Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Variables | Buffer Pool | InnoDB Status ]
===================================== 2026-08-31 19:06:53 0x3ae4 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 37 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 3369 srv_active, 0 srv_shutdown, 1433 srv_idle srv_master_thread log flush and writes: 4802 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 102993 OS WAIT ARRAY INFO: signal count 874 RW-shared spins 1356, rounds 40479, OS waits 554 RW-excl spins 16, rounds 495, OS waits 8 RW-sx spins 0, rounds 0, OS waits 0 Spin rounds per wait: 29.85 RW-shared, 30.94 RW-excl, 0.00 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 33234 Purge done for trx's n:o < 33234 undo n:o < 0 state: running History list length 1 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 284293649216136, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649211968, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649207800, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649203632, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649195296, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649191128, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649199464, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 284293649186960, 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 6524 OS file reads, 32335 OS file writes, 20352 OS fsyncs 1.84 reads/s, 16384 avg bytes/read, 8.46 writes/s, 4.95 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 0 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) 4.24 hash searches/s, 10.11 non-hash searches/s --- LOG --- Log sequence number 12782863 Log flushed up to 12782863 Pages flushed up to 12782863 Last checkpoint at 12777962 0 pending log flushes, 0 pending chkp writes 9929 log i/o's done, 2.24 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 110176 Buffer pool size 1003 Free buffers 742 Database pages 258 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 6475, created 281, written 18815 1.84 reads/s, 0.08 creates/s, 5.30 writes/s Buffer pool hit rate 958 / 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: 258, unzip_LRU len: 0 I/O sum[353]:cur[2], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=13172, Main thread ID=12944, state: sleeping Number of rows inserted 24, updated 3767, deleted 0, read 33453 0.00 inserts/s, 0.97 updates/s, 0.00 deletes/s, 4.11 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 1824 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================