Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-10-05 23:12:02 0x7987bd3696c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 39 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 16439 srv_active, 0 srv_shutdown, 2021457 srv_idle
srv_master_thread log flush and writes: 2037779
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 248269
OS WAIT ARRAY INFO: signal count 131004
RW-shared spins 198653, rounds 2329533, OS waits 69044
RW-excl spins 2110, rounds 12166, OS waits 71
RW-sx spins 70, rounds 1639, OS waits 31
Spin rounds per wait: 11.73 RW-shared, 5.77 RW-excl, 23.41 RW-sx
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TRANSACTIONS
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Trx id counter 30331169
Purge done for trx's n:o < 30331169 undo n:o < 0 state: running
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 415098630754808, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415098630750592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415098630746376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415098630742160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
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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
3071907 OS file reads, 200449 OS file writes, 116905 OS fsyncs
28.28 reads/s, 16384 avg bytes/read, 11.90 writes/s, 5.87 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 105, seg size 107, 35 merges
merged operations:
 insert 165, delete mark 3, 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 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
136.82 hash searches/s, 42.02 non-hash searches/s
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LOG
---
Log sequence number 8097504789
Log flushed up to   8097504753
Pages flushed up to 8097480092
Last checkpoint at  8097477139
0 pending log flushes, 0 pending chkp writes
58866 log i/o's done, 3.64 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 958920
Buffer pool size   1003
Free buffers       722
Database pages     273
Old database pages 0
Modified db pages  34
Percent of dirty pages(LRU & free pages): 3.414
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 55813, not young 70617890
0.00 youngs/s, 0.00 non-youngs/s
Pages read 3071522, created 1843, written 120921
28.28 reads/s, 0.21 creates/s, 7.38 writes/s
Buffer pool hit rate 990 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 6.56/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 273, unzip_LRU len: 0
I/O sum[1143]: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=261279, Main thread ID=133622656915136, state: sleeping
Number of rows inserted 5404, updated 23270, deleted 906, read 366778150
0.00 inserts/s, 2.49 updates/s, 0.00 deletes/s, 4023.18 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 49046
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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