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Storage engines

InnoDB Documentation

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

[ Variables | Buffer Pool | InnoDB Status ]


=====================================
2022-10-02 23:57:23 0x7f8e78441700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 47 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 314 srv_active, 0 srv_shutdown, 14587 srv_idle
srv_master_thread log flush and writes: 14898
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 2054
OS WAIT ARRAY INFO: signal count 1375
RW-shared spins 0, rounds 1215, OS waits 613
RW-excl spins 0, rounds 364, OS waits 16
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 1215.00 RW-shared, 364.00 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 38708
Purge done for trx's n:o < 38708 undo n:o < 0 state: running
History list length 19
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421724856947192, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421724856942936, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
---TRANSACTION 421724856938680, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
--------
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
732 OS file reads, 4142 OS file writes, 2827 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 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 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 1 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
Hash table size 69257, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 9553893
Log flushed up to   9553041
Pages flushed up to 9553041
Last checkpoint at  9553032
0 pending log flushes, 0 pending chkp writes
1849 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 285212672
Dictionary memory allocated 88176
Buffer pool size   16024
Free buffers       15306
Database pages     716
Old database pages 281
Modified db pages  38
Percent of dirty pages(LRU & free pages): 0.237
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 573, created 143, written 1969
0.00 reads/s, 0.00 creates/s, 0.00 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: 716, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=915, Main thread ID=140249111971584, state: sleeping
Number of rows inserted 1, updated 315, deleted 0, read 884
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1539
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================