Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-04-21 17:31:07 0x4228 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 38 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 8743 srv_active, 0 srv_shutdown, 67931 srv_idle
srv_master_thread log flush and writes: 76660
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 3280411
OS WAIT ARRAY INFO: signal count 3689505
RW-shared spins 7777377, rounds 122133050, OS waits 3268350
RW-excl spins 664408, rounds 729001, OS waits 434
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 15.70 RW-shared, 1.10 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 100357
Purge done for trx's n:o < 100357 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282970780201536, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780197368, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780193200, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780189032, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780184864, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780180696, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282970780176528, 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
61010025 OS file reads, 126640 OS file writes, 76688 OS fsyncs
834.50 reads/s, 16384 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 629 merges
merged operations:
 insert 629, delete mark 3, 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 6 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 19 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
16065.79 hash searches/s, 5503.43 non-hash searches/s
---
LOG
---
Log sequence number 81795673
Log flushed up to   81795673
Pages flushed up to 81795673
Last checkpoint at  81795664
0 pending log flushes, 0 pending chkp writes
38370 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 97656
Buffer pool size   1003
Free buffers       1
Database pages     972
Old database pages 339
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 9520705, not young 2359123852
480.54 youngs/s, 2509.09 non-youngs/s
Pages read 61009980, created 833, written 73677
834.50 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 987 / 1000, young-making rate 7 / 1000 not 37 / 1000
Pages read ahead 222.26/s, evicted without access 34.18/s, Random read ahead 0.00/s
LRU len: 972, unzip_LRU len: 0
I/O sum[33052]: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=4240, Main thread ID=5824, state: sleeping
Number of rows inserted 2729, updated 11014, deleted 3, read 1557158791
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 33224.89 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 13968
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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