Mysql内存使用量不断增长，直到OOM和系统停止/重新启动
我在Ubuntu 16.04.4下有MySQL 5.7.27，64位，4GB内存和SSD（它是一个虚拟机）。我正在观察mysqld中的驻留内存增长，直到没有更多的资源可用，并且操作系统停止/重新启动mysqld 一些后台-系统用于从远程位置收集信息，每个位置收集一个实体。每个实体可能有数百个数据点。对于每个远程位置，有两个数据库，支持两种情况：每个位置是每个客户的（但一个客户可能有数千个这样的位置），在某些情况下，可能有数千个实体从每个远程位置收集。这两个数据库对应于收集的原始数据和“处理”的摘要。此外，每个客户还有一个额外的数据库，记录每个远程位置的管理员和其他数据。因此，对于客户，总DB计数为C*（1+2L）-C，对于位置，总DB计数为L。2L的第一个DB有32个表，最小大小为2MB（但我至少有一个示例，它的大小为5.9GB—不在当前的示例集中）—它在每个采集事件开始时被“清除”；第二个有12个表，当前样本集中的典型大小为1MB（尽管每个采集事件都会累积） 每个远程位置定期执行远程收集，例如每周或每月一次。每次收集后，都会运行一个流程，将所有2L数据库中的数据汇总到一个统一的数据库中 在有问题的系统中，C（1+2升）等于5000多。当汇总过程运行时，mysqld驻留内存（使用Mysql内存使用量不断增长，直到OOM和系统停止/重新启动,mysql,database-tuning,Mysql,Database Tuning,我在Ubuntu 16.04.4下有MySQL 5.7.27，64位，4GB内存和SSD（它是一个虚拟机）。我正在观察mysqld中的驻留内存增长，直到没有更多的资源可用，并且操作系统停止/重新启动mysqld 一些后台-系统用于从远程位置收集信息，每个位置收集一个实体。每个实体可能有数百个数据点。对于每个远程位置，有两个数据库，支持两种情况：每个位置是每个客户的（但一个客户可能有数千个这样的位置），在某些情况下，可能有数千个实体从每个远程位置收集。这两个数据库对应于收集的原始数据和“处理”的摘
topshow engine performance\u schema status在三种情况下：驻留内存分别为2459MB、2478MB和2910MB。在这三个样本之间，我只看到了以下指标的差异：
2459MB 2478MB 2910MB
(digest_hash).count 4676 -> 4837 -> 4958
(filename_hash).count 121118 -> 121139 -> 121214
(table_share_hash).count 27229 -> 27247 -> 27276
mutex_instances.count 29696 -> 30720 -> 31744
mutex_instances.memory 3801088 -> 3932160 -> 4063232
performance_scheme.memory 426293432 -> 426424504 -> 4266886648
rwlock_instances.count 400384 -> 400384 -> 401408
rwlock_instances.memory 51249152 -> 51249152 -> 51380224
我的期望是，在每次汇总运行结束时，mysqld中的“临时”缓冲区空间将被释放，或者在该流程的下一次运行时被重用，因为它在同一组数据库/表中有效地执行相同的查询序列（以及非常类似的更新）。内存占用增长的事实向我表明，要么mysqld中存在内存泄漏，要么与某些故障条件（连接、锁、互斥？）相关的故意“缓冲区”至少是内存增长的部分原因。我建议使用后者，因为我会看看在随后的总结过程中，mysqld中会保留什么
我还尝试运行mysqltuner.pl（请参阅），但这也会导致内存增长问题，这无疑与数据库的数量有关。然而，如果我可以提到，不管MySQL对数据库和表的数量有什么限制，这里的数字对mysqld本身并不重要，即使它们可能对底层操作系统也是如此。我承认，在一个规格不太高的系统上，服务器显然每秒处理1000次以上的选择，这给我留下了深刻的印象
那么，我应该查看哪些“监控”参数来帮助调优mysql、操作系统或平台，在这种情况下，哪些（mysql/OS）调优参数最有帮助？我可以采用这种方法（），但如果我遇到的问题是内存泄漏，那么仅仅增加更多的RAM只会推迟不可避免的问题
------------编辑Rick James的以下回答（2020/01/13）-
RAM-4GB
显示变量；（较少SSL相关信息）输出：
在上自动生成证书
自动增量增量增量1
自动增量偏移量1
自动提交
上的自动\u sp\u权限
避免临时升级
背面日志80
basedir/usr/
大桌子
绑定地址*
binlog_缓存_大小32768
binlog_校验和CRC32
binlog\u直接\u非事务\u更新关闭
binlog\u错误\u操作中止\u服务器
binlog\u格式行
binlog\u组\u提交\u同步\u延迟0
binlog\u组\u提交\u同步\u无延迟\u计数0
binlog_gtid_上的简单_恢复
binlog\u最大\u刷新\u队列\u时间0
binlog_订单_提交于
binlog\u行\u图像已满
binlog\u行\u查询\u日志\u事件关闭
binlog\u stmt\u缓存大小32768
binlog\事务\依赖关系\历史\大小25000
binlog\事务\依赖项\跟踪提交\顺序
块加密模式aes-128-ecb
批量插入缓冲区大小8388608
字符集客户端utf8mb4
字符集连接utf8mb4
字符集数据库utf8
字符集文件系统二进制
字符集结果utf8mb4
字符集服务器utf8
字符集系统utf8
字符集目录/usr/share/mysql/charsets/
勾选\u代理\u用户
排序规则\u连接utf8mb4\u常规\u ci
排序规则\u数据库utf8\u unicode\u ci
排序规则\u服务器utf8\u unicode\u ci
完成型无链
并发插入自动
连接超时10
取芯锉刀
datadir/var/lib/mysql/
日期\u格式%Y-%m-%d
日期时间\u格式%Y-%m-%d%H:%i:%s
默认\u身份验证\u插件mysql\u本机\u密码
默认\u密码\u生存期0
默认存储引擎InnoDB
默认\u tmp\u存储\u引擎InnoDB
默认\u周\u格式0
延迟键写入
延迟插入限制100
延迟插入超时300
延迟队列大小1000
禁用存储引擎
断开\u上的连接\u密码已过期\u上
div_精度_增量4
结束标记处于关闭状态
强制关闭_gtid_一致性
2459MB 2478MB 2910MB
(digest_hash).count 4676 -> 4837 -> 4958
(filename_hash).count 121118 -> 121139 -> 121214
(table_share_hash).count 27229 -> 27247 -> 27276
mutex_instances.count 29696 -> 30720 -> 31744
mutex_instances.memory 3801088 -> 3932160 -> 4063232
performance_scheme.memory 426293432 -> 426424504 -> 4266886648
rwlock_instances.count 400384 -> 400384 -> 401408
rwlock_instances.memory 51249152 -> 51249152 -> 51380224
