Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-21 15:40:28 0x7aedf825c6c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 13 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 19543 srv_active, 0 srv_shutdown, 20057 srv_idle
srv_master_thread log flush and writes: 39593
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1539636
OS WAIT ARRAY INFO: signal count 259731
RW-shared spins 21486, rounds 629674, OS waits 13630
RW-excl spins 200, rounds 6450, OS waits 208
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.31 RW-shared, 32.25 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 8223059
Purge done for trx's n:o < 8223059 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 416637696840784, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696836568, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696832352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696828136, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696823920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696819704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696811272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696815488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 416637696807056, 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
723515 OS file reads, 187426 OS file writes, 119044 OS fsyncs
1.92 reads/s, 16384 avg bytes/read, 8.00 writes/s, 5.31 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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Ibuf: size 1, free list len 368, seg size 370, 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 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)
22.23 hash searches/s, 25.84 non-hash searches/s
---
LOG
---
Log sequence number 3912688320
Log flushed up to   3912688300
Pages flushed up to 3912685929
Last checkpoint at  3912684727
0 pending log flushes, 0 pending chkp writes
62959 log i/o's done, 2.46 log i/o's/second
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BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 400160
Buffer pool size   1003
Free buffers       729
Database pages     258
Old database pages 0
Modified db pages  11
Percent of dirty pages(LRU & free pages): 1.113
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2268, not young 21803272
0.00 youngs/s, 0.00 non-youngs/s
Pages read 723345, created 1355, written 103561
1.92 reads/s, 0.00 creates/s, 4.54 writes/s
Buffer pool hit rate 999 / 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: 258, unzip_LRU len: 0
I/O sum[300]:cur[5], 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=1089, Main thread ID=135161446381248, state: sleeping
Number of rows inserted 0, updated 23062, deleted 0, read 1480758809
0.00 inserts/s, 1.15 updates/s, 0.00 deletes/s, 55225.67 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 3378
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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