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InnoDB Documentation

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

[ Variables | Mémoire tampon | État InnoDB ]


=====================================
2025-07-02 00:17:50 0x7f9f655ca700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 29 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 113 srv_active, 0 srv_shutdown, 858 srv_idle
srv_master_thread log flush and writes: 971
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 413
OS WAIT ARRAY INFO: signal count 392
RW-shared spins 0, rounds 314, OS waits 157
RW-excl spins 0, rounds 30, OS waits 1
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 314.00 RW-shared, 30.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 37740
Purge done for trx's n:o < 37740 undo n:o < 0 state: running but idle
History list length 18
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421797575324152, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421797575319896, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421797575315640, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (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
742 OS file reads, 1461 OS file writes, 876 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 1.00 writes/s, 0.90 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 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
0.14 hash searches/s, 0.79 non-hash searches/s
---
LOG
---
Log sequence number 9381908
Log flushed up to   9381771
Pages flushed up to 9381415
Last checkpoint at  9381352
0 pending log flushes, 0 pending chkp writes
588 log i/o's done, 0.59 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 128256
Buffer pool size   16024
Free buffers       15309
Database pages     714
Old database pages 283
Modified db pages  3
Percent of dirty pages(LRU & free pages): 0.019
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 583, created 131, written 782
0.00 reads/s, 0.00 creates/s, 0.31 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: 714, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=906, Main thread ID=140322101204736, state: sleeping
Number of rows inserted 1, updated 155, deleted 0, read 46938
0.00 inserts/s, 0.14 updates/s, 0.00 deletes/s, 0.34 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 298
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================