拥有已经运行了两年的应用程序，没有出现任何问题。突然，我们开始看到Mariadb崩溃并在各种查询中恢复，这些查询似乎通常在其上运行filesort函数。我们执行许多复杂的查询，有时会被迫对计算字段进行排序。这些以前没有问题，所以我不认为查询本身有错。
我不确定这是配置问题还是问题或硬件问题。非常感谢您的协助。
服务器的RAM为16GB，带有6个CPU。
日志文件如下：
Version: '10.2.24-MariaDB-log' socket: '/mnt/volume-01-part1/mysql/mysql.sock' port: 3306 MariaDB Server
2019-06-27 12:52:23 139999433680640 [ERROR] InnoDB: Table `mysql`.`innodb_table_stats` not found.
190627 12:53:18 [ERROR] mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
To report this bug, see https://mariadb.com/kb/en/reporting-bugs
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.
Server version: 10.2.24-MariaDB-log
key_buffer_size=10485760
read_buffer_size=2097152
max_used_connections=9
max_threads=102
thread_count=16
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 430185 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x7f53b80009a8
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7f54287d1d30 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x56288037858e]
/usr/sbin/mysqld(handle_fatal_signal+0x30d)[0x56287fe0421d]
sigaction.c:0(__restore_rt)[0x7f576a7ca5d0]
/usr/sbin/mysqld(_Z8filesortP3THDP5TABLEP8FilesortP16Filesort_trackerP4JOINy+0x2b4)[0x56287fe02684]
/usr/sbin/mysqld(_Z17create_sort_indexP3THDP4JOINP13st_join_tableP8Filesort+0xd7)[0x56287fcb1b57]
/usr/sbin/mysqld(_ZN17Window_funcs_sort4execEP4JOINb+0x4a)[0x56287fd8ee2a]
/usr/sbin/mysqld(_ZN24Window_funcs_computation4execEP4JOINb+0x2a)[0x56287fd8f53a]
/usr/sbin/mysqld(_ZN7AGGR_OP8end_sendEv+0xe7)[0x56287fcc20d7]
/usr/sbin/mysqld(_Z24sub_select_postjoin_aggrP4JOINP13st_join_tableb+0x31)[0x56287fcc22a1]
/usr/sbin/mysqld(_ZN4JOIN10exec_innerEv+0x903)[0x56287fcc2bf3]
/usr/sbin/mysqld(_ZN4JOIN4execEv+0x33)[0x56287fcc2f43]
/usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x11a)[0x56287fcc309a]
/usr/sbin/mysqld(_Z18mysql_derived_fillP3THDP3LEXP10TABLE_LIST+0x152)[0x56287fc4ae62]
/usr/sbin/mysqld(_Z27mysql_handle_single_derivedP3LEXP10TABLE_LISTj+0xe4)[0x56287fc4abd4]
/usr/sbin/mysqld(_ZN13st_join_table12preread_initEv+0xdf)[0x56287fca2fbf]
/usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x2f8)[0x56287fca32c8]
/usr/sbin/mysqld(_ZN4JOIN10exec_innerEv+0xa3f)[0x56287fcc2d2f]
/usr/sbin/mysqld(_ZN4JOIN4execEv+0x33)[0x56287fcc2f43]
/usr/sbin/mysqld(_Z12mysql_selectP3THDP10TABLE_LISTjR4ListI4ItemEPS4_jP8st_orderS9_S7_S9_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x11a)[0x56287fcc309a]
/usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x254)[0x56287fcc3bf4]
/usr/sbin/mysqld(+0x41c4ef)[0x56287fba74ef]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x334d)[0x56287fc6e99d]
/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x2de)[0x56287fc748ee]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x21f5)[0x56287fc77ac5]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x165)[0x56287fc786e5]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x1aa)[0x56287fd41e3a]
/usr/sbin/mysqld(handle_one_connection+0x3d)[0x56287fd41f5d]
pthread_create.c:0(start_thread)[0x7f576a7c2dd5]
/lib64/libc.so.6(clone+0x6d)[0x7f5768b64ead]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7f53b800f130): [REMOVED]
Connection ID (thread ID): 31
Status: NOT_KILLED
Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
Writing a core file...
