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Storage engines

InnoDB Documentation

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

[ Variables | Buffer Pool | InnoDB Status ] 


=====================================
2026-09-29 21:24:11 0x74c5bc587640 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 15 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 2815 srv_active, 0 srv_shutdown, 91482 srv_idle
srv_master_thread log flush and writes: 94297
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 13883
OS WAIT ARRAY INFO: signal count 8673
RW-shared spins 775, rounds 22074, OS waits 732
RW-excl spins 41, rounds 693, OS waits 22
RW-sx spins 2, rounds 40, OS waits 1
Spin rounds per wait: 28.48 RW-shared, 16.90 RW-excl, 20.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 28529387
Purge done for trx's n:o < 28529387 undo n:o < 0 state: running
History list length 15
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 409867612029312, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---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
38580 OS file reads, 58090 OS file writes, 32229 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.53 writes/s, 0.53 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 1 buffer(s)
Hash table size 1106407, node heap has 34 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)
1.00 hash searches/s, 1.67 non-hash searches/s
---
LOG
---
Log sequence number 100827633939
Log flushed up to   100827633919
Pages flushed up to 100827627938
Last checkpoint at  100827627929
0 pending log flushes, 0 pending chkp writes
25311 log i/o's done, 0.53 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 5133828096
Dictionary memory allocated 13473680
Buffer pool size   256864
Free buffers       223579
Database pages     33170
Old database pages 12402
Modified db pages  13
Percent of dirty pages(LRU & free pages): 0.005
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 32921, created 249, written 29544
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: 33170, 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       27807
Database pages     4286
Old database pages 1602
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 4209, created 77, written 6676
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: 4286, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size   32108
Free buffers       28056
Database pages     4039
Old database pages 1510
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 4028, created 11, written 819
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: 4039, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size   32108
Free buffers       28156
Database pages     3942
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 3942, 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: 3942, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size   32108
Free buffers       27869
Database pages     4224
Old database pages 1579
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.016
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 4197, created 27, written 9299
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: 4224, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 4
Buffer pool size   32108
Free buffers       27903
Database pages     4191
Old database pages 1567
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 4191, created 0, written 5306
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: 4191, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 5
Buffer pool size   32108
Free buffers       28098
Database pages     4002
Old database pages 1497
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 3996, created 6, written 3202
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: 4002, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 6
Buffer pool size   32108
Free buffers       27884
Database pages     4210
Old database pages 1574
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 4147, created 63, written 1136
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 4210, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 7
Buffer pool size   32108
Free buffers       27806
Database pages     4276
Old database pages 1598
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.009
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 4211, created 65, written 3106
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: 4276, 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 21203, deleted 0, read 1250748
0.00 inserts/s, 0.33 updates/s, 0.00 deletes/s, 0.60 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 67969
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================