Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-27 06:29:47 0x30f840000 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 41 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 16074 srv_active, 0 srv_shutdown, 1168181 srv_idle
srv_master_thread log flush and writes: 1184255
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1567262
OS WAIT ARRAY INFO: signal count 1551569
RW-shared spins 1896356, rounds 35421808, OS waits 737255
RW-excl spins 1482975, rounds 18014756, OS waits 274586
RW-sx spins 5341, rounds 133133, OS waits 3194
Spin rounds per wait: 18.68 RW-shared, 12.15 RW-excl, 24.93 RW-sx
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TRANSACTIONS
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Trx id counter 431893
Purge done for trx's n:o < 431893 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 422172607103368, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 422172607099176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 422172607094984, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 422172607090792, 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
3241218 OS file reads, 1079532 OS file writes, 220891 OS fsyncs
0.22 reads/s, 16384 avg bytes/read, 0.27 writes/s, 0.27 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 402, seg size 404, 137380 merges
merged operations:
 insert 3702942, delete mark 202, delete 14
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
0.78 hash searches/s, 2.80 non-hash searches/s
---
LOG
---
Log sequence number 24814341010
Log flushed up to   24814340990
Pages flushed up to 24814334179
Last checkpoint at  24814333201
0 pending log flushes, 0 pending chkp writes
87397 log i/o's done, 0.20 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 805728
Buffer pool size   1002
Free buffers       736
Database pages     257
Old database pages 0
Modified db pages  26
Percent of dirty pages(LRU & free pages): 2.616
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 34379, not young 86076808
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3240881, created 250235, written 929503
0.22 reads/s, 0.00 creates/s, 0.05 writes/s
Buffer pool hit rate 978 / 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: 257, unzip_LRU len: 0
I/O sum[0]:cur[11], 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=62930, Main thread ID=13139656704, state: sleeping
Number of rows inserted 21101163, updated 153721, deleted 605, read 233076427
0.00 inserts/s, 0.17 updates/s, 0.00 deletes/s, 0.68 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 224180
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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