Working directory at /mnt/volume-01-part1/mysql
Resource Limits:
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 63458 63458 processes
Max open files 16364 16364 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 63458 63458 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
Core pattern: core
服务器变量为：
'aria_block_size', '8192'
'aria_checkpoint_interval', '30'
'aria_checkpoint_log_activity', '1048576'
'aria_encrypt_tables', 'OFF'
'aria_force_start_after_recovery_failures', '0'
'aria_group_commit', 'none'
'aria_group_commit_interval', '0'
'aria_log_file_size', '1073741824'
'aria_log_purge_type', 'immediate'
'aria_max_sort_file_size', '9223372036853727232'
'aria_page_checksum', 'ON'
'aria_pagecache_age_threshold', '300'
'aria_pagecache_buffer_size', '134217728'
'aria_pagecache_division_limit', '100'
'aria_pagecache_file_hash_size', '512'
'aria_recover_options', 'BACKUP,QUICK'
'aria_repair_threads', '1'
'aria_sort_buffer_size', '268434432'
'aria_stats_method', 'nulls_unequal'
'aria_sync_log_dir', 'NEWFILE'
'aria_used_for_temp_tables', 'ON'
'auto_increment_increment', '1'
'auto_increment_offset', '1'
'autocommit', 'ON'
'automatic_sp_privileges', 'ON'
'back_log', '50'
'basedir', '/usr/'
'big_tables', 'OFF'
'binlog_annotate_row_events', 'ON'
'binlog_cache_size', '31457280'
'binlog_checksum', 'CRC32'
'binlog_commit_wait_count', '0'
'binlog_commit_wait_usec', '100000'
'binlog_direct_non_transactional_updates', 'OFF'
'binlog_format', 'MIXED'
'binlog_optimize_thread_scheduling', 'ON'
'binlog_row_image', 'FULL'
'binlog_stmt_cache_size', '32768'
'bulk_insert_buffer_size', '8388608'
'character_set_client', 'utf8'
'character_set_connection', 'utf8'
'character_set_database', 'utf8'
'character_set_filesystem', 'binary'
'character_set_results', 'utf8'
'character_set_server', 'latin1'
'character_set_system', 'utf8'
'character_sets_dir', '/usr/share/mysql/charsets/'
'check_constraint_checks', 'ON'
'collation_connection', 'utf8_general_ci'
'collation_database', 'utf8_general_ci'
'collation_server', 'latin1_swedish_ci'
'completion_type', 'NO_CHAIN'
'concurrent_insert', 'AUTO'
'connect_timeout', '10'
'core_file', 'OFF'
'datadir', '/mnt/volume-01-part1/mysql/'
'date_format', '%Y-%m-%d'
'datetime_format', '%Y-%m-%d %H:%i:%s'
'deadlock_search_depth_long', '15'
'deadlock_search_depth_short', '4'
'deadlock_timeout_long', '50000000'
'deadlock_timeout_short', '10000'
'debug_no_thread_alarm', 'OFF'
'default_master_connection', ''
'default_regex_flags', ''
'default_storage_engine', 'MyISAM'
'default_tmp_storage_engine', ''
'default_week_format', '0'
'delay_key_write', 'ON'
'delayed_insert_limit', '100'
'delayed_insert_timeout', '300'
'delayed_queue_size', '1000'
'div_precision_increment', '4'
'encrypt_binlog', 'OFF'
'encrypt_tmp_disk_tables', 'OFF'
'encrypt_tmp_files', 'OFF'
'enforce_storage_engine', ''
'eq_range_index_dive_limit', '0'
'error_count', '0'
'event_scheduler', 'OFF'
'expensive_subquery_limit', '100'
'expire_logs_days', '3'
'explicit_defaults_for_timestamp', 'OFF'
'external_user', ''
'extra_max_connections', '1'
'extra_port', '0'
'flush', 'OFF'
'flush_time', '0'
'foreign_key_checks', 'ON'
'ft_boolean_syntax', '+ -><()~*:\"\"&|'
'ft_max_word_len', '84'
'ft_min_word_len', '4'
'ft_query_expansion_limit', '20'
'ft_stopword_file', '(built-in)'
'general_log', 'OFF'
'general_log_file', 'dtd-db-01.log'
'group_concat_max_len', '1048576'
'gtid_binlog_pos', '0-1-11007595'
'gtid_binlog_state', '0-1-11007595'
'gtid_current_pos', '0-1-11007595'
'gtid_domain_id', '0'
'gtid_ignore_duplicates', 'OFF'
'gtid_seq_no', '0'
'gtid_slave_pos', ''
'gtid_strict_mode', 'OFF'
'have_compress', 'YES'
'have_crypt', 'YES'
'have_dynamic_loading', 'YES'
'have_geometry', 'YES'
'have_openssl', 'YES'
'have_profiling', 'YES'
