我最近升级了一个轻型工作（目前仅运行少数几个小型WordPress网站）MAMP服务器（第一个“M”代表“Mac”，它不是MAMP软件包安装，而是通过MacPorts单独安装的源组件）到PHP7和MySQL 5.7，虽然它大部分都很顺利但是我遇到了间歇性的实例，在尝试连接数据库时网站出现错误。使用MySQL 5.5，相同的站点在PHP5.3上运行良好。
通过命令行访问MySQL时出现类似问题（获取错误：2013：在'读取初始通信数据包时失去与MySQL服务器的连接'，系统错误：102尝试连接时），所以我很确定它不是主要的一个PHP7问题。
我已经更新了各种表格（例如，将默认日期从00:00:00更改为CURRENT_TIMESTAMP），并尝试调整一些设置，但我在这个详细程度上有点新鲜。我搜索了一下，并没有提出一个明确的前进道路。我希望你们中的一个人可以查看下面的当前变量设置，并快速查看有什么不妥。
提前致谢！
auto_increment_increment 1
auto_increment_offset 1
autocommit ON
automatic_sp_privileges ON
avoid_temporal_upgrade OFF
back_log 100
basedir /opt/local/
big_tables OFF
bind_address *
binlog_cache_size 32768
binlog_checksum CRC32
binlog_direct_non_transactional_updates OFF
binlog_error_action ABORT_SERVER
binlog_format ROW
binlog_group_commit_sync_delay 0
binlog_group_commit_sync_no_delay_count 0
binlog_gtid_simple_recovery ON
binlog_max_flush_queue_time 0
binlog_order_commits ON
binlog_row_image FULL
binlog_rows_query_log_events OFF
binlog_stmt_cache_size 32768
block_encryption_mode aes-128-ecb
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 utf8
character_set_system utf8
character_sets_dir /opt/local/share/mysql57/charsets/
check_proxy_users OFF
collation_connection utf8_general_ci
collation_database utf8_general_ci
collation_server utf8_general_ci
completion_type NO_CHAIN
concurrent_insert AUTO
connect_timeout 10
core_file OFF
datadir /opt/local/var/db/mysql57/
date_format %Y-%m-%d
datetime_format %Y-%m-%d %H:%i:%s
default_authentication_plugin mysql_native_password
default_password_lifetime 0
default_storage_engine InnoDB
default_tmp_storage_engine InnoDB
default_week_format 0
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
disabled_storage_engines
disconnect_on_expired_password ON
div_precision_increment 4
end_markers_in_json OFF
enforce_gtid_consistency OFF
eq_range_index_dive_limit 200
event_scheduler OFF
expire_logs_days 0
explicit_defaults_for_timestamp OFF
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 /opt/local/var/db/mysql57/254.log
group_concat_max_len 1024
gtid_executed
gtid_executed_compression_period 1000
gtid_mode OFF
gtid_owned
gtid_purged
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 YES
have_statement_timeout YES
have_symlink YES
host_cache_size 378
hostname 254.domain.com
ignore_builtin_innodb OFF
ignore_db_dirs
init_connect
init_file
init_slave
innodb_adaptive_flushing ON
innodb_adaptive_flushing_lwm 10
innodb_adaptive_hash_index ON
innodb_adaptive_hash_index_parts 8
innodb_adaptive_max_sleep_delay 150000
innodb_api_bk_commit_interval 5
innodb_api_disable_rowlock OFF
innodb_api_enable_binlog OFF
innodb_api_enable_mdl OFF
innodb_api_trx_level 0
innodb_autoextend_increment 64
innodb_autoinc_lock_mode 1
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 1
innodb_buffer_pool_load_abort OFF
innodb_buffer_pool_load_at_startup ON
innodb_buffer_pool_load_now OFF
innodb_buffer_pool_size 268435456
innodb_change_buffer_max_size 25
innodb_change_buffering all
innodb_checksum_algorithm crc32
innodb_checksums ON
innodb_cmp_per_index_enabled OFF
innodb_commit_concurrency 0
innodb_compression_failure_threshold_pct 5
innodb_compression_level 6
innodb_compression_pad_pct_max 50
innodb_concurrency_tickets 5000
innodb_data_file_path ibdata1:12M:autoextend
innodb_data_home_dir
innodb_deadlock_detect ON
innodb_default_row_format dynamic
innodb_disable_sort_file_cache OFF
innodb_doublewrite ON
innodb_fast_shutdown 1
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 1
innodb_flush_method
innodb_flush_neighbors 1
innodb_flush_sync ON
innodb_flushing_avg_loops 30
innodb_force_load_corrupted OFF
innodb_force_recovery 0
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_io_capacity 200
innodb_io_capacity_max 2000
innodb_large_prefix ON
innodb_lock_wait_timeout 50
innodb_locks_unsafe_for_binlog OFF
innodb_log_buffer_size 16777216
innodb_log_checksums ON
innodb_log_compressed_pages ON
innodb_log_file_size 67108864
innodb_log_files_in_group 2
innodb_log_group_home_dir ./
innodb_log_write_ahead_size 8192
innodb_lru_scan_depth 1024
innodb_max_dirty_pages_pct 75.000000
innodb_max_dirty_pages_pct_lwm 0.000000
innodb_max_purge_lag 0
