Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

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2026-01-30 02:01:32 0x10b34 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 42 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 910 srv_active, 0 srv_shutdown, 613622 srv_idle
srv_master_thread log flush and writes: 614532
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 28436
OS WAIT ARRAY INFO: signal count 584
RW-shared spins 846, rounds 25367, OS waits 237
RW-excl spins 21, rounds 572, OS waits 11
RW-sx spins 1, rounds 30, OS waits 0
Spin rounds per wait: 29.98 RW-shared, 27.24 RW-excl, 30.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 69245
Purge done for trx's n:o < 69244 undo n:o < 0 state: running
History list length 11
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 282690352505336, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282690352501168, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282690352497000, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 282690352484496, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 69244, ACTIVE 1 sec updating or deleting
mysql tables in use 1, locked 1
2 lock struct(s), heap size 1128, 1 row lock(s)
MySQL thread id 4226, OS thread handle 8428, query id 215982 localhost 127.0.0.1 pma Update
REPLACE INTO `phpmyadmin`.`pma__recent` (`username`, `tables`) VALUES ('root', '[{\"db\":\"mysql\",\"table\":\"user\"},{\"db\":\"performance_schema\",\"table\":\"mutex_instances\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__users\"},{\"db\":\"information_schema\",\"table\":\"ALL_PLUGINS\"},{\"db\":\"information_schema\",\"table\":\"REFERENTIAL_CONSTRAINTS\"},{\"db\":\"phpmyadmin\",\"table\":\"pma__relation\"},{\"db\":\"performance_schema\",\"table\":\"table_io_waits_summary_by_table\"},{\"db\":\"mysql\",\"table\":\"func\"},{\"db\":\"mysql\",\"table\":\"columns_priv\"},{\"db\":\"performance_schema
---TRANSACTION 282690352488664, 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
2039 OS file reads, 10025 OS file writes, 6450 OS fsyncs
1 pending reads, 0 pending writes
0.14 reads/s, 16384 avg bytes/read, 0.65 writes/s, 0.53 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 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 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)
1.21 hash searches/s, 1.83 non-hash searches/s
---
LOG
---
Log sequence number 38567641
Log flushed up to   38567641
Pages flushed up to 38567641
Last checkpoint at  38567632
0 pending log flushes, 0 pending chkp writes
3645 log i/o's done, 0.33 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 80128
Buffer pool size   1003
Free buffers       742
Database pages     259
Old database pages 0
Modified db pages  1
Percent of dirty pages(LRU & free pages): 0.100
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 2003, created 221, written 5408
0.14 reads/s, 0.02 creates/s, 0.26 writes/s
Buffer pool hit rate 973 / 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: 259, unzip_LRU len: 0
I/O sum[14]:cur[3], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=17604, Main thread ID=5640, state: sleeping
Number of rows inserted 0, updated 1044, deleted 0, read 8692
0.00 inserts/s, 0.10 updates/s, 0.00 deletes/s, 1.14 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1040
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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