'have_query_cache', 'YES'
'have_rtree_keys', 'YES'
'have_ssl', 'DISABLED'
'have_symlink', 'DISABLED'
'histogram_size', '0'
'histogram_type', 'SINGLE_PREC_HB'
'host_cache_size', '228'
'hostname', 'dtd-db-01'
'identity', '0'
'ignore_builtin_innodb', 'OFF'
'ignore_db_dirs', ''
'in_transaction', '0'
'init_connect', ''
'init_file', ''
'init_slave', ''
'innodb_adaptive_flushing', 'ON'
'innodb_adaptive_flushing_lwm', '10.000000'
'innodb_adaptive_hash_index', 'ON'
'innodb_adaptive_hash_index_partitions', '8'
'innodb_adaptive_hash_index_parts', '8'
'innodb_adaptive_max_sleep_delay', '150000'
'innodb_autoextend_increment', '64'
'innodb_autoinc_lock_mode', '1'
'innodb_background_scrub_data_check_interval', '3600'
'innodb_background_scrub_data_compressed', 'OFF'
'innodb_background_scrub_data_interval', '604800'
'innodb_background_scrub_data_uncompressed', 'OFF'
'innodb_buf_dump_status_frequency', '0'
'innodb_buffer_pool_chunk_size', '134217728'
'innodb_buffer_pool_dump_at_shutdown', 'ON'
'innodb_buffer_pool_dump_now', 'OFF'
'innodb_buffer_pool_dump_pct', '25'
'innodb_buffer_pool_filename', 'ib_buffer_pool'
'innodb_buffer_pool_instances', '6'
'innodb_buffer_pool_load_abort', 'OFF'
'innodb_buffer_pool_load_at_startup', 'ON'
'innodb_buffer_pool_load_now', 'OFF'
'innodb_buffer_pool_populate', 'OFF'
'innodb_buffer_pool_size', '12079595520'
'innodb_change_buffer_max_size', '25'
'innodb_change_buffering', 'all'
'innodb_checksum_algorithm', 'crc32'
'innodb_checksums', 'ON'
'innodb_cleaner_lsn_age_factor', 'DEPRECATED'
'innodb_cmp_per_index_enabled', 'OFF'
'innodb_commit_concurrency', '0'
'innodb_compression_algorithm', 'zlib'
'innodb_compression_default', 'OFF'
'innodb_compression_failure_threshold_pct', '5'
'innodb_compression_level', '6'
'innodb_compression_pad_pct_max', '50'
'innodb_concurrency_tickets', '5000'
'innodb_corrupt_table_action', 'deprecated'
'innodb_data_file_path', 'ibdata1:10M:autoextend'
'innodb_data_home_dir', ''
'innodb_deadlock_detect', 'ON'
'innodb_default_encryption_key_id', '1'
'innodb_default_row_format', 'dynamic'
'innodb_defragment', 'ON'
'innodb_defragment_fill_factor', '0.900000'
'innodb_defragment_fill_factor_n_recs', '20'
'innodb_defragment_frequency', '40'
'innodb_defragment_n_pages', '7'
'innodb_defragment_stats_accuracy', '0'
'innodb_disable_sort_file_cache', 'OFF'
'innodb_disallow_writes', 'OFF'
'innodb_doublewrite', 'ON'
'innodb_empty_free_list_algorithm', 'DEPRECATED'
'innodb_encrypt_log', 'OFF'
'innodb_encrypt_tables', 'OFF'
'innodb_encryption_rotate_key_age', '1'
'innodb_encryption_rotation_iops', '100'
'innodb_encryption_threads', '0'
'innodb_fake_changes', 'OFF'
'innodb_fast_shutdown', '1'
'innodb_fatal_semaphore_wait_threshold', '600'
'innodb_file_format', 'Barracuda'
'innodb_file_format_check', 'ON'
'innodb_file_format_max', 'Barracuda'
'innodb_file_per_table', 'ON'
'innodb_fill_factor', '100'
'innodb_flush_log_at_timeout', '1'
'innodb_flush_log_at_trx_commit', '2'
'innodb_flush_method', 'O_DIRECT'
'innodb_flush_neighbors', '1'
'innodb_flush_sync', 'ON'
'innodb_flushing_avg_loops', '30'
'innodb_force_load_corrupted', 'OFF'
'innodb_force_primary_key', 'OFF'
'innodb_force_recovery', '0'
'innodb_foreground_preflush', 'DEPRECATED'
'innodb_ft_aux_table', ''
'innodb_ft_cache_size', '8000000'
'innodb_ft_enable_diag_print', 'OFF'
'innodb_ft_enable_stopword', 'ON'
'innodb_ft_max_token_size', '84'
'innodb_ft_min_token_size', '3'
'innodb_ft_num_word_optimize', '2000'
'innodb_ft_result_cache_limit', '2000000000'
'innodb_ft_server_stopword_table', ''
'innodb_ft_sort_pll_degree', '2'
'innodb_ft_total_cache_size', '640000000'
'innodb_ft_user_stopword_table', ''
'innodb_idle_flush_pct', '100'
'innodb_immediate_scrub_data_uncompressed', 'OFF'
'innodb_instrument_semaphores', 'OFF'
