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Storage engines

InnoDB Documentation

Supports transactions, row-level locking, and foreign keys

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2025-07-29 03:31:58 0xc5eec INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 25 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 173 srv_active, 0 srv_shutdown, 1686581 srv_idle
srv_master_thread log flush and writes: 0
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 337
OS WAIT ARRAY INFO: signal count 327
RW-shared spins 0, rounds 0, OS waits 0
RW-excl spins 0, rounds 0, OS waits 0
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 0.00 RW-shared, 0.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 152309
Purge done for trx's n:o < 152309 undo n:o < 0 state: running but idle
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 284433613001984, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284433613001208, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 284433613000432, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: wait Windows aio (insert buffer thread)
I/O thread 1 state: wait Windows aio (read thread)
I/O thread 2 state: wait Windows aio (read thread)
I/O thread 3 state: wait Windows aio (read thread)
I/O thread 4 state: wait Windows aio (read thread)
I/O thread 5 state: wait Windows aio (write thread)
I/O thread 6 state: wait Windows aio (write thread)
I/O thread 7 state: wait Windows aio (write thread)
I/O thread 8 state: wait Windows aio (write thread)
Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] ,
 ibuf aio reads:
Pending flushes (fsync) log: 0; buffer pool: 0
1203 OS file reads, 5747 OS file writes, 2028 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.12 writes/s, 0.04 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 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
Hash table size 34679, node heap has 0 buffer(s)
0.00 hash searches/s, 289.59 non-hash searches/s
---
LOG
---
Log sequence number          155075279
Log buffer assigned up to    155075279
Log buffer completed up to   155075279
Log written up to            155075279
Log flushed up to            155075279
Added dirty pages up to      155075279
Pages flushed up to          155075279
Last checkpoint at           155075279
Log minimum file id is       47
Log maximum file id is       47
1210 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 0
Dictionary memory allocated 594867
Buffer pool size   8191
Free buffers       6773
Database pages     1418
Old database pages 504
Modified db pages  0
Pending reads      0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2168, not young 266
0.16 youngs/s, 0.00 non-youngs/s
Pages read 1180, created 1289, written 3489
0.00 reads/s, 0.12 creates/s, 0.04 writes/s
Buffer pool hit rate 1000 / 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: 1418, unzip_LRU len: 0
I/O sum[1]:cur[1], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=9680, Main thread ID=12712 , state=sleeping
Number of rows inserted 99252, updated 0, deleted 0, read 99610
1.92 inserts/s, 0.00 updates/s, 0.00 deletes/s, 1.92 reads/s
Number of system rows inserted 8, updated 958, deleted 8, read 3543773
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 203.95 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================