innodb_max_purge_lag_delay 0
innodb_max_undo_log_size 1073741824
innodb_monitor_disable
innodb_monitor_enable
innodb_monitor_reset
innodb_monitor_reset_all
innodb_old_blocks_pct 37
innodb_old_blocks_time 1000
innodb_online_alter_log_max_size 134217728
innodb_open_files 2000
innodb_optimize_fulltext_only OFF
innodb_page_cleaners 1
innodb_page_size 16384
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 4
innodb_read_only OFF
innodb_replication_delay 0
innodb_rollback_on_timeout OFF
innodb_rollback_segments 128
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_on_metadata OFF
innodb_stats_persistent ON
innodb_stats_persistent_sample_pages 20
innodb_stats_sample_pages 8
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 ./
innodb_undo_log_truncate OFF
innodb_undo_logs 128
innodb_undo_tablespaces 0
innodb_use_native_aio OFF
innodb_version 5.7.17
innodb_write_io_threads 4
interactive_timeout 28800
internal_tmp_disk_storage_engine InnoDB
join_buffer_size 262144
keep_files_on_create OFF
key_buffer_size 8388608
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
lc_messages en_US
lc_messages_dir /opt/local/share/mysql57/
lc_time_names en_US
license GPL
local_infile ON
lock_wait_timeout 31536000
locked_in_memory OFF
log_bin OFF
log_bin_basename
log_bin_index
log_bin_trust_function_creators OFF
log_bin_use_v1_row_events OFF
log_builtin_as_identified_by_password OFF
log_error stderr
log_error_verbosity 3
log_output FILE
log_queries_not_using_indexes OFF
log_slave_updates OFF
log_slow_admin_statements OFF
log_slow_slave_statements OFF
log_statements_unsafe_for_binlog ON
log_syslog OFF
log_syslog_facility daemon
log_syslog_include_pid ON
log_syslog_tag
log_throttle_queries_not_using_indexes 0
log_timestamps UTC
log_warnings 2
long_query_time 10.000000
low_priority_updates OFF
lower_case_file_system ON
lower_case_table_names 2
master_info_repository FILE
master_verify_checksum OFF
max_allowed_packet 4194304
max_binlog_cache_size 18446744073709547520
max_binlog_size 1073741824
max_binlog_stmt_cache_size 18446744073709547520
max_connect_errors 100
max_connections 250
max_delayed_threads 20
max_digest_length 1024
max_error_count 64
max_execution_time 0
max_heap_table_size 33554432
max_insert_delayed_threads 20
max_join_size 18446744073709551615
max_length_for_sort_data 1024
max_points_in_geometry 65536
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
metadata_locks_cache_size 1024
metadata_locks_hash_instances 8
min_examined_row_limit 0
multi_range_count 256
myisam_data_pointer_size 6
myisam_max_sort_file_size 9223372036853727232
myisam_mmap_size 18446744073709551615
myisam_recover_options OFF
myisam_repair_threads 1
myisam_sort_buffer_size 8388608
myisam_stats_method nulls_unequal
myisam_use_mmap OFF
mysql_native_password_proxy_users OFF
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
new OFF
ngram_token_size 2
offline_mode OFF
old OFF
old_alter_table OFF
old_passwords 0
open_files_limit 5000
optimizer_prune_level 1
optimizer_search_depth 62
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on
optimizer_trace enabled=off,one_line=off
optimizer_trace_features greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on
optimizer_trace_limit 1
optimizer_trace_max_mem_size 16384
optimizer_trace_offset -1
parser_max_mem_size 18446744073709551615
performance_schema ON
performance_schema_accounts_size -1
performance_schema_digests_size 10000
performance_schema_events_stages_history_long_size 10000
performance_schema_events_stages_history_size 10
performance_schema_events_statements_history_long_size 10000
performance_schema_events_statements_history_size 10
performance_schema_events_transactions_history_long_size 10000
performance_schema_events_transactions_history_size 10
performance_schema_events_waits_history_long_size 10000
performance_schema_events_waits_history_size 10
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 80
performance_schema_max_file_handles 32768
performance_schema_max_file_instances -1
performance_schema_max_index_stat -1
performance_schema_max_memory_classes 320
performance_schema_max_metadata_locks -1