'innodb_io_capacity', '200'
'innodb_io_capacity_max', '2000'
'innodb_kill_idle_transaction', '0'
'innodb_large_prefix', 'ON'
'innodb_lock_schedule_algorithm', 'fcfs'
'innodb_lock_wait_timeout', '120'
'innodb_locking_fake_changes', 'OFF'
'innodb_locks_unsafe_for_binlog', 'OFF'
'innodb_log_arch_dir', ''
'innodb_log_arch_expire_sec', '0'
'innodb_log_archive', 'OFF'
'innodb_log_block_size', '0'
'innodb_log_buffer_size', '33554432'
'innodb_log_checksum_algorithm', 'DEPRECATED'
'innodb_log_checksums', 'ON'
'innodb_log_compressed_pages', 'ON'
'innodb_log_file_size', '3221225472'
'innodb_log_files_in_group', '3'
'innodb_log_group_home_dir', './'
'innodb_log_optimize_ddl', 'ON'
'innodb_log_write_ahead_size', '8192'
'innodb_lru_scan_depth', '512'
'innodb_max_bitmap_file_size', '0'
'innodb_max_changed_pages', '0'
'innodb_max_dirty_pages_pct', '90.000000'
'innodb_max_dirty_pages_pct_lwm', '0.000000'
'innodb_max_purge_lag', '0'
'innodb_max_purge_lag_delay', '0'
'innodb_max_undo_log_size', '10485760'
'innodb_mirrored_log_groups', '0'
'innodb_monitor_disable', ''
'innodb_monitor_enable', ''
'innodb_monitor_reset', ''
'innodb_monitor_reset_all', ''
'innodb_mtflush_threads', '8'
'innodb_old_blocks_pct', '37'
'innodb_old_blocks_time', '1000'
'innodb_online_alter_log_max_size', '134217728'
'innodb_open_files', '2048'
'innodb_optimize_fulltext_only', 'OFF'
'innodb_page_cleaners', '4'
'innodb_page_size', '16384'
'innodb_prefix_index_cluster_optimization', 'OFF'
'innodb_print_all_deadlocks', 'OFF'
'innodb_purge_batch_size', '300'
'innodb_purge_rseg_truncate_frequency', '128'
'innodb_purge_threads', '4'
'innodb_random_read_ahead', 'OFF'
'innodb_read_ahead_threshold', '56'
'innodb_read_io_threads', '8'
'innodb_read_only', 'OFF'
'innodb_replication_delay', '0'
'innodb_rollback_on_timeout', 'OFF'
'innodb_rollback_segments', '128'
'innodb_safe_truncate', 'ON'
'innodb_sched_priority_cleaner', '0'
'innodb_scrub_log', 'OFF'
'innodb_scrub_log_speed', '256'
'innodb_show_locks_held', '0'
'innodb_show_verbose_locks', '0'
'innodb_sort_buffer_size', '1048576'
'innodb_spin_wait_delay', '6'
'innodb_stats_auto_recalc', 'ON'
'innodb_stats_include_delete_marked', 'OFF'
'innodb_stats_method', 'nulls_equal'
'innodb_stats_modified_counter', '0'
'innodb_stats_on_metadata', 'OFF'
'innodb_stats_persistent', 'ON'
'innodb_stats_persistent_sample_pages', '20'
'innodb_stats_sample_pages', '8'
'innodb_stats_traditional', 'ON'
'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_track_changed_pages', 'OFF'
'innodb_track_redo_log_now', 'OFF'
'innodb_undo_directory', './'
'innodb_undo_log_truncate', 'OFF'
'innodb_undo_logs', '128'
'innodb_undo_tablespaces', '0'
'innodb_use_atomic_writes', 'ON'
'innodb_use_fallocate', 'OFF'
'innodb_use_global_flush_log_at_trx_commit', 'OFF'
'innodb_use_mtflush', 'OFF'
'innodb_use_native_aio', 'ON'
'innodb_use_stacktrace', 'OFF'
'innodb_use_trim', 'ON'
'innodb_version', '5.7.26'
'innodb_write_io_threads', '8'
'insert_id', '0'
'interactive_timeout', '28800'
'join_buffer_size', '262144'
'join_buffer_space_limit', '2097152'
'join_cache_level', '2'
'keep_files_on_create', 'OFF'
'key_buffer_size', '20971520'
'key_cache_age_threshold', '300'
'key_cache_block_size', '1024'
'key_cache_division_limit', '100'
'key_cache_file_hash_size', '512'
'key_cache_segments', '0'
'large_files_support', 'ON'
'large_page_size', '0'
'large_pages', 'OFF'
'last_gtid', ''
'last_insert_id', '0'
'lc_messages', 'en_US'
'lc_messages_dir', ''
'lc_time_names', 'en_US'
'license', 'GPL'
'local_infile', 'ON'
'lock_wait_timeout', '86400'
'locked_in_memory', 'OFF'
'log_bin', 'ON'
'log_bin_basename', '/mnt/volume-01-part1/mysql/mysql-bin'
'log_bin_compress', 'OFF'
'log_bin_compress_min_len', '256'
'log_bin_index', '/mnt/volume-01-part1/mysql/mysql-bin.index'
