Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
===================================== 2026-07-16 12:38:17 0x57d0 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 41 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 9971 srv_active, 0 srv_shutdown, 1070801 srv_idle srv_master_thread log flush and writes: 1080772 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 287573 OS WAIT ARRAY INFO: signal count 146826 RW-shared spins 5386, rounds 162143, OS waits 4953 RW-excl spins 224, rounds 4762, OS waits 151 RW-sx spins 8, rounds 61, OS waits 1 Spin rounds per wait: 30.10 RW-shared, 21.26 RW-excl, 7.62 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 26446 Purge done for trx's n:o < 26446 undo n:o < 0 state: running but idle History list length 1 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 283470802215128, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 283470802210960, 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 21454 OS file reads, 101733 OS file writes, 63352 OS fsyncs 0.68 reads/s, 16384 avg bytes/read, 4.15 writes/s, 2.68 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 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) 4.07 hash searches/s, 10.27 non-hash searches/s --- LOG --- Log sequence number 14896849 Log flushed up to 14896849 Pages flushed up to 14895357 Last checkpoint at 14895270 0 pending log flushes, 0 pending chkp writes 31901 log i/o's done, 1.44 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 155248 Buffer pool size 1003 Free buffers 741 Database pages 256 Old database pages 0 Modified db pages 19 Percent of dirty pages(LRU & free pages): 1.904 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 0, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 21392, created 586, written 59264 0.68 reads/s, 0.00 creates/s, 2.27 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: 256, unzip_LRU len: 0 I/O sum[175]: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=11096, Main thread ID=16636, state: sleeping Number of rows inserted 90, updated 11931, deleted 0, read 282962 0.00 inserts/s, 0.59 updates/s, 0.00 deletes/s, 8.19 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 21390 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================