Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-09-29 19:38:52 0x74c5d32d3640 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 22 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 513 srv_active, 0 srv_shutdown, 87496 srv_idle
srv_master_thread log flush and writes: 88009
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 339
OS WAIT ARRAY INFO: signal count 266
RW-shared spins 239, rounds 7064, OS waits 235
RW-excl spins 1, rounds 30, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.56 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 26749477
Purge done for trx's n:o < 26749477 undo n:o < 0 state: running but idle
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 409867612025096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 409867612020880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
37852 OS file reads, 9929 OS file writes, 5815 OS fsyncs
0.18 reads/s, 16384 avg bytes/read, 8.64 writes/s, 3.73 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 5, seg size 7, 0 merges
merged operations:
 insert 0, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 1106407, node heap has 0 buffer(s)
Hash table size 1106407, node heap has 33 buffer(s)
Hash table size 1106407, node heap has 0 buffer(s)
Hash table size 1106407, node heap has 29 buffer(s)
Hash table size 1106407, node heap has 24 buffer(s)
Hash table size 1106407, node heap has 9 buffer(s)
Hash table size 1106407, node heap has 9 buffer(s)
Hash table size 1106407, node heap has 9 buffer(s)
529.25 hash searches/s, 34.23 non-hash searches/s
---
LOG
---
Log sequence number 100805001658
Log flushed up to   100805001638
Pages flushed up to 100804996820
Last checkpoint at  100804949881
0 pending log flushes, 0 pending chkp writes
4330 log i/o's done, 2.14 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 5133828096
Dictionary memory allocated 13798200
Buffer pool size   256864
Free buffers       224378
Database pages     32373
Old database pages 12104
Modified db pages  9
Percent of dirty pages(LRU & free pages): 0.004
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 32193, created 180, written 4889
0.18 reads/s, 0.09 creates/s, 5.77 writes/s
Buffer pool hit rate 999 / 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: 32373, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
----------------------
INDIVIDUAL BUFFER POOL INFO
----------------------
---BUFFER POOL 0
Buffer pool size   32108
Free buffers       27952
Database pages     4141
Old database pages 1548
Modified db pages  6
Percent of dirty pages(LRU & free pages): 0.019
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 4126, created 15, written 781
0.00 reads/s, 0.00 creates/s, 1.18 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: 4141, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size   32108
Free buffers       28167
Database pages     3929
Old database pages 1468
Modified db pages  1
Percent of dirty pages(LRU & free pages): 0.003
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 3922, created 7, written 119
0.00 reads/s, 0.09 creates/s, 1.14 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: 3929, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size   32108
Free buffers       28256
Database pages     3842
Old database pages 1438
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 3842, created 0, written 0
0.00 reads/s, 0.00 creates/s, 0.00 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: 3842, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size   32108
Free buffers       27981
Database pages     4112
Old database pages 1537
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 4087, created 25, written 1396
0.00 reads/s, 0.00 creates/s, 2.18 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: 4112, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 4
Buffer pool size   32108
Free buffers       27969
Database pages     4125
Old database pages 1542
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 4125, created 0, written 825
0.00 reads/s, 0.00 creates/s, 0.05 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: 4125, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 5
Buffer pool size   32108
Free buffers       28158
Database pages     3943
Old database pages 1475
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 3937, created 6, written 783
0.00 reads/s, 0.00 creates/s, 0.50 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: 3943, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 6
Buffer pool size   32108
Free buffers       27964
Database pages     4130
Old database pages 1544
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 4067, created 63, written 242
0.14 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 997 / 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: 4130, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 7
Buffer pool size   32108
Free buffers       27931
Database pages     4151
Old database pages 1552
Modified db pages  2
Percent of dirty pages(LRU & free pages): 0.006
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 4087, created 64, written 743
0.05 reads/s, 0.00 creates/s, 0.73 writes/s
Buffer pool hit rate 999 / 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: 4151, 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=2556, Main thread ID=128383094601280, state: sleeping
Number of rows inserted 0, updated 3405, deleted 0, read 1202537
0.00 inserts/s, 1.86 updates/s, 0.00 deletes/s, 5.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 62298
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================