Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-06-06 16:56:13 0x21b0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 25 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 6243359 srv_active, 0 srv_shutdown, 1886399 srv_idle
srv_master_thread log flush and writes: 8101299
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 8828474
OS WAIT ARRAY INFO: signal count 3839787
RW-shared spins 3814011, rounds 36510151, OS waits 1058699
RW-excl spins 2252000, rounds 7282834, OS waits 56408
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 26897342
Purge done for trx's n:o < 26897342 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283400122914280, 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 283400122910112, 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 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)
---TRANSACTION 283400122847592, 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
1581872 OS file reads, 53752112 OS file writes, 28166640 OS fsyncs
2.72 reads/s, 16384 avg bytes/read, 5.32 writes/s, 3.04 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)
12.04 hash searches/s, 29.80 non-hash searches/s
---
LOG
---
Log sequence number 167491771836
Log flushed up to   167491771816
Pages flushed up to 167491767587
Last checkpoint at  167491764975
0 pending log flushes, 0 pending chkp writes
9062107 log i/o's done, 1.76 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 185296
Buffer pool size   1003
Free buffers       719
Database pages     276
Old database pages 0
Modified db pages  23
Percent of dirty pages(LRU & free pages): 2.309
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 1581791, created 443901, written 36565372
2.72 reads/s, 0.00 creates/s, 3.08 writes/s
Buffer pool hit rate 972 / 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: 276, unzip_LRU len: 0
I/O sum[149]: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=8208, Main thread ID=4436, state: sleeping
Number of rows inserted 7059, updated 39843542, deleted 9401, read 2993791414
0.00 inserts/s, 0.96 updates/s, 0.00 deletes/s, 39.36 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 177671
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================