Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-06-06 17:01:02 0x265c INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 29 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6243447 srv_active, 0 srv_shutdown, 1886597 srv_idle
srv_master_thread log flush and writes: 8101585
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 8829082
OS WAIT ARRAY INFO: signal count 3839997
RW-shared spins 3814075, rounds 36512125, OS waits 1058764
RW-excl spins 2252014, rounds 7283168, OS waits 56418
RW-sx spins 115536, rounds 1122706, OS waits 18085
Spin rounds per wait: 9.57 RW-shared, 3.23 RW-excl, 9.72 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 26898136
Purge done for trx's n:o < 26898136 undo n:o < 0 state: running
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283400122905944, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283400122901776, 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 283400122835088, 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 283400122839256, 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 283400122893440, 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 283400122864264, 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 283400122897608, 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 283400122876768, 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 283400122860096, 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
1582766 OS file reads, 53754052 OS file writes, 28167507 OS fsyncs
9.14 reads/s, 16384 avg bytes/read, 16.65 writes/s, 7.55 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 11, seg size 13, 2956 merges
merged operations:
 insert 78914, 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)
24.41 hash searches/s, 66.93 non-hash searches/s
---
LOG
---
Log sequence number 167492287190
Log flushed up to   167492287170
Pages flushed up to 167492238702
Last checkpoint at  167492238570
0 pending log flushes, 0 pending chkp writes
9062669 log i/o's done, 5.10 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 185296
Buffer pool size   1003
Free buffers       736
Database pages     259
Old database pages 0
Modified db pages  76
Percent of dirty pages(LRU & free pages): 7.631
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 1582685, created 443918, written 36566629
9.14 reads/s, 0.10 creates/s, 10.48 writes/s
Buffer pool hit rate 963 / 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: 259, unzip_LRU len: 0
I/O sum[720]:cur[12], 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 7059, updated 39843939, deleted 9401, read 2993799312
0.00 inserts/s, 4.24 updates/s, 0.00 deletes/s, 45.07 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 178311
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.03 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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