Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-20 14:47:46 0x2cc8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 50 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 239 srv_active, 0 srv_shutdown, 54414 srv_idle
srv_master_thread log flush and writes: 54653
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9004
OS WAIT ARRAY INFO: signal count 306
RW-shared spins 193, rounds 5624, OS waits 152
RW-excl spins 10, rounds 255, OS waits 4
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.14 RW-shared, 25.50 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 199050
Purge done for trx's n:o < 199050 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283999273926872, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273922704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273951880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273947712, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273939376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283999273935208, 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
4598 OS file reads, 4419 OS file writes, 1957 OS fsyncs
7.92 reads/s, 16384 avg bytes/read, 6.40 writes/s, 2.38 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 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)
5.96 hash searches/s, 15.92 non-hash searches/s
---
LOG
---
Log sequence number 140208339
Log flushed up to   140208319
Pages flushed up to 140204422
Last checkpoint at  140173007
0 pending log flushes, 0 pending chkp writes
1207 log i/o's done, 1.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 333032
Buffer pool size   1003
Free buffers       741
Database pages     259
Old database pages 0
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.699
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 327, not young 5251
0.00 youngs/s, 0.00 non-youngs/s
Pages read 4462, created 165, written 2945
7.92 reads/s, 0.04 creates/s, 4.60 writes/s
Buffer pool hit rate 875 / 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[626]: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=4932, Main thread ID=7240, state: sleeping
Number of rows inserted 0, updated 670, deleted 0, read 121768
0.00 inserts/s, 1.14 updates/s, 0.00 deletes/s, 28.22 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1851
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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