MySQL锁表查询不到进程，如何处理

2024-07-10 13:15| 来源: 网络整理| 查看: 265

背景

测试同事通过更新某个表的数据进行功能测试，突然说锁表了，也不知道原因为何，一直用的Navicat，然后用show OPEN TABLES where In_use > 0;命令也查询不到具体的进程ID

常规解决办法查询是否锁表 show OPEN TABLES where In_use > 0; 查询进程 show processlist;

查询到相对应的进程，然后

kill id; 通过查看事务处理查看正在锁的事务 SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS; 查看等待锁的事务 SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCK_WAITS; 通过Innodb处理

在MySQL中有一个方法可以探窥到锁情况，它会打印出所有innodb的信息：

SHOW ENGINE INNODB STATUS;

如下，是通过语句获取到的信息（其中的IP全部用10.10.10.10已替换），后面会简要的进行分析这段文本

===================================== 2019-12-18 11:44:35 7f4f743f4700 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 5 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 60826 srv_active, 0 srv_shutdown, 30696 srv_idle srv_master_thread log flush and writes: 91522 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 9916 OS WAIT ARRAY INFO: signal count 9842 Mutex spin waits 2763, rounds 43928, OS waits 1328 RW-shared spins 8532, rounds 255229, OS waits 8469 RW-excl spins 82, rounds 3658, OS waits 94 Spin rounds per wait: 15.90 mutex, 29.91 RW-shared, 44.61 RW-excl ------------ TRANSACTIONS ------------ Trx id counter 188109012 Purge done for trx's n:o < 188101227 undo n:o < 0 state: running but idle History list length 684 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 0, not started MySQL thread id 2326, OS thread handle 0x7f4f743f4700, query id 915743 10.10.10.10 root init SHOW ENGINE INNODB STATUS ---TRANSACTION 188109010, not started MySQL thread id 2324, OS thread handle 0x7f4f74476700, query id 915731 10.10.10.10 yt_dev cleaning up ---TRANSACTION 0, not started MySQL thread id 2321, OS thread handle 0x7f4f3c0ae700, query id 914695 10.10.10.10 root cleaning up ---TRANSACTION 0, not started MySQL thread id 2319, OS thread handle 0x7f4f4014b700, query id 915351 10.10.10.10 root cleaning up ---TRANSACTION 188108991, not started MySQL thread id 2277, OS thread handle 0x7f4f360f8700, query id 915671 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 0, not started MySQL thread id 2314, OS thread handle 0x7f4f35be4700, query id 912387 10.10.10.10 root cleaning up ---TRANSACTION 188108516, not started MySQL thread id 2275, OS thread handle 0x7f4f745af700, query id 914221 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188108974, not started MySQL thread id 2286, OS thread handle 0x7f4f40312700, query id 915594 10.10.10.10 yt_dev cleaning up ---TRANSACTION 0, not started MySQL thread id 2287, OS thread handle 0x7f4f3c171700, query id 908400 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188108951, not started MySQL thread id 2280, OS thread handle 0x7f4f74372700, query id 915501 10.10.10.10 yt_dev cleaning up ---TRANSACTION 188108970, not started MySQL thread id 2276, OS thread handle 0x7f4f740e8700, query id 915576 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188108004, not started MySQL thread id 2261, OS thread handle 0x7f4f741ec700, query id 915637 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188109011, not started MySQL thread id 2259, OS thread handle 0x7f4f36139700, query id 915739 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188107491, not started MySQL thread id 2251, OS thread handle 0x7f4f36076700, query id 908114 10.10.10.10 yt_dev cleaning up ---TRANSACTION 188105855, not started MySQL thread id 2237, OS thread handle 0x7f4f35e6e700, query id 915667 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188106734, not started MySQL thread id 2191, OS thread handle 0x7f4f3c0ef700, query id 904938 10.10.10.10 yttest_opr cleaning up ---TRANSACTION 188108971, not started MySQL thread id 2220, OS thread handle 0x7f4f4018c700, query id 915685 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188109008, not started MySQL thread id 2180, OS thread handle 0x7f4f3617a700, query id 915721 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188105318, not started MySQL thread id 2132, OS thread handle 0x7f4f4020e700, query id 915614 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 0, not started MySQL thread id 2090, OS thread handle 0x7f4f74066700, query id 849932 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188108998, not started MySQL thread id 1950, OS thread handle 0x7f4f402d1700, query id 915711 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188108968, not started MySQL thread id 1747, OS thread handle 0x7f4f40088700, query id 915566 10.10.10.10 yttest_opr cleaning up ---TRANSACTION 188043721, not started MySQL thread id 1376, OS thread handle 0x7f4f400c9700, query id 915665 10.10.10.10 ytdev_phsp_data cleaning up ---TRANSACTION 188106729, not started MySQL thread id 21, OS thread handle 0x7f4f7416a700, query id 904903 10.10.10.10 yttest_opr cleaning up ---TRANSACTION 188108889, ACTIVE 39 sec starting index read mysql tables in use 1, locked 1 LOCK WAIT 2 lock struct(s), heap size 360, 1 row lock(s) MySQL thread id 2315, OS thread handle 0x7f4f74539700, query id 915249 10.10.10.10 root updating UPDATE `ytphsp_busi_v2`.`app_evaluation` SET `is_visible`='1' WHERE `id`='26' ------- TRX HAS BEEN WAITING 39 SEC FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 5023 page no 3 n bits 104 index `PRIMARY` of table `ytphsp_busi_v2`.`app_evaluation` trx id 188108889 lock_mode X locks rec but not gap waiting Record lock, heap no 31 PHYSICAL RECORD: n_fields 12; compact format; info bits 0 0: len 8; hex 800000000000001a; asc ;; 1: len 6; hex 00000b363265; asc 62e;; 2: len 7; hex 6100000228141d; asc a ( ;; 3: len 8; hex 800000000bebc201; asc ;; 4: len 4; hex 8000000f; asc ;; 5: len 4; hex 80000000; asc ;; 6: SQL NULL; 7: len 4; hex 80000000; asc ;; 8: SQL NULL; 9: SQL NULL; 10: SQL NULL; 11: SQL NULL; ------------------ ---TRANSACTION 188101221, ACTIVE 3405 sec 2 lock struct(s), heap size 360, 1 row lock(s), undo log entries 2 MySQL thread id 2065, OS thread handle 0x7f4f35ca7700, query id 881823 10.10.10.10 ytdev_phsp_data cleaning up Trx read view will not see trx with id >= 188101222, sees < 188101222 -------- FILE I/O -------- I/O thread 0 state: waiting for completed aio requests (insert buffer thread) I/O thread 1 state: waiting for completed aio requests (log thread) I/O thread 2 state: waiting for completed aio requests (read thread) I/O thread 3 state: waiting for completed aio requests (read thread) I/O thread 4 state: waiting for completed aio requests (read thread) I/O thread 5 state: waiting for completed aio requests (read thread) I/O thread 6 state: waiting for completed aio requests (write thread) I/O thread 7 state: waiting for completed aio requests (write thread) I/O thread 8 state: waiting for completed aio requests (write thread) I/O thread 9 state: waiting for completed aio requests (write thread) Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] , ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0 Pending flushes (fsync) log: 0; buffer pool: 0 146414 OS file reads, 68947 OS file writes, 48073 OS fsyncs 0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 1556, seg size 1558, 17 merges merged operations: insert 31, delete mark 15, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 138401, node heap has 187 buffer(s) 803.44 hash searches/s, 57.79 non-hash searches/s --- LOG --- Log sequence number 64441780891 Log flushed up to 64441780891 Pages flushed up to 64441780614 Last checkpoint at 64441780614 0 pending log writes, 0 pending chkp writes 21801 log i/o's done, 0.00 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total memory allocated 68681728; in additional pool allocated 0 Dictionary memory allocated 3026787 Buffer pool size 4096 Free buffers 1025 Database pages 2884 Old database pages 1044 Modified db pages 3 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 9822, not young 3172429 0.00 youngs/s, 0.00 non-youngs/s Pages read 143394, created 910, written 38680 0.00 reads/s, 0.00 creates/s, 0.00 writes/s Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 2884, unzip_LRU len: 0 I/O sum[30]:cur[0], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 1 read views open inside InnoDB Main thread process no. 1229, id 139978308536064, state: sleeping Number of rows inserted 1171, updated 98547, deleted 974, read 21120891 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 863.03 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================

