Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-17 16:15:05 0xf94 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 5 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1498 srv_active, 0 srv_shutdown, 780131 srv_idle
srv_master_thread log flush and writes: 781629
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 83344
OS WAIT ARRAY INFO: signal count 43069
RW-shared spins 3345, rounds 98779, OS waits 3231
RW-excl spins 481, rounds 2469, OS waits 21
RW-sx spins 12, rounds 200, OS waits 3
Spin rounds per wait: 29.53 RW-shared, 5.13 RW-excl, 16.67 RW-sx
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TRANSACTIONS
------------
Trx id counter 89555
Purge done for trx's n:o < 89553 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283517833736336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833778016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833773848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833769680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833765512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833761344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833757176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833753008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833748840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833744672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833740504, 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
2668 OS file reads, 33338 OS file writes, 19204 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.80 writes/s, 0.80 fsyncs/s
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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 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
0.00 hash searches/s, 464.51 non-hash searches/s
---
LOG
---
Log sequence number 40896762
Log flushed up to   40896762
Pages flushed up to 40896762
Last checkpoint at  40896753
0 pending log flushes, 0 pending chkp writes
13505 log i/o's done, 0.80 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 167772160
Dictionary memory allocated 994088
Buffer pool size   8027
Free buffers       5571
Database pages     2432
Old database pages 917
Modified db pages  0
Percent of dirty pages(LRU & free pages): 0.000
Max dirty pages percent: 75.000
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 5, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2227, created 205, written 17827
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 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: 2432, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=2672, Main thread ID=5584, state: sleeping
Number of rows inserted 3581, updated 2263, deleted 116, read 47549514
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 152.17 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 945695
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
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END OF INNODB MONITOR OUTPUT
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