Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-02-01 20:29:24 0x20cc INNODB MONITOR OUTPUT
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Per second averages calculated from the last 22 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 218974 srv_active, 0 srv_shutdown, 1680 srv_idle
srv_master_thread log flush and writes: 220654
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 54978
OS WAIT ARRAY INFO: signal count 247691
RW-shared spins 518831, rounds 2005980, OS waits 35023
RW-excl spins 370544, rounds 869297, OS waits 2213
RW-sx spins 87721, rounds 464668, OS waits 897
Spin rounds per wait: 3.87 RW-shared, 2.35 RW-excl, 5.30 RW-sx
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TRANSACTIONS
------------
Trx id counter 17209072
Purge done for trx's n:o < 17209072 undo n:o < 0 state: running but idle
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283229401404688, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401400520, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401396352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401392184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401379680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401388016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401375512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401371344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401363008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401383848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401367176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401338000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401342168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401358840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401350504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401346336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283229401354672, 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
49292 OS file reads, 1809039 OS file writes, 995219 OS fsyncs
1.14 reads/s, 16384 avg bytes/read, 7.45 writes/s, 3.82 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 11, seg size 13, 302 merges
merged operations:
 insert 8216, delete mark 7658, delete 6264
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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 4 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
14.68 hash searches/s, 3.82 non-hash searches/s
---
LOG
---
Log sequence number 176013652007
Log flushed up to   176013651987
Pages flushed up to 176013649321
Last checkpoint at  176013588789
0 pending log flushes, 0 pending chkp writes
303115 log i/o's done, 1.50 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 167768
Buffer pool size   1003
Free buffers       728
Database pages     261
Old database pages 0
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.707
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 49213, created 14743, written 1201333
1.14 reads/s, 0.27 creates/s, 4.91 writes/s
Buffer pool hit rate 994 / 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: 261, unzip_LRU len: 0
I/O sum[363]: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=11752, Main thread ID=6096, state: sleeping
Number of rows inserted 254414, updated 1432947, deleted 254351, read 64823799
0.00 inserts/s, 3.95 updates/s, 0.00 deletes/s, 147.45 reads/s
Number of system rows inserted 1, updated 0, deleted 0, read 3567
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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