Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-04-18 18:54:45 0x10d18 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 53 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 194102 srv_active, 0 srv_shutdown, 727505 srv_idle
srv_master_thread log flush and writes: 921590
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3570990
OS WAIT ARRAY INFO: signal count 1996168
RW-shared spins 1946572, rounds 60319038, OS waits 1863527
RW-excl spins 643143, rounds 18801463, OS waits 571615
RW-sx spins 3886, rounds 29478, OS waits 452
Spin rounds per wait: 30.99 RW-shared, 29.23 RW-excl, 7.59 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 5782734
Purge done for trx's n:o < 5782734 undo n:o < 0 state: running
History list length 26
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283577137072096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137067928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137063760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137059592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137055424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137051256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137047088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137042920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137038752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137034584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137030416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137026248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137022080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137017912, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137013744, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137009576, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137005408, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577137001240, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136997072, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136992904, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136988736, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136984568, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136976232, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136972064, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136967896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136963728, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283577136980400, 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
3294678 OS file reads, 12893889 OS file writes, 3080279 OS fsyncs
10.25 reads/s, 16384 avg bytes/read, 32.68 writes/s, 7.62 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 3, seg size 5, 4976 merges
merged operations:
 insert 7088, delete mark 3437, delete 1091
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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
20.83 hash searches/s, 13.75 non-hash searches/s
---
LOG
---
Log sequence number 1273568895
Log flushed up to   1273568895
Pages flushed up to 1273568895
Last checkpoint at  1273552937
0 pending log flushes, 0 pending chkp writes
2184848 log i/o's done, 5.42 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 1066704
Buffer pool size   1003
Free buffers       737
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 4784, not young 1283640
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3294633, created 61087, written 10276564
10.25 reads/s, 0.08 creates/s, 26.24 writes/s
Buffer pool hit rate 942 / 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[1843]: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=3892, Main thread ID=2380, state: sleeping
Number of rows inserted 200731, updated 2888540, deleted 15900, read 163881467
0.00 inserts/s, 8.13 updates/s, 0.00 deletes/s, 23.58 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 467011
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================