Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
===================================== 2026-08-04 01:45:28 0x1aac INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 60 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 7409 srv_active, 0 srv_shutdown, 14863 srv_idle srv_master_thread log flush and writes: 22272 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 5242 OS WAIT ARRAY INFO: signal count 4030 RW-shared spins 2421, rounds 70896, OS waits 2346 RW-excl spins 421, rounds 8588, OS waits 275 RW-sx spins 3, rounds 83, OS waits 2 Spin rounds per wait: 29.28 RW-shared, 20.40 RW-excl, 27.67 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 21621 Purge done for trx's n:o < 21621 undo n:o < 0 state: running but idle History list length 5 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 284615440286344, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440282176, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440278008, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440273840, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440269672, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440265504, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440261336, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284615440257168, 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 16394 OS file reads, 78248 OS file writes, 44407 OS fsyncs 0.28 reads/s, 16384 avg bytes/read, 2.37 writes/s, 0.90 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 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 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) 3.30 hash searches/s, 6.52 non-hash searches/s --- LOG --- Log sequence number 11964496 Log flushed up to 11964496 Pages flushed up to 11964496 Last checkpoint at 11964487 0 pending log flushes, 0 pending chkp writes 22584 log i/o's done, 0.67 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 100160 Buffer pool size 1003 Free buffers 743 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 0, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 16358, created 538, written 48070 0.28 reads/s, 0.07 creates/s, 1.62 writes/s Buffer pool hit rate 987 / 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[73]: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=2500, Main thread ID=952, state: sleeping Number of rows inserted 81, updated 10481, deleted 0, read 226400 0.00 inserts/s, 0.35 updates/s, 0.00 deletes/s, 3.08 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 14703 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================