Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-09-28 12:16:39 0x1d00 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 34 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 4522 srv_active, 0 srv_shutdown, 68288 srv_idle
srv_master_thread log flush and writes: 72810
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 5537
OS WAIT ARRAY INFO: signal count 6162
RW-shared spins 22348, rounds 246926, OS waits 4080
RW-excl spins 3612, rounds 32030, OS waits 828
RW-sx spins 11, rounds 168, OS waits 5
Spin rounds per wait: 11.05 RW-shared, 8.87 RW-excl, 15.27 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 2108639
Purge done for trx's n:o < 2108639 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---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 283222922011416, 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 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
867246 OS file reads, 33926 OS file writes, 14982 OS fsyncs
1.88 reads/s, 16384 avg bytes/read, 2.06 writes/s, 1.94 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 294, seg size 296, 7103 merges
merged operations:
 insert 11697, delete mark 820, delete 517
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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
7.06 hash searches/s, 19.12 non-hash searches/s
---
LOG
---
Log sequence number 7595935268
Log flushed up to   7595935248
Pages flushed up to 7595879664
Last checkpoint at  7595877214
0 pending log flushes, 0 pending chkp writes
7784 log i/o's done, 1.62 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 2852056
Buffer pool size   1003
Free buffers       730
Database pages     266
Old database pages 0
Modified db pages  100
Percent of dirty pages(LRU & free pages): 10.030
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 202895, not young 43107921
0.00 youngs/s, 0.00 non-youngs/s
Pages read 866101, created 354, written 24122
1.88 reads/s, 0.00 creates/s, 0.29 writes/s
Buffer pool hit rate 980 / 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[824]:cur[12], 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 3286, updated 2711, deleted 81, read 128928578
0.00 inserts/s, 1.41 updates/s, 0.00 deletes/s, 134.70 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 103904
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 66.29 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================