Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-26 13:11:14 0x7f8cf97ff640 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 19 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 601244 srv_active, 0 srv_shutdown, 1569010 srv_idle
srv_master_thread log flush and writes: 2170158
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3624028
OS WAIT ARRAY INFO: signal count 2128640
RW-shared spins 668784, rounds 20057731, OS waits 653746
RW-excl spins 2678, rounds 78841, OS waits 2471
RW-sx spins 14, rounds 366, OS waits 11
Spin rounds per wait: 29.99 RW-shared, 29.44 RW-excl, 26.14 RW-sx
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TRANSACTIONS
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Trx id counter 3437524
Purge done for trx's n:o < 3437524 undo n:o < 0 state: running but idle
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421718385009024, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421718385004808, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421718385000592, 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
1382452 OS file reads, 6852455 OS file writes, 4574179 OS fsyncs
0.21 reads/s, 16384 avg bytes/read, 1.79 writes/s, 1.47 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 1 buffer(s)
Hash table size 4441, node heap has 2 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)
4.74 hash searches/s, 3.95 non-hash searches/s
---
LOG
---
Log sequence number 1143269939
Log flushed up to   1143269939
Pages flushed up to 1143269939
Last checkpoint at  1143269930
0 pending log flushes, 0 pending chkp writes
2667541 log i/o's done, 0.84 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 178120
Buffer pool size   1002
Free buffers       737
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 1382371, created 28625, written 3504721
0.21 reads/s, 0.05 creates/s, 0.74 writes/s
Buffer pool hit rate 989 / 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[37]: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=4164158, Main thread ID=140242937955904, state: sleeping
Number of rows inserted 88, updated 736221, deleted 0, read 48495489
0.00 inserts/s, 0.21 updates/s, 0.00 deletes/s, 30.10 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1007570
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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