这里面最需要注意的一段就是如下这段，里面有死锁的事务ID，进程ID，能够进一步查询搜寻这段的关键词：

TRX HAS BEEN WAITINGRECORD LOCKS space idTRANSACTIONMySQL thread id ------- TRX HAS BEEN WAITING 39 SEC FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 5023 page no 3 n bits 104 index `PRIMARY` of table `ytphsp_busi_v2`.`app_evaluation` trx id 188108889 lock_mode X locks rec but not gap waiting Record lock, heap no 31 PHYSICAL RECORD: n_fields 12; compact format; info bits 0 0: len 8; hex 800000000000001a; asc ;; 1: len 6; hex 00000b363265; asc 62e;; 2: len 7; hex 6100000228141d; asc a ( ;; 3: len 8; hex 800000000bebc201; asc ;; 4: len 4; hex 8000000f; asc ;; 5: len 4; hex 80000000; asc ;; 6: SQL NULL; 7: len 4; hex 80000000; asc ;; 8: SQL NULL; 9: SQL NULL; 10: SQL NULL; 11: SQL NULL; ------------------ ---TRANSACTION 188101221, ACTIVE 3405 sec 2 lock struct(s), heap size 360, 1 row lock(s), undo log entries 2 MySQL thread id 2065, OS thread handle 0x7f4f35ca7700, query id 881823 10.10.10.10 ytdev_phsp_data cleaning up Trx read view will not see trx with id >= 188101222, sees < 188101222

如上，可以找到事务ID=188101221，进程ID=2065 然后，kill 2065杀掉进程即可

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