Storage engines

InnoDB

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

[ Variable | Bufferpool | InnoDB status ]

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2026-02-05 11:21:31 0x7f3f0c103700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 11 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 1129 srv_active, 0 srv_shutdown, 1842 srv_idle
srv_master_thread log flush and writes: 2971
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 4549
OS WAIT ARRAY INFO: signal count 3153
RW-shared spins 0, rounds 2025, OS waits 1010
RW-excl spins 0, rounds 420, OS waits 14
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 2025.00 RW-shared, 420.00 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 40999
Purge done for trx's n:o < 40999 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421383756788216, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421383756783960, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421383756779704, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
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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
799 OS file reads, 13661 OS file writes, 7769 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 6.73 writes/s, 1.82 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
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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 9 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 3 buffer(s)
Hash table size 69257, node heap has 25 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
2.18 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 11447367
Log flushed up to   11447367
Pages flushed up to 11447367
Last checkpoint at  11440623
0 pending log flushes, 0 pending chkp writes
4904 log i/o's done, 1.27 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 130928
Buffer pool size   16024
Free buffers       15186
Database pages     775
Old database pages 306
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 640, created 135, written 7799
0.00 reads/s, 0.00 creates/s, 5.27 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: 775, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
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ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=907, Main thread ID=139908014401280, state: sleeping
Number of rows inserted 1, updated 1744, deleted 0, read 110245
0.00 inserts/s, 0.55 updates/s, 0.00 deletes/s, 1.09 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 302
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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