Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-10 19:08:38 0x75912cbff6c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 17 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 7399 srv_active, 0 srv_shutdown, 81826 srv_idle
srv_master_thread log flush and writes: 89225
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 4592
OS WAIT ARRAY INFO: signal count 4382
RW-shared spins 3074, rounds 78339, OS waits 2546
RW-excl spins 1669, rounds 18737, OS waits 496
RW-sx spins 20, rounds 453, OS waits 9
Spin rounds per wait: 25.48 RW-shared, 11.23 RW-excl, 22.65 RW-sx
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TRANSACTIONS
------------
Trx id counter 32977
Purge done for trx's n:o < 32977 undo n:o < 0 state: running
History list length 3
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 410741392025136, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741392020920, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741392016704, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741392012488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741392008272, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741392004056, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391999840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391995624, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391991408, not started flushing log
mysql tables in use 1, locked 1
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391987192, not started flushing log
mysql tables in use 1, locked 1
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391982976, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391978760, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 410741391974544, 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: 1; buffer pool: 0
12956 OS file reads, 82622 OS file writes, 45998 OS fsyncs
0.18 reads/s, 16384 avg bytes/read, 0.18 writes/s, 0.18 fsyncs/s
-------------------------------------
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 4441, node heap has 1 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 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
3.00 hash searches/s, 2.94 non-hash searches/s
---
LOG
---
Log sequence number 15232912
Log flushed up to   15230404
Pages flushed up to 15227530
Last checkpoint at  15227521
1 pending log flushes, 0 pending chkp writes
23498 log i/o's done, 0.18 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 95160
Buffer pool size   1003
Free buffers       738
Database pages     259
Old database pages 0
Modified db pages  21
Percent of dirty pages(LRU & free pages): 2.104
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 12922, created 745, written 51262
0.18 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 991 / 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: 259, unzip_LRU len: 0
I/O sum[190]:cur[3], 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=754582, Main thread ID=129266140309184, state: sleeping
Number of rows inserted 512, updated 11241, deleted 157, read 221751
0.00 inserts/s, 0.24 updates/s, 0.00 deletes/s, 3.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8980
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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