Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-14 17:30:04 0x74c8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 33 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 462 srv_active, 0 srv_shutdown, 69335 srv_idle
srv_master_thread log flush and writes: 69797
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 782
OS WAIT ARRAY INFO: signal count 576
RW-shared spins 394, rounds 11624, OS waits 385
RW-excl spins 72, rounds 371, OS waits 5
RW-sx spins 1, rounds 1, OS waits 0
Spin rounds per wait: 29.50 RW-shared, 5.15 RW-excl, 1.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 156397
Purge done for trx's n:o < 156397 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284371633197632, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633193464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633189296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633185128, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633180960, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633176792, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284371633172624, 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: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
1330 OS file reads, 10071 OS file writes, 4787 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 10.91 writes/s, 4.55 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 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
12.39 hash searches/s, 32.79 non-hash searches/s
---
LOG
---
Log sequence number 84293141
Log flushed up to   84292709
Pages flushed up to 84290320
Last checkpoint at  84267801
0 pending log flushes, 0 pending chkp writes
3359 log i/o's done, 3.21 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 167772160
Dictionary memory allocated 355568
Buffer pool size   8027
Free buffers       6695
Database pages     1322
Old database pages 505
Modified db pages  19
Percent of dirty pages(LRU & free pages): 0.237
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 1185, created 137, written 6134
0.00 reads/s, 0.06 creates/s, 7.15 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: 1322, unzip_LRU len: 0
I/O sum[0]:cur[47], 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=4736, Main thread ID=7232, state: sleeping
Number of rows inserted 14, updated 2084, deleted 0, read 10973597
0.00 inserts/s, 2.39 updates/s, 0.00 deletes/s, 24.64 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 9728
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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