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InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
===================================== 2026-03-12 16:12:05 0x7f25d816d700 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 59 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 2739 srv_active, 0 srv_shutdown, 7718 srv_idle srv_master_thread log flush and writes: 10454 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 8096 OS WAIT ARRAY INFO: signal count 6454 RW-shared spins 0, rounds 5535, OS waits 2763 RW-excl spins 0, rounds 572, OS waits 19 RW-sx spins 0, rounds 0, OS waits 0 Spin rounds per wait: 5535.00 RW-shared, 572.00 RW-excl, 0.00 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 46720 Purge done for trx's n:o < 46720 undo n:o < 0 state: running History list length 4 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 421275277197816, not started 0 lock struct(s), heap size 1136, 0 row lock(s) ---TRANSACTION 421275277193560, not started 0 lock struct(s), heap size 1136, 0 row lock(s) ---TRANSACTION 421275277189304, not started 0 lock struct(s), heap size 1136, 0 row lock(s) -------- FILE I/O -------- I/O thread 0 state: waiting for completed aio requests (insert buffer thread) I/O thread 1 state: waiting for completed aio requests (log thread) I/O thread 2 state: waiting for completed aio requests (read thread) I/O thread 3 state: waiting for completed aio requests (read thread) I/O thread 4 state: waiting for completed aio requests (read thread) I/O thread 5 state: waiting for completed aio requests (read thread) I/O thread 6 state: waiting for completed aio requests (write thread) I/O thread 7 state: waiting for completed aio requests (write thread) I/O thread 8 state: waiting for completed aio requests (write thread) I/O thread 9 state: waiting for completed aio requests (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: 0 962 OS file reads, 35071 OS file writes, 19593 OS fsyncs 0.00 reads/s, 0 avg bytes/read, 3.08 writes/s, 1.75 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 69257, node heap has 1 buffer(s) Hash table size 69257, node heap has 10 buffer(s) Hash table size 69257, node heap has 2 buffer(s) Hash table size 69257, node heap has 25 buffer(s) Hash table size 69257, node heap has 1 buffer(s) Hash table size 69257, node heap has 3 buffer(s) Hash table size 69257, node heap has 26 buffer(s) Hash table size 69257, node heap has 0 buffer(s) 1.24 hash searches/s, 0.51 non-hash searches/s --- LOG --- Log sequence number 15207265 Log flushed up to 15207265 Pages flushed up to 15207265 Last checkpoint at 15207256 0 pending log flushes, 0 pending chkp writes 12925 log i/o's done, 1.14 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 285212672 Dictionary memory allocated 130928 Buffer pool size 16024 Free buffers 15003 Database pages 953 Old database pages 365 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 803, created 150, written 19913 0.00 reads/s, 0.02 creates/s, 1.75 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: 953, unzip_LRU len: 0 I/O sum[0]: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=910, Main thread ID=139799801308928, state: sleeping Number of rows inserted 1, updated 4602, deleted 0, read 1293105 0.00 inserts/s, 0.36 updates/s, 0.00 deletes/s, 17.69 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 1547 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================