Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-13 19:06:33 0x1140 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 62 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6809 srv_active, 0 srv_shutdown, 2132598 srv_idle
srv_master_thread log flush and writes: 2139407
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 247494
--Thread 3636 has waited at row0row.cc line 1216 for 0.00 seconds the semaphore:
X-lock on RW-latch at 00000228BB2F1E98 created in file buf0buf.cc line 1567
a writer (thread id 0) has reserved it in mode  SX
number of readers 0, waiters flag 1, lock_word: 10000000
Last time write locked in file buf0flu.cc line 1169
OS WAIT ARRAY INFO: signal count 55280
RW-shared spins 2789, rounds 82168, OS waits 2662
RW-excl spins 97, rounds 3187, OS waits 90
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.46 RW-shared, 32.86 RW-excl, 0.00 RW-sx
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TRANSACTIONS
------------
Trx id counter 20994
Purge done for trx's n:o < 20994 undo n:o < 0 state: running
History list length 13
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283848934736160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848934731992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848934744496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848934740328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283848934727824, 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
15564 OS file reads, 76720 OS file writes, 44257 OS fsyncs
0.23 reads/s, 16384 avg bytes/read, 0.95 writes/s, 0.55 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 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
1.39 hash searches/s, 4.23 non-hash searches/s
---
LOG
---
Log sequence number 11409257
Log flushed up to   11409237
Pages flushed up to 11409237
Last checkpoint at  11406014
0 pending log flushes, 0 pending chkp writes
22778 log i/o's done, 0.31 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       744
Database pages     256
Old database pages 0
Modified db pages  1
Percent of dirty pages(LRU & free pages): 0.100
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 15529, created 417, written 46316
0.23 reads/s, 0.02 creates/s, 0.56 writes/s
Buffer pool hit rate 976 / 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[21]:cur[8], 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=1908, Main thread ID=3624, state: sleeping
Number of rows inserted 56, updated 10218, deleted 0, read 219388
0.00 inserts/s, 0.21 updates/s, 0.00 deletes/s, 1.55 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 22622
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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