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Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Biến | Bể bộ đệm | Trạng thái InnoDB ]
===================================== 2026-01-27 13:24:51 0x169c INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 37 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 8148 srv_active, 0 srv_shutdown, 2019067 srv_idle srv_master_thread log flush and writes: 2027215 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 826761 OS WAIT ARRAY INFO: signal count 136671 RW-shared spins 10059, rounds 291705, OS waits 8195 RW-excl spins 4907, rounds 22825, OS waits 366 RW-sx spins 38, rounds 589, OS waits 8 Spin rounds per wait: 29.00 RW-shared, 4.65 RW-excl, 15.50 RW-sx ------------------------ LATEST FOREIGN KEY ERROR ------------------------ 2026-01-26 20:06:37 0xefc Transaction: TRANSACTION 1448285, ACTIVE 0 sec updating or deleting mysql tables in use 1, locked 1 4 lock struct(s), heap size 1128, 2 row lock(s), undo log entries 1 MySQL thread id 1499, OS thread handle 3836, query id 316648 localhost ::1 root Updating DELETE FROM `backup`.`account` WHERE `id` = 11 Foreign key constraint fails for table `backup`.`player`: , CONSTRAINT `player_ibfk_1` FOREIGN KEY (`account_id`) REFERENCES `account` (`id`) Trying to delete or update in parent table, in index PRIMARY tuple: DATA TUPLE: 61 fields; 0: len 4; hex 8000000b; asc ;; 1: len 6; hex 00000016195d; asc ];; 2: len 7; hex 6a000001a92fac; asc j / ;; 3: len 4; hex 74657374; asc test;; 4: len 8; hex 61646d696e393873; asc admin98s;; 5: len 0; hex ; asc ;; 6: len 4; hex 697719a8; asc iw ;; 7: len 4; hex 6977517f; asc iwQ ;; 8: len 2; hex 8000; asc ;; 9: len 4; hex 80000000; asc ;; 10: len 4; hex 80000000; asc ;; 11: len 4; hex 7fffffff; asc ;; 12: len 1; hex 81; asc ;; 13: len 4; hex 6977514a; asc iwQJ;; 14: len 4; hex 69775170; asc iwQp;; 15: len 12; hex 32372e37312e3132312e3531; asc 27.71.121.51;; 16: len 4; hex 80000000; asc ;; 17: len 4; hex 80000000; asc ;; 18: len 4; hex 7fffffff; asc ;; 19: len 8; hex 000000000000f03f; asc ?;; 20: len 1; hex 80; asc ;; 21: len 1; hex 30; asc 0;; 22: SQL NULL; 23: len 4; hex 80000000; asc ;; 24: len 4; hex 80000000; asc ;; 25: len 4; hex 80000000; asc ;; 26: len 4; hex 80000000; asc ;; 27: SQL NULL; 28: len 4; hex 80000000; asc ;; 29: len 4; hex 80000000; asc ;; 30: len 4; hex 80000000; asc ;; 31: len 4; hex 80000000; asc ;; 32: len 4; hex 80000000; asc ;; 33: len 4; hex 80000000; asc ;; 34: len 4; hex 80000000; asc ;; 35: len 4; hex 80000000; asc ;; 36: len 4; hex 80000000; asc ;; 37: len 4; hex 80000000; asc ;; 38: len 4; hex 80000000; asc ;; 39: len 4; hex 80000000; asc ;; 40: len 4; hex 80000000; asc ;; 41: len 4; hex 80000000; asc ;; 42: len 4; hex 80000000; asc ;; 43: len 4; hex 80000000; asc ;; 44: len 4; hex 80000000; asc ;; 45: len 4; hex 80000000; asc ;; 46: len 4; hex 80000000; asc ;; 47: len 4; hex 80000000; asc ;; 48: len 4; hex 80000000; asc ;; 49: len 4; hex 80000000; asc ;; 50: SQL NULL; 51: SQL NULL; 52: len 4; hex 80000000; asc ;; 53: len 8; hex 8000000000000000; asc ;; 54: len 4; hex 80000000; asc ;; 55: len 4; hex 80000004; asc ;; 56: SQL NULL; 57: len 4; hex 80000000; asc ;; 58: SQL NULL; 59: SQL NULL; 60: len 4; hex 80000000; asc ;; But in child table `backup`.`player`, in index account_id, there is a record: PHYSICAL RECORD: n_fields 2; compact format; info bits 0 0: len 4; hex 8000000b; asc ;; 1: len 4; hex 8000000b; asc ;; ------------ TRANSACTIONS ------------ Trx id counter 3010876 Purge done for trx's n:o < 3010872 undo n:o < 0 state: running History list length 4 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 281877045642152, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045604640, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045637984, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045633816, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045629648, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045625480, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045621312, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045617144, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045612976, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045608808, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045596304, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 281877045600472, not started 0 lock struct(s), heap size 1128, 0 row lock(s) -------- FILE I/O -------- I/O thread 0 state: native aio handle (insert buffer thread) I/O thread 1 state: native aio handle (log thread) I/O thread 2 state: native aio handle (read thread) I/O thread 3 state: native aio handle (read thread) I/O thread 4 state: native aio handle (read thread) I/O thread 5 state: native aio handle (read thread) I/O thread 6 state: native aio handle (write thread) I/O thread 7 state: native aio handle (write thread) I/O thread 8 state: native aio handle (write thread) I/O thread 9 state: native aio handle (write thread) Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] , ibuf aio reads:, log i/o's:, sync i/o's: Pending flushes (fsync) log: 0; buffer pool: 0 39408 OS file reads, 279882 OS file writes, 107349 OS fsyncs 0.78 reads/s, 16384 avg bytes/read, 2.95 writes/s, 1.22 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 0, seg size 2, 0 merges merged operations: insert 0, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) 5.54 hash searches/s, 5.81 non-hash searches/s --- LOG --- Log sequence number 173683061 Log flushed up to 173683061 Pages flushed up to 173679669 Last checkpoint at 173678523 0 pending log flushes, 0 pending chkp writes 72927 log i/o's done, 0.76 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 280448 Buffer pool size 1003 Free buffers 736 Database pages 259 Old database pages 0 Modified db pages 7 Percent of dirty pages(LRU & free pages): 0.703 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 119, not young 14158 0.00 youngs/s, 0.00 non-youngs/s Pages read 39313, created 3456, written 193368 0.78 reads/s, 0.03 creates/s, 2.03 writes/s Buffer pool hit rate 981 / 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: 259, unzip_LRU len: 0 I/O sum[207]:cur[3], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=3152, Main thread ID=4168, state: sleeping Number of rows inserted 30724, updated 47021, deleted 868, read 3821590 0.00 inserts/s, 0.43 updates/s, 0.00 deletes/s, 15.46 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 2320 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================