Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-26 16:22:49 0x2188 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 43 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 1535 srv_active, 0 srv_shutdown, 541696 srv_idle
srv_master_thread log flush and writes: 543231
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 31331
--Thread 7984 has waited at srv0srv.cc line 900 for 0.00 seconds the semaphore:
Mutex at 00007FF614F90C50, Mutex SRV_SYS created srv0srv.cc:1005, lock var 2

OS WAIT ARRAY INFO: signal count 10644
RW-shared spins 840, rounds 25083, OS waits 422
RW-excl spins 36, rounds 1133, OS waits 18
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.86 RW-shared, 31.47 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 45461
Purge done for trx's n:o < 45461 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283473638916456, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283473638912288, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283473638908120, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283473638903952, 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: native aio handle (insert buffer thread)
I/O thread 1 state: native aio handle (log thread)
I/O thread 2 state: native aio handle (read thread)
I/O thread 3 state: native aio handle (read thread)
I/O thread 4 state: native aio handle (read thread)
I/O thread 5 state: native aio handle (read thread)
I/O thread 6 state: native aio handle (write thread)
I/O thread 7 state: native aio handle (write thread)
I/O thread 8 state: native aio handle (write thread)
I/O thread 9 state: native aio handle (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
6366 OS file reads, 20845 OS file writes, 10104 OS fsyncs
2.05 reads/s, 16384 avg bytes/read, 7.21 writes/s, 0.74 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.72 hash searches/s, 5.05 non-hash searches/s
---
LOG
---
Log sequence number 29844559
Log flushed up to   29844559
Pages flushed up to 29844559
Last checkpoint at  29839484
0 pending log flushes, 0 pending chkp writes
5457 log i/o's done, 0.35 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       831
Database pages     170
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 6330, created 285, written 13664
2.05 reads/s, 0.02 creates/s, 6.65 writes/s
Buffer pool hit rate 931 / 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: 170, unzip_LRU len: 0
I/O sum[363]: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=8128, Main thread ID=4204, state: sleeping
Number of rows inserted 0, updated 3437, deleted 0, read 30962
0.00 inserts/s, 0.19 updates/s, 0.00 deletes/s, 1.88 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2071
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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