Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-24 03:23:04 0x7eff0c0a36c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 55 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 10777 srv_active, 0 srv_shutdown, 286276 srv_idle
srv_master_thread log flush and writes: 297003
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 30601
OS WAIT ARRAY INFO: signal count 23205
RW-shared spins 2147, rounds 64380, OS waits 2141
RW-excl spins 41, rounds 1327, OS waits 39
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.99 RW-shared, 32.37 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 87117
Purge done for trx's n:o < 87117 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421109196199112, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196194896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196190680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196186464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196182248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196178032, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196173816, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196169600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196165384, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421109196161168, 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
26957 OS file reads, 188058 OS file writes, 93909 OS fsyncs
0.25 reads/s, 16384 avg bytes/read, 2.00 writes/s, 1.22 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
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 0 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 0 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
2.47 hash searches/s, 7.07 non-hash searches/s
---
LOG
---
Log sequence number 38113542
Log flushed up to   38112400
Pages flushed up to 38109619
Last checkpoint at  38109610
1 pending log flushes, 0 pending chkp writes
49223 log i/o's done, 0.76 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1002
Free buffers       740
Database pages     259
Old database pages 0
Modified db pages  27
Percent of dirty pages(LRU & free pages): 2.700
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 26924, created 1179, written 121768
0.27 reads/s, 0.00 creates/s, 1.09 writes/s
Buffer pool hit rate 988 / 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: 259, unzip_LRU len: 0
I/O sum[72]:cur[3], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=286, Main thread ID=139633892763328, state: sleeping
Number of rows inserted 56, updated 32997, deleted 0, read 585591
0.00 inserts/s, 0.36 updates/s, 0.00 deletes/s, 1.98 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 25582
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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