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Storage engines

InnoDB Documentation

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

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2026-10-05 21:06:44 0x4f8 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 46 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 3239 srv_active, 0 srv_shutdown, 7324 srv_idle
srv_master_thread log flush and writes: 10563
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 21032
OS WAIT ARRAY INFO: signal count 11736
RW-shared spins 1607, rounds 46719, OS waits 1533
RW-excl spins 966, rounds 4011, OS waits 52
RW-sx spins 7, rounds 101, OS waits 2
Spin rounds per wait: 29.07 RW-shared, 4.15 RW-excl, 14.43 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 42289
Purge done for trx's n:o < 42289 undo n:o < 0 state: running
History list length 9
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283479386046680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283479386042512, 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
29287 OS file reads, 44671 OS file writes, 22531 OS fsyncs
1.57 reads/s, 16384 avg bytes/read, 6.30 writes/s, 2.63 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 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)
8.17 hash searches/s, 17.74 non-hash searches/s
---
LOG
---
Log sequence number 25107920
Log flushed up to   25107899
Pages flushed up to 25105934
Last checkpoint at  25098209
0 pending log flushes, 0 pending chkp writes
12194 log i/o's done, 1.76 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 170272
Buffer pool size   1003
Free buffers       737
Database pages     258
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.502
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 29216, created 430, written 28684
1.57 reads/s, 0.04 creates/s, 4.20 writes/s
Buffer pool hit rate 976 / 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[263]:cur[2], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=6928, Main thread ID=9168, state: sleeping
Number of rows inserted 333, updated 5657, deleted 323, read 431684
0.00 inserts/s, 1.33 updates/s, 0.00 deletes/s, 7.33 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 21087
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 2.98 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================