Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-06-02 21:44:20 0x7fc1581af6c0 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 38 seconds
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BACKGROUND THREAD
-----------------
srv_master_thread loops: 10147 srv_active, 0 srv_shutdown, 5549477 srv_idle
srv_master_thread log flush and writes: 5559001
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SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 19172
OS WAIT ARRAY INFO: signal count 15639
RW-shared spins 2560, rounds 76794, OS waits 2542
RW-excl spins 16, rounds 467, OS waits 10
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 RW-shared, 29.19 RW-excl, 0.00 RW-sx
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TRANSACTIONS
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Trx id counter 55170
Purge done for trx's n:o < 55170 undo n:o < 0 state: running but idle
History list length 4
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421943413064544, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413060328, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413056112, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413051896, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413047680, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413043464, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 421943413039248, 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
16951 OS file reads, 134572 OS file writes, 70736 OS fsyncs
0.34 reads/s, 16384 avg bytes/read, 2.95 writes/s, 1.26 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 0 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)
2.50 hash searches/s, 7.79 non-hash searches/s
---
LOG
---
Log sequence number 23563757
Log flushed up to   23563757
Pages flushed up to 23563757
Last checkpoint at  23563748
0 pending log flushes, 0 pending chkp writes
35613 log i/o's done, 0.76 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 75640
Buffer pool size   1003
Free buffers       745
Database pages     256
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 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 16917, created 760, written 86497
0.34 reads/s, 0.00 creates/s, 2.00 writes/s
Buffer pool hit rate 986 / 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[104]: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=287, Main thread ID=140468163696320, state: sleeping
Number of rows inserted 56, updated 20257, deleted 0, read 400976
0.00 inserts/s, 0.32 updates/s, 0.00 deletes/s, 2.34 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 20793
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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