Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-08-23 05:12:10 0x4380 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 37 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 240 srv_active, 0 srv_shutdown, 36466 srv_idle
srv_master_thread log flush and writes: 36706
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 4645
OS WAIT ARRAY INFO: signal count 558
RW-shared spins 369, rounds 9393, OS waits 283
RW-excl spins 632, rounds 3619, OS waits 18
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 25.46 RW-shared, 5.73 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 71120
Purge done for trx's n:o < 71120 undo n:o < 0 state: running but idle
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284141088244216, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284141088240048, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284141088235880, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284141088231712, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284141088223376, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284141088227544, 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
2815 OS file reads, 4249 OS file writes, 1837 OS fsyncs
1.92 reads/s, 16384 avg bytes/read, 4.22 writes/s, 1.95 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 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)
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)
4.65 hash searches/s, 13.62 non-hash searches/s
---
LOG
---
Log sequence number 1211519
Log flushed up to   1211499
Pages flushed up to 1204785
Last checkpoint at  1204785
0 pending log flushes, 0 pending chkp writes
1182 log i/o's done, 1.30 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 242888
Buffer pool size   1003
Free buffers       741
Database pages     256
Old database pages 0
Modified db pages  15
Percent of dirty pages(LRU & free pages): 1.503
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 2715, created 185, written 2863
1.84 reads/s, 0.08 creates/s, 2.68 writes/s
Buffer pool hit rate 954 / 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[242]:cur[7], 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=19420, Main thread ID=4960, state: sleeping
Number of rows inserted 34, updated 392, deleted 3, read 51155
0.00 inserts/s, 0.73 updates/s, 0.00 deletes/s, 5.57 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 910
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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