Storage engines

InnoDB

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-24 10:35:32 0x7f818008b700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 42 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 39 srv_active, 0 srv_shutdown, 245 srv_idle
srv_master_thread log flush and writes: 0
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 347
OS WAIT ARRAY INFO: signal count 336
RW-shared spins 61, rounds 115, OS waits 54
RW-excl spins 163, rounds 1094, OS waits 16
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 1.89 RW-shared, 6.71 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 10213
Purge done for trx's n:o < 10213 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421669710737720, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421669710736848, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421669710735976, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421669710735104, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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FILE I/O
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I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
1348 OS file reads, 2713 OS file writes, 852 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.98 writes/s, 0.71 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 34679, node heap has 1 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 6 buffer(s)
1972.26 hash searches/s, 1431.70 non-hash searches/s
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LOG
---
Log sequence number          52099599
Log buffer assigned up to    52099599
Log buffer completed up to   52099599
Log written up to            52099599
Log flushed up to            52099599
Added dirty pages up to      52099599
Pages flushed up to          52099599
Last checkpoint at           52099599
1264 log i/o's done, 0.41 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 137363456
Dictionary memory allocated 498046
Buffer pool size   8192
Free buffers       6779
Database pages     1390
Old database pages 493
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 712, not young 1702
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1221, created 259, written 1260
0.00 reads/s, 0.00 creates/s, 0.00 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: 1390, unzip_LRU len: 0
I/O sum[16]: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=366, Main thread ID=140194222110464 , state=sleeping
Number of rows inserted 16519, updated 1786, deleted 1529, read 872037
0.12 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2248.92 reads/s
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END OF INNODB MONITOR OUTPUT
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