Storage engines

InnoDB

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

[ Variables | Buffer Pool | InnoDB Status ]

=====================================
2026-09-08 19:53:09 0x2cf0 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 48 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1539 srv_active, 0 srv_shutdown, 194376 srv_idle
srv_master_thread log flush and writes: 195915
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3195
OS WAIT ARRAY INFO: signal count 775
RW-shared spins 286, rounds 4745, OS waits 103
RW-excl spins 533, rounds 3095, OS waits 22
RW-sx spins 0, rounds 0, OS waits 0
Spin rounds per wait: 16.59 RW-shared, 5.81 RW-excl, 0.00 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 9521
Purge done for trx's n:o < 9498 undo n:o < 0 state: running but idle
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 283340025115488, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025111320, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025107152, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025102984, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025098816, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025094648, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025090480, ACTIVE 0 sec returning various info to MariaDB
mysql tables in use 16, locked 0
0 lock struct(s), heap size 1128, 0 row lock(s)
MySQL thread id 942, OS thread handle 8924, query id 105239 localhost ::1 root Sending data
SELECT c.*,
        YEAR(CURDATE()) AS membership_year,
        CASE
        WHEN (
        LOWER(TRIM(COALESCE(c.role, ''))) LIKE '%emeritus%'
        OR EXISTS (
        SELECT 1
        FROM memberships annual_membership
        WHERE annual_membership.year = YEAR(CURDATE())
          AND LOWER(TRIM(annual_membership.status)) = 'activa'
          AND (
              (
                  COALESCE(annual_membership.payment_plan_enabled, 0) = 1
                  AND COALESCE(annual_membership.payment_plan_balance, annual_membership.payment_plan_total, annual_membership.final_amount) <= 0
      
Trx read view will not see trx with id >= 9521, sees < 9521
---TRANSACTION 283340025086312, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025082144, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025077976, not started
0 lock struct(s), heap size 1128, 0 row lock(s)
---TRANSACTION 283340025073808, 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
38808 OS file reads, 874 OS file writes, 354 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, 2 merges
merged operations:
 insert 2, 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 1 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 1 buffer(s)
Hash table size 4441, node heap has 1 buffer(s)
Hash table size 4441, node heap has 2 buffer(s)
58.42 hash searches/s, 330.53 non-hash searches/s
---
LOG
---
Log sequence number 124632024
Log flushed up to   124632024
Pages flushed up to 124632024
Last checkpoint at  124632015
0 pending log flushes, 0 pending chkp writes
219 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 33554432
Dictionary memory allocated 150240
Buffer pool size   1003
Free buffers       740
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 79, not young 122713
0.00 youngs/s, 0.00 non-youngs/s
Pages read 38748, created 174, written 613
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: 256, 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
1 read views open inside InnoDB
Process ID=14096, Main thread ID=18444, state: sleeping
Number of rows inserted 12, updated 3246, deleted 0, read 101218044
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 6284.68 reads/s
Number of system rows inserted 0, updated 0, deleted 0, read 1940
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================