auto_generate_certs ON
auto_increment_increment 1
auto_increment_offset 1
autocommit ON
automatic_sp_privileges ON
avoid_temporal_upgrade OFF
back_log 80
basedir /usr/
big_tables OFF
bind_address *
binlog_cache_size 32768
binlog_checksum CRC32
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binlog_transaction_dependency_tracking COMMIT_ORDER
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datadir /var/lib/mysql/
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datetime_format %Y-%m-%d %H:%i:%s
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innodb_data_home_dir
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innodb_ft_user_stopword_table
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innodb_log_group_home_dir ./
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innodb_stats_method nulls_equal
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innodb_stats_persistent_sample_pages 20
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innodb_stats_transient_sample_pages 8
innodb_status_output OFF
innodb_status_output_locks OFF
innodb_strict_mode ON
innodb_support_xa ON
innodb_sync_array_size 1
innodb_sync_spin_loops 30
innodb_table_locks ON
innodb_temp_data_file_path ibtmp1:12M:autoextend
innodb_thread_concurrency 0
innodb_thread_sleep_delay 10000
innodb_tmpdir
innodb_undo_directory ./
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innodb_version 5.7.28
innodb_write_io_threads 4
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interactive_timeout 28800
internal_tmp_disk_storage_engine InnoDB
join_buffer_size 262144
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key_buffer_size 16777216
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keyring_operations ON
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lc_messages en_US
lc_messages_dir /usr/share/mysql/
lc_time_names en_US
license GPL
local_infile ON
lock_wait_timeout 31536000
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log_bin_basename
log_bin_index
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pid_file /var/run/mysqld/mysqld.pid
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relay_log
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slave_parallel_type DATABASE
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slow_query_log_file /var/lib/mysql/demo-slow.log
socket /var/run/mysqld/mysqld.sock
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sql_big_selects ON
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sql_log_bin ON
sql_log_off OFF
sql_mode ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
sql_notes ON
sql_quote_show_create ON
sql_safe_updates OFF
sql_select_limit 1.84467440737096E+019
sql_slave_skip_counter 0
sql_warnings OFF
stored_program_cache 256
super_read_only OFF
sync_binlog 1
sync_frm ON
sync_master_info 10000
sync_relay_log 10000
sync_relay_log_info 10000
system_time_zone GMT
table_definition_cache 2000
table_open_cache 5200
table_open_cache_instances 16
thread_cache_size 8
thread_handling one-thread-per-connection
thread_stack 262144
time_format %H:%i:%s
time_zone SYSTEM
timestamp 1579095336.07864
tls_version TLSv1,TLSv1.1,TLSv1.2
tmp_table_size 16777216
tmpdir /tmp
transaction_alloc_block_size 8192
transaction_allow_batching OFF
transaction_isolation REPEATABLE-READ