'log_bin_trust_function_creators', 'OFF'
'log_error', '/var/log/mariadb/mariadb.log'
'log_output', 'FILE'
'log_queries_not_using_indexes', 'OFF'
'log_slave_updates', 'OFF'
'log_slow_admin_statements', 'ON'
'log_slow_filter', 'admin,filesort,filesort_on_disk,full_join,full_scan,query_cache,query_cache_miss,tmp_table,tmp_table_on_disk'
'log_slow_rate_limit', '1'
'log_slow_slave_statements', 'ON'
'log_slow_verbosity', ''
'log_tc_size', '24576'
'log_warnings', '2'
'long_query_time', '10.000000'
'low_priority_updates', 'OFF'
'lower_case_file_system', 'OFF'
'lower_case_table_names', '0'
'master_verify_checksum', 'OFF'
'max_allowed_packet', '16777216'
'max_binlog_cache_size', '18446744073709547520'
'max_binlog_size', '1073741824'
'max_binlog_stmt_cache_size', '18446744073709547520'
'max_connect_errors', '10'
'max_connections', '100'
'max_delayed_threads', '20'
'max_digest_length', '1024'
'max_error_count', '64'
'max_heap_table_size', '134217728'
'max_insert_delayed_threads', '20'
'max_join_size', '18446744073709551615'
'max_length_for_sort_data', '1024'
'max_long_data_size', '16777216'
'max_prepared_stmt_count', '16382'
'max_recursive_iterations', '4294967295'
'max_relay_log_size', '1073741824'
'max_seeks_for_key', '4294967295'
'max_session_mem_used', '9223372036854775807'
'max_sort_length', '1024'
'max_sp_recursion_depth', '0'
'max_statement_time', '0.000000'
'max_tmp_tables', '32'
'max_user_connections', '0'
'max_write_lock_count', '4294967295'
'metadata_locks_cache_size', '1024'
'metadata_locks_hash_instances', '8'
'min_examined_row_limit', '0'
'mrr_buffer_size', '262144'
'multi_range_count', '256'
'myisam_block_size', '1024'
'myisam_data_pointer_size', '6'
'myisam_max_sort_file_size', '9223372036853727232'
'myisam_mmap_size', '18446744073709551615'
'myisam_recover_options', 'DEFAULT'
'myisam_repair_threads', '1'
'myisam_sort_buffer_size', '134216704'
'myisam_stats_method', 'NULLS_UNEQUAL'
'myisam_use_mmap', 'OFF'
'mysql56_temporal_format', 'ON'
'net_buffer_length', '16384'
'net_read_timeout', '30'
'net_retry_count', '10'
'net_write_timeout', '60'
'old', 'OFF'
'old_alter_table', 'OFF'
'old_mode', ''
'old_passwords', 'OFF'
'open_files_limit', '4233'
'optimizer_prune_level', '1'
'optimizer_search_depth', '62'
'optimizer_selectivity_sampling_limit', '100'
'optimizer_switch', 'index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on'
'optimizer_use_condition_selectivity', '1'
'performance_schema', 'OFF'
'performance_schema_accounts_size', '-1'
'performance_schema_digests_size', '-1'
'performance_schema_events_stages_history_long_size', '-1'
'performance_schema_events_stages_history_size', '-1'
'performance_schema_events_statements_history_long_size', '-1'
'performance_schema_events_statements_history_size', '-1'
'performance_schema_events_waits_history_long_size', '-1'
'performance_schema_events_waits_history_size', '-1'
'performance_schema_hosts_size', '-1'
'performance_schema_max_cond_classes', '80'
'performance_schema_max_cond_instances', '-1'
'performance_schema_max_digest_length', '1024'
'performance_schema_max_file_classes', '50'
'performance_schema_max_file_handles', '32768'
'performance_schema_max_file_instances', '-1'
'performance_schema_max_mutex_classes', '200'
'performance_schema_max_mutex_instances', '-1'
'performance_schema_max_rwlock_classes', '40'
'performance_schema_max_rwlock_instances', '-1'
'performance_schema_max_socket_classes', '10'
'performance_schema_max_socket_instances', '-1'
'performance_schema_max_stage_classes', '150'
'performance_schema_max_statement_classes', '188'
'performance_schema_max_table_handles', '-1'
'performance_schema_max_table_instances', '-1'
'performance_schema_max_thread_classes', '50'
'performance_schema_max_thread_instances', '-1'
