Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-05-14 16:15:30 0x2ee8 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 95 srv_active, 0 srv_shutdown, 22147 srv_idle
srv_master_thread log flush and writes: 22242
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 401
OS WAIT ARRAY INFO: signal count 240
RW-shared spins 323, rounds 7180, OS waits 222
RW-excl spins 275, rounds 546, OS waits 1
RW-sx spins 35, rounds 434, OS waits 3
Spin rounds per wait: 22.23 RW-shared, 1.99 RW-excl, 12.40 RW-sx
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TRANSACTIONS
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Trx id counter 79953
Purge done for trx's n:o < 79953 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283386049253808, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283386049249640, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283386049245472, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283386049241304, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283386049237136, 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
2244 OS file reads, 5789 OS file writes, 2546 OS fsyncs
1.54 reads/s, 16384 avg bytes/read, 5.08 writes/s, 2.49 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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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 0 buffer(s)
Hash table size 4441, node heap has 0 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 1 buffer(s)
7.43 hash searches/s, 16.05 non-hash searches/s
---
LOG
---
Log sequence number 30612798
Log flushed up to   30612798
Pages flushed up to 30612798
Last checkpoint at  30612789
0 pending log flushes, 0 pending chkp writes
2141 log i/o's done, 1.65 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 112680
Buffer pool size   1003
Free buffers       742
Database pages     256
Old database pages 0
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2195, created 204, written 3487
1.54 reads/s, 0.03 creates/s, 3.11 writes/s
Buffer pool hit rate 975 / 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: 256, unzip_LRU len: 0
I/O sum[192]:cur[0], 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=9756, Main thread ID=7920, state: sleeping
Number of rows inserted 1489, updated 222, deleted 3, read 94334
0.00 inserts/s, 0.89 updates/s, 0.00 deletes/s, 7.03 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 801
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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