Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
===================================== 2026-06-27 07:09:05 0x31eb8 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 49 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 1287 srv_active, 0 srv_shutdown, 1002701 srv_idle srv_master_thread log flush and writes: 1003988 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 8594 OS WAIT ARRAY INFO: signal count 6444 RW-shared spins 3090, rounds 90623, OS waits 3002 RW-excl spins 251, rounds 1831, OS waits 31 RW-sx spins 19, rounds 316, OS waits 6 Spin rounds per wait: 29.33 RW-shared, 7.29 RW-excl, 16.63 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 79540 Purge done for trx's n:o < 79540 undo n:o < 0 state: running but idle History list length 0 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 282994070081680, 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 13065 OS file reads, 24474 OS file writes, 14711 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 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 0 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 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, 0.00 non-hash searches/s --- LOG --- Log sequence number 20977458 Log flushed up to 20977458 Pages flushed up to 20977458 Last checkpoint at 20977449 0 pending log flushes, 0 pending chkp writes 9980 log i/o's done, 0.00 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 380608 Buffer pool size 1003 Free buffers 425 Database pages 573 Old database pages 231 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 176, not young 1732 0.00 youngs/s, 0.00 non-youngs/s Pages read 12907, created 279, written 12874 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: 573, unzip_LRU len: 0 I/O sum[6]:cur[0], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=217672, Main thread ID=97272, state: sleeping Number of rows inserted 1260, updated 1292, deleted 322, read 328066899 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2541.21 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 42150 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================