Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
===================================== 2026-10-31 14:48:47 0x2e5c INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 3 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 7421 srv_active, 0 srv_shutdown, 13912 srv_idle srv_master_thread log flush and writes: 21333 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 66570 OS WAIT ARRAY INFO: signal count 9418 RW-shared spins 3459, rounds 102486, OS waits 3393 RW-excl spins 214, rounds 5195, OS waits 169 RW-sx spins 2, rounds 60, OS waits 2 Spin rounds per wait: 29.63 RW-shared, 24.28 RW-excl, 30.00 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 342327 Purge done for trx's n:o < 342327 undo n:o < 0 state: running History list length 1 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 284207983542920, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983534584, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983526248, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983517912, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983530416, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983522080, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983513744, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284207983538752, 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 43500 OS file reads, 83373 OS file writes, 49155 OS fsyncs 5.00 reads/s, 16384 avg bytes/read, 36.99 writes/s, 5.00 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 0, seg size 2, 67 merges merged operations: insert 67, 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) 50.65 hash searches/s, 50.65 non-hash searches/s --- LOG --- Log sequence number 203474387 Log flushed up to 203474367 Pages flushed up to 203470200 Last checkpoint at 203468884 0 pending log flushes, 0 pending chkp writes 26365 log i/o's done, 2.33 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 913960 Buffer pool size 1003 Free buffers 729 Database pages 266 Old database pages 0 Modified db pages 15 Percent of dirty pages(LRU & free pages): 1.506 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 273, not young 10836 0.00 youngs/s, 0.00 non-youngs/s Pages read 43132, created 736, written 48400 5.00 reads/s, 0.33 creates/s, 33.32 writes/s Buffer pool hit rate 977 / 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: 266, unzip_LRU len: 0 I/O sum[738]:cur[8], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=3896, Main thread ID=6500, state: sleeping Number of rows inserted 204, updated 11518, deleted 6, read 2656749 0.00 inserts/s, 1.33 updates/s, 0.00 deletes/s, 49.32 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 53701 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================