Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2025-12-13 18:58:05 0x1730 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 11 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 27703 srv_active, 0 srv_shutdown, 109325 srv_idle
srv_master_thread log flush and writes: 137028
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 504792
OS WAIT ARRAY INFO: signal count 243716
RW-shared spins 246566, rounds 4267956, OS waits 62703
RW-excl spins 159720, rounds 611554, OS waits 3445
RW-sx spins 193, rounds 2468, OS waits 47
Spin rounds per wait: 17.31 RW-shared, 3.83 RW-excl, 12.79 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 14521525
Purge done for trx's n:o < 14521525 undo n:o < 0 state: running
History list length 17
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283879747077176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747060504, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747073008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747043832, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747056336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747052168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747022992, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747106352, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747098016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747068840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747048000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747085512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747064672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747027160, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747031328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747118856, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747102184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747081344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747035496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283879747039664, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
--------
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
23041985 OS file reads, 270881 OS file writes, 114663 OS fsyncs
110.35 reads/s, 16384 avg bytes/read, 5.45 writes/s, 2.45 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 146, seg size 148, 15768 merges
merged operations:
 insert 29611, delete mark 997, delete 409
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 1 buffer(s)
Hash table size 4441, node heap has 27 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 1 buffer(s)
5174.89 hash searches/s, 4960.91 non-hash searches/s
---
LOG
---
Log sequence number 11574449475
Log flushed up to   11574449475
Pages flushed up to 11574449475
Last checkpoint at  11574445351
0 pending log flushes, 0 pending chkp writes
71524 log i/o's done, 1.73 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 150994944
Dictionary memory allocated 8698896
Buffer pool size   1003
Free buffers       707
Database pages     262
Old database pages 0
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 452900, not young 614878746
0.00 youngs/s, 8907.28 non-youngs/s
Pages read 23038277, created 1513, written 184956
110.35 reads/s, 0.09 creates/s, 3.45 writes/s
Buffer pool hit rate 996 / 1000, young-making rate 0 / 1000 not 295 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 262, unzip_LRU len: 0
I/O sum[4035]:cur[15], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=4484, Main thread ID=6712, state: sleeping
Number of rows inserted 34552, updated 2537, deleted 16832, read 982560005
0.82 inserts/s, 0.00 updates/s, 0.73 deletes/s, 12890.56 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 0
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================