Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-26 12:09:15 0x7f8cf9fb4640 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 61 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 600505 srv_active, 0 srv_shutdown, 1566049 srv_idle
srv_master_thread log flush and writes: 2166458
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3622586
OS WAIT ARRAY INFO: signal count 2127322
RW-shared spins 667777, rounds 20027521, OS waits 652770
RW-excl spins 2675, rounds 78751, OS waits 2468
RW-sx spins 14, rounds 366, OS waits 11
Spin rounds per wait: 29.99 RW-shared, 29.44 RW-excl, 26.14 RW-sx
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TRANSACTIONS
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Trx id counter 3435534
Purge done for trx's n:o < 3435534 undo n:o < 0 state: running
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421718385017456, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421718385013240, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421718385009024, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421718385004808, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421718385000592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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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
1380621 OS file reads, 6843910 OS file writes, 4568280 OS fsyncs
1.18 reads/s, 16384 avg bytes/read, 2.38 writes/s, 1.61 fsyncs/s
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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 2 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)
4.33 hash searches/s, 5.90 non-hash searches/s
---
LOG
---
Log sequence number 1142181469
Log flushed up to   1142181449
Pages flushed up to 1142180271
Last checkpoint at  1142180262
0 pending log flushes, 0 pending chkp writes
2663945 log i/o's done, 0.92 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 178120
Buffer pool size   1002
Free buffers       734
Database pages     259
Old database pages 0
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.302
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 1380540, created 28594, written 3500579
0.56 reads/s, 0.00 creates/s, 0.84 writes/s
Buffer pool hit rate 962 / 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: 259, unzip_LRU len: 0
I/O sum[104]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=4164158, Main thread ID=140242937955904, state: sleeping
Number of rows inserted 88, updated 735370, deleted 0, read 48431075
0.00 inserts/s, 0.25 updates/s, 0.00 deletes/s, 30.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1005456
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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