'performance_schema_session_connect_attrs_size', '-1'
'performance_schema_setup_actors_size', '100'
'performance_schema_setup_objects_size', '100'
'performance_schema_users_size', '-1'
'pid_file', '/mnt/volume-01-part1/mysql/dtd-db-01.pid'
'plugin_dir', '/usr/lib64/mysql/plugin/'
'plugin_maturity', 'unknown'
'port', '3306'
'preload_buffer_size', '32768'
'profiling', 'OFF'
'profiling_history_size', '15'
'progress_report_time', '5'
'protocol_version', '10'
'proxy_user', ''
'pseudo_slave_mode', 'OFF'
'pseudo_thread_id', '4712'
'query_alloc_block_size', '16384'
'query_cache_limit', '2097152'
'query_cache_min_res_unit', '4096'
'query_cache_size', '134217728'
'query_cache_strip_comments', 'OFF'
'query_cache_type', 'ON'
'query_cache_wlock_invalidate', 'OFF'
'query_prealloc_size', '24576'
'rand_seed1', '289429692'
'rand_seed2', '778761261'
'range_alloc_block_size', '4096'
'read_binlog_speed_limit', '0'
'read_buffer_size', '131072'
'read_only', 'OFF'
'read_rnd_buffer_size', '262144'
'relay_log', ''
'relay_log_basename', ''
'relay_log_index', ''
'relay_log_info_file', 'relay-log.info'
'relay_log_purge', 'ON'
'relay_log_recovery', 'OFF'
'relay_log_space_limit', '0'
'replicate_annotate_row_events', 'ON'
'replicate_do_db', ''
'replicate_do_table', ''
'replicate_events_marked_for_skip', 'REPLICATE'
'replicate_ignore_db', ''
'replicate_ignore_table', ''
'replicate_wild_do_table', ''
'replicate_wild_ignore_table', ''
'report_host', ''
'report_password', ''
'report_port', '3306'
'report_user', ''
'rowid_merge_buff_size', '8388608'
'secure_auth', 'ON'
'secure_file_priv', ''
'server_id', '1'
'session_track_schema', 'ON'
'session_track_state_change', 'OFF'
'session_track_system_variables', ''
'session_track_transaction_info', 'OFF'
'skip_external_locking', 'ON'
'skip_name_resolve', 'ON'
'skip_networking', 'OFF'
'skip_parallel_replication', 'OFF'
'skip_replication', 'OFF'
'skip_show_database', 'OFF'
'slave_compressed_protocol', 'OFF'
'slave_ddl_exec_mode', 'IDEMPOTENT'
'slave_domain_parallel_threads', '0'
'slave_exec_mode', 'STRICT'
'slave_load_tmpdir', '/tmp'
'slave_max_allowed_packet', '1073741824'
'slave_net_timeout', '60'
'slave_parallel_max_queued', '131072'
'slave_parallel_mode', 'conservative'
'slave_parallel_threads', '0'
'slave_parallel_workers', '0'
'slave_run_triggers_for_rbr', 'NO'
'slave_skip_errors', 'OFF'
'slave_sql_verify_checksum', 'ON'
'slave_transaction_retries', '10'
'slave_type_conversions', ''
'slow_launch_time', '2'
'slow_query_log', 'OFF'
'slow_query_log_file', 'dtd-db-01-slow.log'
'socket', '/mnt/volume-01-part1/mysql/mysql.sock'
'sort_buffer_size', '2097152'
'sql_auto_is_null', 'OFF'
'sql_big_selects', 'ON'
'sql_buffer_result', 'OFF'
'sql_log_bin', 'ON'
'sql_log_off', 'OFF'
'sql_mode', 'STRICT_TRANS_TABLES,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', '18446744073709551615'
'sql_slave_skip_counter', '0'
'sql_warnings', 'OFF'
'ssl_ca', ''
'ssl_capath', ''
'ssl_cert', ''
'ssl_cipher', ''
'ssl_crl', ''
'ssl_crlpath', ''
'ssl_key', ''
'standard_compliant_cte', 'ON'
'storage_engine', 'MyISAM'
'stored_program_cache', '256'
'strict_password_validation', 'ON'
'sync_binlog', '0'
'sync_frm', 'ON'
'sync_master_info', '10000'
'sync_relay_log', '10000'
'sync_relay_log_info', '10000'
'system_time_zone', 'EDT'
'table_definition_cache', '400'
'table_open_cache', '2048'
'table_open_cache_instances', '8'
'thread_cache_size', '12'
'thread_concurrency', '12'
'thread_handling', 'one-thread-per-connection'
'thread_pool_idle_timeout', '60'
'thread_pool_max_threads', '65536'
'thread_pool_oversubscribe', '3'
'thread_pool_prio_kickup_timer', '1000'
'thread_pool_priority', 'auto'
'thread_pool_size', '6'
'thread_pool_stall_limit', '500'
'thread_stack', '196608'
'time_format', '%H:%i:%s'
'time_zone', 'SYSTEM'
