Storage engines

InnoDB

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

[ Variable | Bufferpool | InnoDB status ]

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2025-09-19 10:12:50 0x7f03506a8700 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 20 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 8270 srv_active, 0 srv_shutdown, 28197 srv_idle
srv_master_thread log flush and writes: 36463
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 26163
OS WAIT ARRAY INFO: signal count 21253
RW-shared spins 0, rounds 21344, OS waits 10667
RW-excl spins 0, rounds 1201, OS waits 41
RW-sx spins 1, rounds 30, OS waits 1
Spin rounds per wait: 21344.00 RW-shared, 1201.00 RW-excl, 30.00 RW-sx
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TRANSACTIONS
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Trx id counter 57564
Purge done for trx's n:o < 57564 undo n:o < 0 state: running
History list length 2
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421127209018008, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421127209013752, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421127209009496, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421127209005240, 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
962 OS file reads, 95594 OS file writes, 63148 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 3.95 writes/s, 1.25 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 2 buffer(s)
Hash table size 69257, node heap has 10 buffer(s)
Hash table size 69257, node heap has 2 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 26 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
0.40 hash searches/s, 0.65 non-hash searches/s
---
LOG
---
Log sequence number 22844568
Log flushed up to   22844568
Pages flushed up to 22844568
Last checkpoint at  22844559
0 pending log flushes, 0 pending chkp writes
39737 log i/o's done, 0.70 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 128256
Buffer pool size   16024
Free buffers       15006
Database pages     949
Old database pages 370
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 803, created 146, written 48071
0.00 reads/s, 0.00 creates/s, 3.05 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: 949, 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=905, Main thread ID=139651457214208, state: sleeping
Number of rows inserted 2, updated 10032, deleted 0, read 3657345
0.00 inserts/s, 0.20 updates/s, 0.00 deletes/s, 0.45 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 9233
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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