Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-03-17 14:16:49 0xdd4 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 28 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1422 srv_active, 0 srv_shutdown, 773177 srv_idle
srv_master_thread log flush and writes: 774599
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SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 77356
OS WAIT ARRAY INFO: signal count 40441
RW-shared spins 3156, rounds 93176, OS waits 3051
RW-excl spins 466, rounds 2380, OS waits 21
RW-sx spins 12, rounds 200, OS waits 3
Spin rounds per wait: 29.52 RW-shared, 5.11 RW-excl, 16.67 RW-sx
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TRANSACTIONS
------------
Trx id counter 89214
Purge done for trx's n:o < 89210 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283517833782184, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833736336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833778016, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833773848, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833769680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833765512, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833761344, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833757176, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833753008, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833748840, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833744672, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283517833740504, 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
2667 OS file reads, 32008 OS file writes, 18275 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 4 buffer(s)
Hash table size 34679, node heap has 5 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 4 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 2 buffer(s)
Hash table size 34679, node heap has 3 buffer(s)
Hash table size 34679, node heap has 1 buffer(s)
0.21 hash searches/s, 486.91 non-hash searches/s
---
LOG
---
Log sequence number 40501106
Log flushed up to   40501106
Pages flushed up to 40501106
Last checkpoint at  40501097
0 pending log flushes, 0 pending chkp writes
12907 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 167772160
Dictionary memory allocated 994088
Buffer pool size   8027
Free buffers       5573
Database pages     2430
Old database pages 917
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 5, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 2226, created 204, written 17218
0.00 reads/s, 0.00 creates/s, 0.00 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: 2430, 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=2672, Main thread ID=5584, state: sleeping
Number of rows inserted 3571, updated 2133, deleted 116, read 46478211
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 229.96 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 904819
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
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