Mysql 提交有时需要几分钟才能完成

Question

我已经有这个问题超过 1 周了。我已经解决了其他人在 stackoverflow 上遇到的类似问题。我正在运行 Mysql 5.6.10。

1. "query end" step very long at random times
2. UPDATE statements are in "query end state"
3. Lots of "Query End" states in MySQL, all connections used in a matter of minutes

它随机发生。但是每 5 分钟左右，提交就会花费很长时间。并且事务插入的大小通常在 1-2000 行左右。

我一直在更改设置，我有点失去它我决定在这里创建一个问题。

我的插入/更新是由我的程序生成的 sqlfile。然后我有一个 Windows 服务，每 1.5 分钟运行一次处理文件。我在事务模式下构建了许多 sql 文件的字符串。 5 次中有 4 次运行非常顺畅，但 5 次中有 1 次会卡住。

它通常发生在同一张表上，而且大多数时候它与插入有关，但也发生在更新上。所以我怀疑这与我的表格结构有关，但在解决之前你永远不会知道:)

这是表结构

CREATE TABLE `int_links_root_1` (
  `IntLinksRootId` bigint(20) NOT NULL AUTO_INCREMENT,
  `UrlId` int(11) NOT NULL,
  `Link` varchar(2000) NOT NULL,
  `AnchorText` varchar(500) DEFAULT NULL,
  `Title` varchar(2000) DEFAULT NULL,
  `PageText` varchar(8000) DEFAULT NULL,
  `Added` datetime DEFAULT NULL,
  `LastModifiedDatetime` datetime DEFAULT NULL,
  PRIMARY KEY (`IntLinksRootId`),
  KEY `Int_Links_UrlId_idx_1` (`UrlId`),
  FULLTEXT KEY `FullText` (`AnchorText`,`Title`,`PageText`),
  CONSTRAINT `Int_Links_UrlId_idx_1` FOREIGN KEY (`UrlId`) REFERENCES `urls` (`UrlId`) ON DELETE CASCADE ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=1708708 DEFAULT CHARSET=utf8$$

这些是“显示变量”

auto_increment_increment    1
auto_increment_offset   1
autocommit  ON
automatic_sp_privileges ON
back_log    90
basedir C:/Program Files/MySQL/MySQL Server 5.6/
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character_set_server    latin1
character_set_system    utf8
character_sets_dir  C:\Program Files\MySQL\MySQL Server 5.6\share\charsets\
collation_connection    utf8_general_ci
collation_database  latin1_swedish_ci
collation_server    latin1_swedish_ci
completion_type NO_CHAIN
concurrent_insert   AUTO
connect_timeout 10
core_file   OFF
datadir D:\MySQL6\
date_format %Y-%m-%d
datetime_format %Y-%m-%d %H:%i:%s
default_storage_engine  InnoDB
default_tmp_storage_engine  InnoDB
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slow_query_log_file D:\MySQL6\WIN-0PCCFI7PPIN-slow.log
socket  mysqlpipe6
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sql_big_selects ON
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version 5.6.10-log
version_comment MySQL Community Server (GPL)
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version_compile_os  Win64
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这是演出状态

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Not_flushed_delayed_rows    0
Open_files  22
Open_streams    0
Open_table_definitions  86
Open_tables 96
Opened_files    207
Opened_table_definitions    0
Opened_tables   0
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_locker_lost  0
Performance_schema_mutex_classes_lost   0
Performance_schema_mutex_instances_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_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  10468392
Qcache_hits 0
Qcache_inserts  0
Qcache_lowmem_prunes    0
Qcache_not_cached   107
Qcache_queries_in_cache 0
Qcache_total_blocks 1
Queries 56190
Questions   25
Select_full_join    0
Select_full_range_join  0
Select_range    0
Select_range_check  0
Select_scan 10
Slave_heartbeat_period  
Slave_last_heartbeat    
Slave_open_temp_tables  0
Slave_received_heartbeats   
Slave_retried_transactions  
Slave_running   OFF
Slow_launch_threads 0
Slow_queries    2
Sort_merge_passes   0
Sort_range  0
Sort_rows   1122
Sort_scan   2
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_server_not_after    
Ssl_server_not_before   
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   50440
Table_locks_waited  0
Table_open_cache_hits   4
Table_open_cache_misses 0
Table_open_cache_overflows  0
Tc_log_max_pages_used   0
Tc_log_page_size    0
Tc_log_page_waits   0
Threads_cached  3
Threads_connected   5
Threads_created 8
Threads_running 3
Uptime  3329
Uptime_since_flush_status   3329

我已经尝试了所有不同的 innodb_flush_log_at_trx_commit 设置。我确定我的查询是最佳的，因为它们偶尔会运行得非常快，我几乎可以肯定这与我的冲洗有关。我也尝试禁用自动提交，但它仍然发生。查询缓存被禁用。但任何想法都非常受欢迎。也许我的磁盘太慢了？

系统未投入生产，因此我可以重新启动它并测试任何建议。

如果我可以提供更多详细信息，请告诉我。

Answer 1

你确定之前的提交已经完成了吗？我对 mysql 的内部结构并不熟悉，但它不能重建索引，这对于大表来说真的很慢。或者您可以一次运行多个查询，但第五个查询刚好超出 rhreads 计数，并且在队列中等待休息完成。