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 10:25:20 0x7f8cf475a640 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 53 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 598857 srv_active, 0 srv_shutdown, 1561499 srv_idle
srv_master_thread log flush and writes: 2160261
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3619567
OS WAIT ARRAY INFO: signal count 2124578
RW-shared spins 666037, rounds 19975321, OS waits 651076
RW-excl spins 2655, rounds 78143, OS waits 2451
RW-sx spins 14, rounds 366, OS waits 11
Spin rounds per wait: 29.99 RW-shared, 29.43 RW-excl, 26.14 RW-sx
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TRANSACTIONS
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Trx id counter 3427022
Purge done for trx's n:o < 3427022 undo n:o < 0 state: running
History list length 8
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421718385021672, 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 421718385017456, 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
1374929 OS file reads, 6821803 OS file writes, 4554716 OS fsyncs
3.30 reads/s, 16384 avg bytes/read, 12.19 writes/s, 5.91 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 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)
Hash table size 4441, node heap has 1 buffer(s)
15.72 hash searches/s, 30.96 non-hash searches/s
---
LOG
---
Log sequence number 1138392849
Log flushed up to   1138392829
Pages flushed up to 1138391675
Last checkpoint at  1138368824
0 pending log flushes, 0 pending chkp writes
2655863 log i/o's done, 3.43 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 178120
Buffer pool size   1002
Free buffers       738
Database pages     256
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 1374848, created 28471, written 3488591
6.00 reads/s, 0.00 creates/s, 21.33 writes/s
Buffer pool hit rate 978 / 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: 256, unzip_LRU len: 0
I/O sum[537]:cur[51], 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 732403, deleted 0, read 48281686
0.00 inserts/s, 2.13 updates/s, 0.00 deletes/s, 55.62 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1001322
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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