transaction_prealloc_size 4096
transaction_read_only OFF
transaction_write_set_extraction OFF
tx_isolation REPEATABLE-READ
tx_read_only OFF
unique_checks ON
updatable_views_with_limit YES
version 5.7.28-0ubuntu0.16.04.2
version_comment (Ubuntu)
version_compile_machine x86_64
version_compile_os Linux
wait_timeout 28800
warning_count 0
Aborted_clients 0
Aborted_connects 4
Binlog_cache_disk_use 0
Binlog_cache_use 0
Binlog_stmt_cache_disk_use 0
Binlog_stmt_cache_use 0
Bytes_received 120596117
Bytes_sent 423055987
Com_admin_commands 1422
Com_change_db 1969
Com_delete 26
Com_delete_multi 5
Com_flush 5
Com_insert 543
Com_lock_tables 106103
Com_select 290121
Com_set_option 3952
Com_show_charsets 4
Com_show_fields 1756
Com_show_keys 3
Com_show_plugins 1
Com_show_status 2317
Com_show_tables 4
Com_show_variables 10
Com_unlock_tables 106103
Com_update 119462
Connection_errors_accept 0
Connection_errors_internal 0
Connection_errors_max_connections 0
Connection_errors_peer_address 0
Connection_errors_select 0
Connection_errors_tcpwrap 0
Connections 53918
Created_tmp_disk_tables 7205
Created_tmp_files 6
Created_tmp_tables 26682
Delayed_errors 0
Delayed_insert_threads 0
Delayed_writes 0
Flush_commands 1
Handler_commit 516258
Handler_delete 605
Handler_discover 0
Handler_external_lock 1131715
Handler_mrr_init 0
Handler_prepare 0
Handler_read_first 251891
Handler_read_key 1450835
Handler_read_last 0
Handler_read_next 46912240
Handler_read_prev 0
Handler_read_rnd 333804
Handler_read_rnd_next 77706400
Handler_rollback 0
Handler_savepoint 0
Handler_savepoint_rollback 0
Handler_update 20612
Handler_write 139820
Innodb_buffer_pool_dump_status Dumping of buffer pool not started
Innodb_buffer_pool_load_status Buffer pool(s) load completed at 200110 15:44:11
Innodb_buffer_pool_resize_status
Innodb_buffer_pool_pages_data 7744
Innodb_buffer_pool_bytes_data 126877696
Innodb_buffer_pool_pages_dirty 0
Innodb_buffer_pool_bytes_dirty 0
Innodb_buffer_pool_pages_flushed 10525
Innodb_buffer_pool_pages_free 128
Innodb_buffer_pool_pages_misc 319
Innodb_buffer_pool_pages_total 8191
Innodb_buffer_pool_read_ahead_rnd 0
Innodb_buffer_pool_read_ahead 2174
Innodb_buffer_pool_read_ahead_evicted 552
Innodb_buffer_pool_read_requests 92861248
Innodb_buffer_pool_reads 230500
Innodb_buffer_pool_wait_free 0
Innodb_buffer_pool_write_requests 490867
Innodb_data_fsyncs 6682
Innodb_data_pending_fsyncs 0
Innodb_data_pending_reads 0
Innodb_data_pending_writes 0
Innodb_data_read 3812250112
Innodb_data_reads 257019
Innodb_data_writes 36166
Innodb_data_written 301705728
Innodb_dblwr_pages_written 5776
Innodb_dblwr_writes 1121
Innodb_log_waits 0
Innodb_log_write_requests 24009
Innodb_log_writes 23298
Innodb_os_log_fsyncs 3651
Innodb_os_log_pending_fsyncs 0
Innodb_os_log_pending_writes 0
Innodb_os_log_written 34017280
Innodb_page_size 16384
Innodb_pages_created 388
Innodb_pages_read 232676
Innodb_pages_written 10525
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 605
Innodb_rows_inserted 33914
Innodb_rows_read 125144394
Innodb_rows_updated 20612
Innodb_num_open_files 5200
Innodb_truncated_status_writes 0
Innodb_available_undo_logs 128
Key_blocks_not_flushed 0
Key_blocks_unused 13396
Key_blocks_used 3
Key_read_requests 6
Key_reads 3
Key_write_requests 0
Key_writes 0
Locked_connects 0
Max_execution_time_exceeded 0