performance_schema_max_mutex_classes 200
performance_schema_max_mutex_instances -1
performance_schema_max_prepared_statements_instances -1
performance_schema_max_program_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_sql_text_length 1024
performance_schema_max_stage_classes 150
performance_schema_max_statement_classes 193
performance_schema_max_statement_stack 10
performance_schema_max_table_handles -1
performance_schema_max_table_instances -1
performance_schema_max_table_lock_stat -1
performance_schema_max_thread_classes 50
performance_schema_max_thread_instances -1
performance_schema_session_connect_attrs_size 512
performance_schema_setup_actors_size -1
performance_schema_setup_objects_size -1
performance_schema_users_size -1
pid_file /opt/local/var/db/mysql57/254.sustainablesources.pid
plugin_dir /opt/local/lib/mysql57/plugin/
port 0
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 1048576
query_cache_type OFF
query_cache_wlock_invalidate OFF
query_prealloc_size 8192
range_alloc_block_size 4096
range_optimizer_max_mem_size 8388608
rbr_exec_mode STRICT
read_buffer_size 131072
read_only OFF
read_rnd_buffer_size 262144
relay_log
relay_log_basename /opt/local/var/db/mysql57/254-relay-bin
relay_log_index /opt/local/var/db/mysql57/254-relay-bin.index
relay_log_info_file relay-log.info
relay_log_info_repository FILE
relay_log_purge ON
relay_log_recovery OFF
relay_log_space_limit 0
report_host
report_password
report_port 0
report_user
require_secure_transport OFF
rpl_stop_slave_timeout 31536000
secure_auth ON
secure_file_priv /opt/local/var/db/mysql57-files/
server_id 0
server_id_bits 32
server_uuid ebdb8ee8-be4c-11e6-8ec5-97f60e5fb56e
session_track_gtids OFF
session_track_schema ON
session_track_state_change OFF
session_track_system_variables time_zone,autocommit,character_set_client,character_set_results,character_set_connection
session_track_transaction_info OFF
sha256_password_auto_generate_rsa_keys ON
sha256_password_private_key_path private_key.pem
sha256_password_proxy_users OFF
sha256_password_public_key_path public_key.pem
show_compatibility_56 OFF
show_old_temporals OFF
skip_external_locking ON
skip_name_resolve ON
skip_networking ON
skip_show_database OFF
slave_allow_batching OFF
slave_checkpoint_group 512
slave_checkpoint_period 300
slave_compressed_protocol OFF
slave_exec_mode STRICT
slave_load_tmpdir /var/folders/zz/zyxvpxvq6csfxvn_n000009800002_/T/
slave_max_allowed_packet 1073741824
slave_net_timeout 60
slave_parallel_type DATABASE
slave_parallel_workers 0
slave_pending_jobs_size_max 16777216
slave_preserve_commit_order OFF
slave_rows_search_algorithms TABLE_SCAN,INDEX_SCAN
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 /opt/local/var/db/mysql57/254-slow.log
socket /opt/local/var/run/mysql57/mysqld.sock
sort_buffer_size 262144
sql_auto_is_null OFF
sql_big_selects ON
sql_buffer_result OFF
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 18446744073709551615
sql_slave_skip_counter 0
sql_warnings OFF
ssl_ca ca.pem
ssl_capath
ssl_cert server-cert.pem
ssl_cipher
ssl_crl
ssl_crlpath
ssl_key server-key.pem
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 CST
table_definition_cache 1400
table_open_cache 2000
table_open_cache_instances 16
thread_cache_size 10
thread_handling one-thread-per-connection
thread_stack 262144
time_format %H:%i:%s
time_zone SYSTEM
tls_version TLSv1,TLSv1.1,TLSv1.2
tmp_table_size 33554432
tmpdir /var/folders/zz/zyxvpxvq6csfxvn_n000009800002_/T/
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
transaction_write_set_extraction OFF
tx_isolation REPEATABLE-READ
tx_read_only OFF
unique_checks ON
updatable_views_with_limit YES
validate_password_check_user_name OFF
validate_password_dictionary_file
validate_password_length 8
validate_password_mixed_case_count 1
validate_password_number_count 1
validate_password_policy MEDIUM
validate_password_special_char_count 1
version 5.7.17
version_comment Source distribution
version_compile_machine x86_64
version_compile_os osx10.12
wait_timeout 28800
更新2/15：我在今天早上将wait_timeout加倍到57600并将connect_timeout加倍到20，这是基于其他线程中的一些反馈。我还应该增加interactive_timeout吗？由于这些变化，我应该注意哪些负面影响？