Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-24 17:45:16 0x2a38 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 56 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 30569 srv_active, 0 srv_shutdown, 1598 srv_idle
srv_master_thread log flush and writes: 32167
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 96745
OS WAIT ARRAY INFO: signal count 30131
RW-shared spins 8716, rounds 215242, OS waits 6439
RW-excl spins 586, rounds 7688, OS waits 214
RW-sx spins 4, rounds 60, OS waits 0
Spin rounds per wait: 24.70 RW-shared, 13.12 RW-excl, 15.00 RW-sx
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TRANSACTIONS
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Trx id counter 2549917
Purge done for trx's n:o < 2549917 undo n:o < 0 state: running but idle
History list length 6
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283816560218968, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283816560210552, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283816560202136, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283816560197928, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283816560214760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283816560206344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283816560193720, 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
196515 OS file reads, 485658 OS file writes, 235566 OS fsyncs
10.21 reads/s, 16384 avg bytes/read, 26.77 writes/s, 10.54 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 170, seg size 172, 959 merges
merged operations:
 insert 2302, delete mark 418, delete 250
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 0 buffer(s)
11.11 hash searches/s, 15.54 non-hash searches/s
---
LOG
---
Log sequence number 2589546175
Log flushed up to   2589546155
Pages flushed up to 2589542424
Last checkpoint at  2589409057
0 pending log flushes, 0 pending chkp writes
123271 log i/o's done, 7.27 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 164208
Buffer pool size   1003
Free buffers       737
Database pages     259
Old database pages 0
Modified db pages  7
Percent of dirty pages(LRU & free pages): 0.702
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 666, not young 5947733
0.00 youngs/s, 0.00 non-youngs/s
Pages read 196400, created 4555, written 315245
10.21 reads/s, 0.36 creates/s, 17.93 writes/s
Buffer pool hit rate 948 / 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[1262]:cur[106], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=4048, Main thread ID=6544, state: sleeping
Number of rows inserted 100, updated 79606, deleted 0, read 8718141
0.00 inserts/s, 5.96 updates/s, 0.00 deletes/s, 111.07 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 215894
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1.93 reads/s
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END OF INNODB MONITOR OUTPUT
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