Max_execution_time_set 0
Max_execution_time_set_failed 0
Max_used_connections 14
Max_used_connections_time 10/01/20 15:50
Not_flushed_delayed_rows 0
Ongoing_anonymous_transaction_count 0
Open_files 0
Open_streams 0
Open_table_definitions 3464
Open_tables 5200
Opened_files 337104
Opened_table_definitions 140571
Opened_tables 76095
Performance_schema_accounts_lost 0
Performance_schema_cond_classes_lost 0
Performance_schema_cond_instances_lost 0
Performance_schema_digest_lost 0
Performance_schema_file_classes_lost 0
Performance_schema_file_handles_lost 0
Performance_schema_file_instances_lost 0
Performance_schema_hosts_lost 0
Performance_schema_index_stat_lost 0
Performance_schema_locker_lost 0
Performance_schema_memory_classes_lost 0
Performance_schema_metadata_lock_lost 0
Performance_schema_mutex_classes_lost 0
Performance_schema_mutex_instances_lost 0
Performance_schema_nested_statement_lost 0
Performance_schema_prepared_statements_lost 0
Performance_schema_program_lost 0
Performance_schema_rwlock_classes_lost 0
Performance_schema_rwlock_instances_lost 0
Performance_schema_session_connect_attrs_lost 0
Performance_schema_socket_classes_lost 0
Performance_schema_socket_instances_lost 0
Performance_schema_stage_classes_lost 0
Performance_schema_statement_classes_lost 0
Performance_schema_table_handles_lost 0
Performance_schema_table_instances_lost 0
Performance_schema_table_lock_stat_lost 0
Performance_schema_thread_classes_lost 0
Performance_schema_thread_instances_lost 0
Performance_schema_users_lost 0
Prepared_stmt_count 0
Qcache_free_blocks 1
Qcache_free_memory 16760152
Qcache_hits 0
Qcache_inserts 0
Qcache_lowmem_prunes 0
Qcache_not_cached 184049
Qcache_queries_in_cache 0
Qcache_total_blocks 1
Queries 687716
Questions 684326
Rsa_public_key <removed>
Select_full_join 2827
Select_full_range_join 319
Select_range 56255
Select_range_check 1525
Select_scan 156904
Slave_open_temp_tables 0
Slow_launch_threads 0
Slow_queries 0
Sort_merge_passes 0
Sort_range 61935
Sort_rows 116417
Sort_scan 99600
Table_locks_immediate 458
Table_locks_waited 0
Table_open_cache_hits 381570
Table_open_cache_misses 76095
Table_open_cache_overflows 70888
Tc_log_max_pages_used 0
Tc_log_page_size 0
Tc_log_page_waits 0
Threads_cached 7
Threads_connected 3
Threads_created 14
Threads_running 1
Uptime 424288
Uptime_since_flush_status 424288
* Version: 5.7.28-0ubuntu0.16.04.2
* 4 GB of RAM
* Uptime = 4d 21:51:28
* Are you sure this was a SHOW GLOBAL STATUS ?
* You are not running on Windows.
* Running 64-bit version
* You appear to be running entirely (or mostly) InnoDB.
Com_insert = 4.6 /HR
Created_tmp_files = 0.051 /HR
Handler_write = 0.33 /sec
Innodb_buffer_pool_bytes_data = 299 /sec
Key_read_requests = 0.051 /HR
Key_reads+Key_writes + Innodb_pages_read+Innodb_pages_written+Innodb_dblwr_writes+Innodb_buffer_pool_pages_flushed = 0.6 /sec
Open_files = 0
Table_locks_immediate = 3.9 /HR
Com_unlock_tables = 0.25 /sec
Innodb_num_open_files = 5,200
Open_table_definitions = 3,464
Open_tables = 5,200
performance_schema_max_rwlock_classes = 50
innodb_fast_shutdown = 1
optimizer_trace = enabled=off,one_line=off
optimizer_trace_features = greedy_search=on, range_optimizer=on, dynamic_range=on, repeated_subselect=on
require_secure_transport = ON
slave_rows_search_algorithms = TABLE_SCAN,INDEX_SCAN