'timed_mutexes', 'OFF'
'timestamp', '1562162811.946458'
'tmp_disk_table_size', '18446744073709551615'
'tmp_memory_table_size', '67108864'
'tmp_table_size', '67108864'
'tmpdir', '/tmp'
'transaction_alloc_block_size', '8192'
'transaction_prealloc_size', '4096'
'tx_isolation', 'REPEATABLE-READ'
'tx_read_only', 'OFF'
'unique_checks', 'ON'
'updatable_views_with_limit', 'YES'
'use_stat_tables', 'NEVER'
'userstat', 'OFF'
'version', '10.2.25-MariaDB-log'
'version_comment', 'MariaDB Server'
'version_compile_machine', 'x86_64'
'version_compile_os', 'Linux'
'version_malloc_library', 'system'
'version_ssl_library', 'OpenSSL 1.0.2k-fips 26 Jan 2017'
'wait_timeout', '28800'
'warning_count', '0'
'wsrep_osu_method', 'TOI'
'wsrep_auto_increment_control', 'ON'
'wsrep_causal_reads', 'OFF'
'wsrep_certification_rules', 'strict'
'wsrep_certify_nonpk', 'ON'
'wsrep_cluster_address', ''
'wsrep_cluster_name', 'my_wsrep_cluster'
'wsrep_convert_lock_to_trx', 'OFF'
'wsrep_data_home_dir', '/mnt/volume-01-part1/mysql/'
'wsrep_dbug_option', ''
'wsrep_debug', 'OFF'
'wsrep_desync', 'OFF'
'wsrep_dirty_reads', 'OFF'
'wsrep_drupal_282555_workaround', 'OFF'
'wsrep_forced_binlog_format', 'NONE'
'wsrep_gtid_domain_id', '0'
'wsrep_gtid_mode', 'OFF'
'wsrep_load_data_splitting', 'ON'
'wsrep_log_conflicts', 'OFF'
'wsrep_max_ws_rows', '0'
'wsrep_max_ws_size', '2147483647'
'wsrep_mysql_replication_bundle', '0'
'wsrep_node_address', ''
'wsrep_node_incoming_address', 'AUTO'
'wsrep_node_name', 'dtd-db-01'
'wsrep_notify_cmd', ''
'wsrep_on', 'OFF'
'wsrep_patch_version', 'wsrep_25.24'
'wsrep_provider', 'none'
'wsrep_provider_options', ''
'wsrep_recover', 'OFF'
'wsrep_reject_queries', 'NONE'
'wsrep_replicate_myisam', 'OFF'
'wsrep_restart_slave', 'OFF'
'wsrep_retry_autocommit', '1'
'wsrep_slave_fk_checks', 'ON'
'wsrep_slave_uk_checks', 'OFF'
'wsrep_slave_threads', '1'
'wsrep_sst_auth', ''
'wsrep_sst_donor', ''
'wsrep_sst_donor_rejects_queries', 'OFF'
'wsrep_sst_method', 'rsync'
'wsrep_sst_receive_address', 'AUTO'
'wsrep_start_position', '00000000-0000-0000-0000-000000000000:-1'
'wsrep_sync_wait', '0'
编辑： 显示全球状态； https://pastebin.com/3iXGGZ6N
（对不起，太长了）
答案 0 :(得分：0)
观察
：更重要的问题：
binlog_cache_size太高了-从30M变为1M
建议使用慢速日志；参见http://mysql.rjweb.org/doc.php/mysql_analysis#slow_queries_and_slowlog
详细信息和其他观察结果：
( binlog_cache_size * max_connections / _ram ) = 30M * 100 / 16384M = 18.3%-用于在到binlog的途中缓存事务的RAM。
-减少binlog_cache_size和/或max_connections
( innodb_lru_scan_depth * innodb_page_cleaners ) = 512 * 4 = 2,048-每秒页面清洁器的工作量。
-“ InnoDB：page_cleaner：花了1000毫秒的预期循环时间……”可以通过降低lru_scan_depth来解决：考虑1000 / innodb_page_cleaners
( innodb_page_cleaners / innodb_buffer_pool_instances ) = 4 / 6 = 0.667-innodb_page_cleaners
-建议将innodb_page_cleaners设置为innodb_buffer_pool_instances
( Innodb_buffer_pool_pages_free / Innodb_buffer_pool_pages_total ) = 181,655 / 737235 = 24.6%-当前未使用的缓冲池百分比
-innodb_buffer_pool_size是否大于必需的？
( Innodb_pages_written / Innodb_buffer_pool_write_requests ) = 33,499 / 70858 = 47.3%-写入必须访问磁盘的请求
-检查innodb_buffer_pool_size
( Uptime / 60 * innodb_log_file_size / Innodb_os_log_written ) = 11,063 / 60 * 3072M / 24557056 = 24,186-InnoDB日志轮换之间的分钟数，从5.6.8开始，可以动态更改。一定还要更改my.cnf。
-（建议每两次轮换60分钟有点随意。）调整innodb_log_file_size。 （无法在AWS中更改。）
( default_tmp_storage_engine ) = default_tmp_storage_engine =
( innodb_flush_neighbors ) = 1-将块写入磁盘时的次要优化。
-SSD驱动器使用0; 1个用于HDD。
( innodb_io_capacity ) = 200-磁盘上每秒可进行的I / O操作。对于慢速驱动器为100； 200用于旋转驱动器；适用于SSD的1000-2000；乘以RAID因子。
( sync_binlog ) = 0-使用1来增加安全性，但I / O = 1的代价可能会导致很多“查询结束”； = 0可能会导致“ binlog在不可能的位置”并在崩溃时丢失交易，但速度更快。
( innodb_print_all_deadlocks ) = innodb_print_all_deadlocks = OFF-是否记录所有死锁。
-如果您遇到死锁困扰，请将其打开。警告：如果您有很多死锁，则可能会在磁盘上写入很多内容。
( innodb_buffer_pool_populate ) = OFF = 0-NUMA控件
( default_storage_engine ) = default_storage_engine = MyISAM
