Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-05-31 15:46:50 0x1610 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 55 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 2710 srv_active, 0 srv_shutdown, 191606 srv_idle
srv_master_thread log flush and writes: 194316
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 13074
OS WAIT ARRAY INFO: signal count 14095
RW-shared spins 45124, rounds 531011, OS waits 9539
RW-excl spins 8018, rounds 70941, OS waits 1788
RW-sx spins 79, rounds 1520, OS waits 41
Spin rounds per wait: 11.77 RW-shared, 8.85 RW-excl, 19.24 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 666763
Purge done for trx's n:o < 666763 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283608288941112, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288936944, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288911936, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288899432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288895264, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288928608, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288924440, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288907768, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288903600, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288932776, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288891096, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288886928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288995296, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288920272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283608288916104, 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
1903382 OS file reads, 77227 OS file writes, 34730 OS fsyncs
18.76 reads/s, 16384 avg bytes/read, 18.27 writes/s, 7.60 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 294, seg size 296, 15501 merges
merged operations:
 insert 23588, delete mark 4217, delete 2546
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)
53.87 hash searches/s, 102.34 non-hash searches/s
---
LOG
---
Log sequence number 6342122730
Log flushed up to   6342122730
Pages flushed up to 6342122730
Last checkpoint at  6342122687
0 pending log flushes, 0 pending chkp writes
18131 log i/o's done, 4.76 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 2852056
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 458892, not young 104241614
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1902239, created 645, written 54465
18.76 reads/s, 0.22 creates/s, 12.42 writes/s
Buffer pool hit rate 960 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 1.75/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 258, unzip_LRU len: 0
I/O sum[1454]:cur[0], 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=6308, Main thread ID=8420, state: sleeping
Number of rows inserted 11034, updated 4735, deleted 542, read 313794434
0.24 inserts/s, 3.55 updates/s, 0.00 deletes/s, 104.69 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 88016
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 249.70 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================