Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-21 17:34:29 0x2a28 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 44 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 351 srv_active, 0 srv_shutdown, 20016 srv_idle
srv_master_thread log flush and writes: 20367
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 14024
OS WAIT ARRAY INFO: signal count 735
RW-shared spins 205, rounds 5488, OS waits 118
RW-excl spins 14, rounds 161, OS waits 3
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 26.77 RW-shared, 11.50 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 1513
Purge done for trx's n:o < 1512 undo n:o < 0 state: running
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282742120845816, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282742120841648, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282742120824976, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282742120837480, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282742120833312, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282742120829144, 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
1285 OS file reads, 4537 OS file writes, 2307 OS fsyncs
0.05 reads/s, 16384 avg bytes/read, 0.45 writes/s, 0.41 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.68 hash searches/s, 9.39 non-hash searches/s
---
LOG
---
Log sequence number 1131568
Log flushed up to   1131568
Pages flushed up to 1131568
Last checkpoint at  1131559
0 pending log flushes, 0 pending chkp writes
1328 log i/o's done, 0.27 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 82632
Buffer pool size   1003
Free buffers       745
Database pages     256
Old database pages 0
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 1249, created 203, written 2849
0.05 reads/s, 0.00 creates/s, 0.14 writes/s
Buffer pool hit rate 998 / 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[8]: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=9260, Main thread ID=10036, state: sleeping
Number of rows inserted 8, updated 626, deleted 0, read 5507
0.00 inserts/s, 0.05 updates/s, 0.00 deletes/s, 5.66 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 293
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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