-MyISAM已被弃用，并且大多数情况不如InnoDB
( local_infile ) = local_infile = ON
-local_infile = ON是潜在的安全问题
( query_cache_size ) = 128M-质量控制的大小
-太小=没有太大用处。太大=过多的开销。推荐0或不超过50M。
( Created_tmp_disk_tables ) = 15,777 / 11063 = 1.4 /sec-创建 disk “ temp”表作为复杂SELECT的一部分的频率
-增加tmp_table_size和max_heap_table_size。
在使用MEMORY代替MyISAM时检查临时表的规则。较小的架构或查询更改也许可以避免使用MyISAM。
更好的索引和重新编制查询更有可能会有所帮助。
( Created_tmp_disk_tables / Questions ) = 15,777 / 104672 = 15.1%-需要磁盘tmp表的查询的百分比。
-更好的索引/无斑点/等。
( Created_tmp_disk_tables / Created_tmp_tables ) = 15,777 / 33066 = 47.7%-溢出到磁盘的临时表的百分比
-也许增加tmp_table_size和max_heap_table_size;改善指标；避免斑点等。
( Select_full_join / Com_select ) = 6,864 / 55356 = 12.4%-无索引连接的选择的百分比
-向JOIN中使用的表添加合适的索引。
( Select_scan ) = 17,137 / 11063 = 1.5 /sec-全表扫描
-添加索引/优化查询（除非它们是很小的表）
( Select_scan / Com_select ) = 17,137 / 55356 = 31.0%-执行全表扫描的选择的百分比。 （可能会被存储例程欺骗。）
-添加索引/优化查询
( binlog_format ) = binlog_format = MIXED-STATEMENT / ROW / MIXED。 ROW是首选；它可能会成为默认值。
( expire_logs_days ) = 3-自动清除二进制日志的时间（在这几天之后）
-太大（或为零）=占用磁盘空间；太小=需要快速响应网络/计算机崩溃。
（如果log_bin = OFF不相关）
( wsrep_on ) = wsrep_on = OFF-Galera：打开复制
-为什么关闭？
( innodb_autoinc_lock_mode ) = 1-加莱拉：欲望2-2 =“交错”； 1 =“连续”是典型的； 0 =“传统”。
( wsrep_log_conflicts ) = wsrep_log_conflicts = OFF-如果在COMMIT期间遇到死锁冲突，则此标志可能会有所帮助。
( slow_query_log ) = slow_query_log = OFF-是否记录慢查询。 （5.1.12）
( long_query_time ) = 10-截止（秒），用于定义“慢速”查询。
-建议2
( Subquery_cache_hit / ( Subquery_cache_hit + Subquery_cache_miss ) ) = 10 / ( 10 + 1074 ) = 0.92%-子查询缓存命中率
-考虑设置SET Optimizer_switch ='subquery_cache = off';
异常小：
Acl_users = 5
Com_show_fields = 0
Com_show_tables = 0
Handler_read_rnd_next / Handler_read_rnd = 6.13
Innodb_buffer_pool_write_requests / Innodb_buffer_pool_pages_flushed = 2.12
Key_blocks_used = 0
Key_read_requests = 0
Table_locks_immediate = 6.5 /HR
eq_range_index_dive_limit = 0 (always use index dives)
innodb_log_block_size = 0 (Deprecated as of MariaDB 10.2.6)
innodb_max_bitmap_file_size = 0
innodb_max_changed_pages = 0
innodb_mirrored_log_groups = 0
innodb_sched_priority_cleaner = 0
innodb_show_locks_held = 0
lock_wait_timeout = 86,400
异常大：
((query_cache_size - Qcache_free_memory) / Qcache_queries_in_cache) / query_cache_min_res_unit = 6.67
(query_cache_size - Qcache_free_memory) / Qcache_queries_in_cache = 27,332
Aria_pagecache_writes = 11 /sec
Com_create_temporary_table = 0.65 /HR
Com_load = 0.65 /HR
Innodb_buffer_pool_bytes_data = 816674 /sec
Qcache_total_blocks * query_cache_min_res_unit / Qcache_queries_in_cache = 157,586
binlog_cache_size = 3.15e+7
group_concat_max_len = 1.05e+6
innodb_adaptive_hash_index_partitions = 8
innodb_background_scrub_data_check_interval = 0.33 /sec
innodb_background_scrub_data_interval = 55 /sec
max_relay_log_size = 1024MB
thread_concurrency = 12
异常字符串：
binlog_annotate_row_events = ON
ft_boolean_syntax = + -><()~*:\"\"&
innodb_corrupt_table_action = deprecated
innodb_defragment = ON
innodb_fast_shutdown = 1
innodb_locking_fake_changes = OFF
innodb_use_atomic_writes = ON
innodb_use_global_flush_log_at_trx_commit = OFF
innodb_use_trim = ON
log_slow_admin_statements = ON
log_slow_slave_statements = ON
myisam_stats_method = NULLS_UNEQUAL
opt_s__engine_condition_pushdown = off
opt_s__orderby_uses_equalities = on
replicate_annotate_row_events = ON
session_track_system_variables =
答案 1 :(得分：0)
每秒速率= RPS-有关my.cnf [mysqld]部分的建议
thread_cache_size=256 # from 12 for the minimum suggested in REFMAN for 10.nn.nn MariaDB
innodb_io_capacity=1900 # from 200 to enable higher SSD IOPS
innodb_lru_scan_depth=100 # from 512 to reduce CPU cycles used for function
read_buffer_size=512K # from 128K to reduce handler_read_next RPS of 117,695
read_rnd_buffer_size=192K # from 256K to reduce handler_read_rnd_nxt RPS of 4,114
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