Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-25 19:09:52 0x7f8c941046c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 42 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 26351 srv_active, 0 srv_shutdown, 4924164 srv_idle
srv_master_thread log flush and writes: 4949877
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 51466
OS WAIT ARRAY INFO: signal count 40560
RW-shared spins 7421, rounds 222696, OS waits 7394
RW-excl spins 37, rounds 1200, OS waits 37
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.01 RW-shared, 32.43 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 142833
Purge done for trx's n:o < 142833 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421716743218016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421716743209584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421716743192720, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421716743213800, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421716743205368, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421716743201152, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421716743196936, 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
44174 OS file reads, 357063 OS file writes, 188284 OS fsyncs
1.62 reads/s, 16384 avg bytes/read, 6.79 writes/s, 3.36 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 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)
6.24 hash searches/s, 23.24 non-hash searches/s
---
LOG
---
Log sequence number 59105196
Log flushed up to   59105176
Pages flushed up to 59098143
Last checkpoint at  59088633
0 pending log flushes, 0 pending chkp writes
95439 log i/o's done, 2.21 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1003
Free buffers       744
Database pages     256
Old database pages 0
Modified db pages  26
Percent of dirty pages(LRU & free pages): 2.597
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 44140, created 1813, written 228749
1.62 reads/s, 0.00 creates/s, 4.05 writes/s
Buffer pool hit rate 979 / 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[233]: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=284, Main thread ID=140241369253568, state: sleeping
Number of rows inserted 56, updated 54020, deleted 0, read 1046142
0.00 inserts/s, 1.62 updates/s, 0.00 deletes/s, 6.05 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 43275
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.48 reads/s
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END OF INNODB MONITOR OUTPUT
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