Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-09-29 00:55:03 0x2b60 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 128 srv_active, 0 srv_shutdown, 395917 srv_idle
srv_master_thread log flush and writes: 396045
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 167
OS WAIT ARRAY INFO: signal count 139
RW-shared spins 93, rounds 2634, OS waits 85
RW-excl spins 21, rounds 140, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 28.32 RW-shared, 6.67 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 131238
Purge done for trx's n:o < 131238 undo n:o < 0 state: running but idle
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283632237777760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237773592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237769424, not started
mysql tables in use 1, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237765256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237761088, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237756920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237752752, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237748584, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237744416, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237740248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283632237736080, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
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
2249 OS file reads, 2641 OS file writes, 1185 OS fsyncs
11.84 reads/s, 16384 avg bytes/read, 6.00 writes/s, 2.76 fsyncs/s
-------------------------------------
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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
8.57 hash searches/s, 20.73 non-hash searches/s
---
LOG
---
Log sequence number 14175595441
Log flushed up to   14175595441
Pages flushed up to 14175595441
Last checkpoint at  14175595432
0 pending log flushes, 0 pending chkp writes
768 log i/o's done, 1.95 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 110176
Buffer pool size   1003
Free buffers       745
Database pages     256
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 2201, created 154, written 1708
11.84 reads/s, 0.08 creates/s, 3.70 writes/s
Buffer pool hit rate 901 / 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[658]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=3788, Main thread ID=5232, state: sleeping
Number of rows inserted 0, updated 501, deleted 0, read 79668
0.00 inserts/s, 1.43 updates/s, 0.00 deletes/s, 272.83 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 2052
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 15.38 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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