Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
===================================== 2026-07-14 23:19:23 0x301c INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 2 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 9260 srv_active, 0 srv_shutdown, 13272 srv_idle srv_master_thread log flush and writes: 22532 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 21159 OS WAIT ARRAY INFO: signal count 12551 RW-shared spins 10881, rounds 201905, OS waits 4861 RW-excl spins 8846, rounds 18161, OS waits 157 RW-sx spins 210, rounds 1681, OS waits 29 Spin rounds per wait: 18.56 RW-shared, 2.05 RW-excl, 8.00 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 45396 Purge done for trx's n:o < 45396 undo n:o < 0 state: running but idle History list length 2 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 283359865463432, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865459264, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865455096, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865450928, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865446760, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865442592, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865438424, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283359865434256, 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 95609 OS file reads, 128390 OS file writes, 65153 OS fsyncs 3.00 reads/s, 16384 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 0, seg size 2, 152 merges merged operations: insert 925, 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 0 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) 0.00 hash searches/s, 4.00 non-hash searches/s --- LOG --- Log sequence number 170358404 Log flushed up to 170358404 Pages flushed up to 170358404 Last checkpoint at 170358395 0 pending log flushes, 0 pending chkp writes 33611 log i/o's done, 0.00 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 212840 Buffer pool size 1003 Free buffers 735 Database pages 261 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 1556, not young 403768 0.00 youngs/s, 0.00 non-youngs/s Pages read 95394, created 7637, written 83445 3.00 reads/s, 0.00 creates/s, 0.00 writes/s Buffer pool hit rate 454 / 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: 261, unzip_LRU len: 0 I/O sum[62]:cur[6], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=3720, Main thread ID=13284, state: sleeping Number of rows inserted 126988, updated 13964, deleted 0, read 2974660 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2.50 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 33720 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================