Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2025-12-06 06:31:35 0x7f972c1196c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 9 seconds
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BACKGROUND THREAD
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srv_master_thread loops: 4793 srv_active, 0 srv_shutdown, 641462 srv_idle
srv_master_thread log flush and writes: 646196
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 63621
OS WAIT ARRAY INFO: signal count 21839
RW-shared spins 1140, rounds 32292, OS waits 1071
RW-excl spins 75, rounds 1626, OS waits 50
RW-sx spins 1, rounds 0, OS waits 0
Spin rounds per wait: 28.33 RW-shared, 21.68 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 27257
Purge done for trx's n:o < 27257 undo n:o < 0 state: running
History list length 1
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421762263982464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421762263978248, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421762263974032, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
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FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (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
8457 OS file reads, 61121 OS file writes, 33361 OS fsyncs
0.44 reads/s, 16384 avg bytes/read, 5.89 writes/s, 1.89 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 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 0 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 0 buffer(s)
Hash table size 4441, node heap has 0 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
5.11 hash searches/s, 12.33 non-hash searches/s
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LOG
---
Log sequence number 12007349
Log flushed up to   12007329
Pages flushed up to 12005800
Last checkpoint at  12000969
0 pending log flushes, 0 pending chkp writes
16691 log i/o's done, 1.22 log i/o's/second
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BUFFER POOL AND MEMORY
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Total large memory allocated 33554432
Dictionary memory allocated 80520
Buffer pool size   1003
Free buffers       744
Database pages     256
Old database pages 0
Modified db pages  17
Percent of dirty pages(LRU & free pages): 1.698
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 8423, created 461, written 38032
0.44 reads/s, 0.00 creates/s, 4.44 writes/s
Buffer pool hit rate 990 / 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: 256, unzip_LRU len: 0
I/O sum[325]:cur[11], 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=284, Main thread ID=140286021846720, state: sleeping
Number of rows inserted 57, updated 9518, deleted 0, read 182466
0.00 inserts/s, 0.56 updates/s, 0.00 deletes/s, 4.89 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 8306
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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