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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 13:24:14 0x460 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 49 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 8143 srv_active, 0 srv_shutdown, 2019036 srv_idle srv_master_thread log flush and writes: 2027179 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 826437 --Thread 2808 has waited at srv0srv.cc line 900 for 0.00 seconds the semaphore: Mutex at 00007FF63BCC5450, Mutex SRV_SYS created srv0srv.cc:1005, lock var 2 --Thread 112 has waited at srv0srv.cc line 900 for 0.00 seconds the semaphore: Mutex at 00007FF63BCC5450, Mutex SRV_SYS created srv0srv.cc:1005, lock var 2 --Thread 3236 has waited at srv0srv.cc line 900 for 0.00 seconds the semaphore: Mutex at 00007FF63BCC5450, Mutex SRV_SYS created srv0srv.cc:1005, lock var 2 OS WAIT ARRAY INFO: signal count 136631 RW-shared spins 10055, rounds 291585, OS waits 8192 RW-excl spins 4906, rounds 22795, OS waits 365 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 3010844 Purge done for trx's n:o < 3010844 undo n:o < 0 state: running History list length 8 LIST OF TRANSACTIONS FOR EACH SESSION: ---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 281877045604640, 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 39379 OS file reads, 279773 OS file writes, 107304 OS fsyncs 1.29 reads/s, 16384 avg bytes/read, 4.51 writes/s, 1.69 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) 7.61 hash searches/s, 10.90 non-hash searches/s --- LOG --- Log sequence number 173663832 Log flushed up to 173663832 Pages flushed up to 173663832 Last checkpoint at 173644815 0 pending log flushes, 0 pending chkp writes 72899 log i/o's done, 1.06 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 280448 Buffer pool size 1003 Free buffers 739 Database pages 256 Old database pages 0 Modified db pages 0 Percent of dirty pages(LRU & free pages): 0.000 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 39284, created 3455, written 193293 1.29 reads/s, 0.02 creates/s, 3.22 writes/s Buffer pool hit rate 978 / 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: 256, unzip_LRU len: 0 I/O sum[212]:cur[9], 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 47005, deleted 868, read 3821018 0.00 inserts/s, 0.88 updates/s, 0.00 deletes/s, 18.16 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 ============================