Storage engines

InnoDB

Supports transactions, row-level locking, foreign keys and encryption for tables

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-09-28 11:57:47 0x1b2c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 49 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 4255 srv_active, 0 srv_shutdown, 67432 srv_idle
srv_master_thread log flush and writes: 71687
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 5145
OS WAIT ARRAY INFO: signal count 5791
RW-shared spins 21045, rounds 231268, OS waits 3795
RW-excl spins 3367, rounds 30077, OS waits 784
RW-sx spins 7, rounds 95, OS waits 3
Spin rounds per wait: 10.99 RW-shared, 8.93 RW-excl, 13.57 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 2105557
Purge done for trx's n:o < 2105557 undo n:o < 0 state: running but idle
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283222922086440, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922082272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922078104, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922007248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922011416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922015584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921990576, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922073936, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922019752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922069768, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922065600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922061432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922057264, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922053096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922048928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922044760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922040592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922036424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922028088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922032256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922003080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921973904, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222922023920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921998912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921994744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921986408, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921982240, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283222921978072, 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
819304 OS file reads, 26233 OS file writes, 11940 OS fsyncs
17.31 reads/s, 16384 avg bytes/read, 3.88 writes/s, 1.47 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 294, seg size 296, 6586 merges
merged operations:
 insert 10875, delete mark 520, delete 358
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 4441, node heap has 2 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 2 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 3 buffer(s)
8596.62 hash searches/s, 208.83 non-hash searches/s
---
LOG
---
Log sequence number 7593465006
Log flushed up to   7593464986
Pages flushed up to 7593461436
Last checkpoint at  7593413330
0 pending log flushes, 0 pending chkp writes
5770 log i/o's done, 1.02 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 2852056
Buffer pool size   1003
Free buffers       732
Database pages     259
Old database pages 0
Modified db pages  9
Percent of dirty pages(LRU & free pages): 0.907
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 195079, not young 41852193
33.67 youngs/s, 2000.29 non-youngs/s
Pages read 818159, created 250, written 18846
17.31 reads/s, 0.04 creates/s, 2.69 writes/s
Buffer pool hit rate 999 / 1000, young-making rate 1 / 1000 not 73 / 1000
Pages read ahead 1.92/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 259, unzip_LRU len: 0
I/O sum[895]:cur[35], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=6844, Main thread ID=3092, state: sleeping
Number of rows inserted 3151, updated 1189, deleted 39, read 125279282
0.00 inserts/s, 0.84 updates/s, 0.00 deletes/s, 14646.46 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 74206
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================