Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-22 13:34:31 0x7bc9906b86c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 9614 srv_active, 0 srv_shutdown, 22502 srv_idle
srv_master_thread log flush and writes: 32114
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 262703
OS WAIT ARRAY INFO: signal count 34431
RW-shared spins 2472, rounds 74132, OS waits 2465
RW-excl spins 532, rounds 16041, OS waits 525
RW-sx spins 3, rounds 90, OS waits 3
Spin rounds per wait: 29.99 RW-shared, 30.15 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 54212
Purge done for trx's n:o < 54212 undo n:o < 0 state: running
History list length 12
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 417580559573256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 417580559594336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 417580559590120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 417580559585904, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 417580559581688, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 417580559577472, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 417580559569040, 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
16664 OS file reads, 96581 OS file writes, 56554 OS fsyncs
0.62 reads/s, 16384 avg bytes/read, 2.62 writes/s, 0.97 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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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 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 1 buffer(s)
2.43 hash searches/s, 9.00 non-hash searches/s
---
LOG
---
Log sequence number 17657579
Log flushed up to   17657559
Pages flushed up to 17655389
Last checkpoint at  17652064
0 pending log flushes, 0 pending chkp writes
27394 log i/o's done, 0.73 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 170800
Buffer pool size   1003
Free buffers       742
Database pages     258
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.500
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 16591, created 514, written 59103
0.62 reads/s, 0.00 creates/s, 1.81 writes/s
Buffer pool hit rate 975 / 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: 258, unzip_LRU len: 0
I/O sum[82]:cur[8], 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=920137, Main thread ID=136104854398656, state: sleeping
Number of rows inserted 71, updated 12638, deleted 0, read 353286
0.00 inserts/s, 0.54 updates/s, 0.00 deletes/s, 2.49 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 18142
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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