Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-08-05 22:35:47 0xe08 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 46 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 7892840 srv_active, 0 srv_shutdown, 5377961 srv_idle
srv_master_thread log flush and writes: 13242342
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 9331312
OS WAIT ARRAY INFO: signal count 4415796
RW-shared spins 4547707, rounds 48342826, OS waits 1423102
RW-excl spins 2485725, rounds 8038166, OS waits 61212
RW-sx spins 116434, rounds 1145236, OS waits 18773
Spin rounds per wait: 10.63 RW-shared, 3.23 RW-excl, 9.84 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 28854291
Purge done for trx's n:o < 28854291 undo n:o < 0 state: running
History list length 7
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283400122901776, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122876768, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122905944, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122889272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122868432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122872600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122893440, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122864264, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122885104, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122855928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122847592, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122897608, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122843424, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122851760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122839256, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122860096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122880936, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122835088, 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: complete io for buf page (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: 1
2438611 OS file reads, 65127519 OS file writes, 34265914 OS fsyncs
5.65 reads/s, 16384 avg bytes/read, 9.20 writes/s, 4.41 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 11, seg size 13, 3011 merges
merged operations:
 insert 78969, delete mark 77314, delete 64921
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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
13.74 hash searches/s, 35.37 non-hash searches/s
---
LOG
---
Log sequence number 177568952332
Log flushed up to   177568952332
Pages flushed up to 177568952332
Last checkpoint at  177568939058
0 pending log flushes, 0 pending chkp writes
11678943 log i/o's done, 3.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 185296
Buffer pool size   1003
Free buffers       737
Database pages     258
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 2438530, created 611082, written 43907204
5.65 reads/s, 0.07 creates/s, 5.50 writes/s
Buffer pool hit rate 959 / 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: 258, unzip_LRU len: 0
I/O sum[492]:cur[21], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=8208, Main thread ID=4436, state: sleeping
Number of rows inserted 8242, updated 44783912, deleted 10543, read 3591325271
0.00 inserts/s, 2.46 updates/s, 0.00 deletes/s, 34.30 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 276687
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.02 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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