Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-07-17 12:35:31 0x7a2c0d9b46c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 42 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 2549 srv_active, 0 srv_shutdown, 7492 srv_idle
srv_master_thread log flush and writes: 10040
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 1565
OS WAIT ARRAY INFO: signal count 945
RW-shared spins 600, rounds 17652, OS waits 582
RW-excl spins 30, rounds 751, OS waits 22
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 29.42 RW-shared, 25.03 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 27291
Purge done for trx's n:o < 27291 undo n:o < 0 state: running
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 415804358214136, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415804358209920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415804358201488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 415804358205704, 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: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
4532 OS file reads, 32858 OS file writes, 17762 OS fsyncs
0.79 reads/s, 16384 avg bytes/read, 6.62 writes/s, 2.60 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 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 0 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 1 buffer(s)
7.00 hash searches/s, 19.43 non-hash searches/s
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LOG
---
Log sequence number 12145801
Log flushed up to   12145781
Pages flushed up to 12143273
Last checkpoint at  12126924
0 pending log flushes, 0 pending chkp writes
8927 log i/o's done, 1.79 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1003
Free buffers       744
Database pages     257
Old database pages 0
Modified db pages  5
Percent of dirty pages(LRU & free pages): 0.499
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 4498, created 294, written 20552
0.79 reads/s, 0.02 creates/s, 4.55 writes/s
Buffer pool hit rate 988 / 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: 257, unzip_LRU len: 0
I/O sum[259]:cur[1], 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=1749, Main thread ID=134328700880576, state: sleeping
Number of rows inserted 6, updated 5116, deleted 0, read 148746
0.00 inserts/s, 1.19 updates/s, 0.00 deletes/s, 4.95 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 4184
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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