------------------------------+-----------+
>> >
>> >
>> > Best regards,
>> > Paul
>> >
>> >> -----Original Message-----
>> >> From: opencms-dev-bounces at opencms.org
>> >> [mailto:opencms-dev-bounces at opencms.org] On Behalf Of
>> HERNAN - TFSLA
>> >> Sent: 2. mai 2011 14:19
>> >> To: opencms-dev at opencms.org
>> >> Subject: Re: [opencms-dev]
>> >> MySQLNonTransientConnectionException - too many connections
>> >>
>> >>
>> >> Please post your:
>> >> * opencms.properties
>> >> * mysql variables status (show status;)
>> >> * j/connector version
>> >>
>> >> Most likely you have your opencms.properties 'default' and is
>> >> not getting
>> >> along with some mysql configuration such as wait_timeout.
>> >>
>> >> Regards
>> >> HernĂ¡n.
>> >>
>> >>
>> >> Paul-Inge Flakstad wrote:
>> >> >
>> >> > Hi guys,
>> >> >
>> >> > We recently launched our primary website on OpenCms (yay!).
>> >> It is curretly
>> >> > at ~3000 pageviews a day. Not _that_ much traffic, but
>> >> every so often (way
>> >> > too often), it "hangs" - often for as long as a minute or more.
>> >> >
>> >> > This is what happens:
>> >> >
>> >> >
>> com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Data
>> >> > source rejected establishment of connection,  message from
>> >> server: "Too
>> >> > many connections"
>> >> >         at
>> >> com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
>> >> >         at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1070)
>> >> >         at
>> >> com.mysql.jdbc.Connection.createNewIO(Connection.java:2748)
>> >> >         at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
>> >> >         at
>> >> >
>> >> com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriv
>> >> er.java:285)
>> >> >         at
>> >> java.sql.DriverManager.getConnection(DriverManager.java:582)
>> >> >         at
>> >> java.sql.DriverManager.getConnection(DriverManager.java:185)
>> >> >         at
>> >> >
>> >> org.apache.commons.dbcp.DriverManagerConnectionFactory.createC
>> >> onnection(DriverManagerConnectionFactory.java:65)
>> >> >         at
>> >> >
>> >> org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(P
>> >> oolableConnectionFactory.java:294)
>> >> >         at
>> >> >
>> >> org.apache.commons.pool.impl.GenericObjectPool.borrowObject(Ge
>> >> nericObjectPool.java:1148)
>> >> >         at
>> >> >
>> >>
>> org.apache.commons.dbcp.PoolingDriver.connect(PoolingDriver.java:176)
>> >> >         at
>> >> java.sql.DriverManager.getConnection(DriverManager.java:582)
>> >> >         at
>> >> java.sql.DriverManager.getConnection(DriverManager.java:207)
>> >> >         at
>> >> >
>> >> org.opencms.db.CmsSqlManager.getConnectionByUrl(CmsSqlManager.
>> >> java:104)
>> >> >         at
>> >> >
>> >> org.opencms.db.generic.CmsSqlManager.getConnection(CmsSqlManag
>> >> er.java:231)
>> >> >         at
>> >> >
>> >> org.opencms.db.generic.CmsVfsDriver.readResource(CmsVfsDriver.
>> >> java:1931)
>> >> >         ... 75 more
>> >> >
>> >> > The exception was not present in the several months of
>> >> development and
>> >> > beta testing, so it's no doubt the traffic that's causing
>> >> it. I've never
>> >> > seen this before, but then again, I've been working mostly
>> >> on smaller
>> >> > sites with much less traffic.
>> >> >
>> >> > After learning of the setting in MySQL, I have (just now) set
>> >> > max_connections to 2048. No max_connections was present in
>> >> my.cnf from
>> >> > before, so I'm guessing it was 100 (the default value).
>> >> >
>> >> > Will this fix things? Should I do anything else, in order
>> >> to allow many
>> >> > concurrent users / avoid this exception?
>> >> >
>> >> > Best regards,
>> >> > Paul
>> >> >
>> >> > _______________________________________________
>> >> > This mail is sent to you from the opencms-dev mailing list
>> >> > To change your list options, or to unsubscribe from the
>> >> list, please visit
>> >> > http://lists.opencms.org/mailman/listinfo/opencms-dev
>> >> >
>> >> >
>> >>
>> >> --
>> >> View this message in context:
>> >> http://old.nabble.com/MySQLNonTransientConnectionException---t
>> > oo-many-connections-tp31521630p31523002.html
>> >> Sent from the OpenCMS - Dev mailing list archive at Nabble.com.
>> >>
>> >>
>> >> _______________________________________________
>> >> This mail is sent to you from the opencms-dev mailing list
>> >> To change your list options, or to unsubscribe from the list,
>> >> please visit
>> >> http://lists.opencms.org/mailman/listinfo/opencms-dev
>> >
>> > _______________________________________________
>> > This mail is sent to you from the opencms-dev mailing list
>> > To change your list options, or to unsubscribe from the
>> list, please visit
>> > http://lists.opencms.org/mailman/listinfo/opencms-dev
>> >
>> >
>>
>> --
>> View this message in context:
>> http://old.nabble.com/MySQLNonTransientConnectionException---t
> oo-many-connections-tp31521630p31527995.html
>> Sent from the OpenCMS - Dev mailing list archive at Nabble.com.
>>
>>
>> _______________________________________________
>> This mail is sent to you from the opencms-dev mailing list
>> To change your list options, or to unsubscribe from the list,
>> please visit
>> http://lists.opencms.org/mailman/listinfo/opencms-dev
> 
> _______________________________________________
> This mail is sent to you from the opencms-dev mailing list
> To change your list options, or to unsubscribe from the list, please visit
> http://lists.opencms.org/mailman/listinfo/opencms-dev
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