Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-16 08:15:15 0x31151b000 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 57 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 7143 srv_active, 0 srv_shutdown, 25086 srv_idle
srv_master_thread log flush and writes: 32229
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 57975
OS WAIT ARRAY INFO: signal count 23447
RW-shared spins 2649, rounds 79246, OS waits 2511
RW-excl spins 159, rounds 2875, OS waits 25
RW-sx spins 3, rounds 22, OS waits 0
Spin rounds per wait: 29.92 RW-shared, 18.08 RW-excl, 7.33 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 81643
Purge done for trx's n:o < 81643 undo n:o < 0 state: running
History list length 10
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421965236245352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236241160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236236968, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236232776, not started
mysql tables in use 1, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236228584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236224392, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236220200, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236216008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421965236211816, 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
18353 OS file reads, 74143 OS file writes, 45004 OS fsyncs
5.75 reads/s, 16384 avg bytes/read, 14.47 writes/s, 8.28 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
 insert 0, delete mark 0, delete 0
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 0 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 1 buffer(s)
23.09 hash searches/s, 54.26 non-hash searches/s
---
LOG
---
Log sequence number 45905034
Log flushed up to   45905014
Pages flushed up to 45777124
Last checkpoint at  45769300
0 pending log flushes, 0 pending chkp writes
23431 log i/o's done, 5.72 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 189728
Buffer pool size   1002
Free buffers       738
Database pages     257
Old database pages 0
Modified db pages  156
Percent of dirty pages(LRU & free pages): 15.663
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 18273, created 513, written 42469
5.75 reads/s, 0.18 creates/s, 7.60 writes/s
Buffer pool hit rate 976 / 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: 257, unzip_LRU len: 0
I/O sum[730]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=49381, Main thread ID=13166444544, state: sleeping
Number of rows inserted 116, updated 10935, deleted 35, read 244315
0.00 inserts/s, 4.37 updates/s, 0.00 deletes/s, 97.88 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 46893
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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