Showing some logons information.
-bash-3.2$ mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 59
Server version: 5.0.95 Source distribution
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select user, host, password from mysql.user order by user, host;
+------+---------------+------------------+
| user | host | password |
+------+---------------+------------------+
| | localhost | |
| | mysql | |
| root | xx.xxx.xxx.xxx| 5d88439630a903db |
| root | 127.0.0.1 | |
| root | localhost | 5d88439630a903db |
| root | mysql | |
+------+---------------+------------------+
6 rows in set (0.03 sec)
Showing interesting instance information.
mysql> status
--------------
mysql Ver 14.12 Distrib 5.0.95, for redhat-linux-gnu (x86_64) using readline 5.1
Connection id: 59
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.0.95 Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: latin1
Conn. characterset: latin1
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 103 days 7 hours 23 min 26 sec
Threads: 1 Questions: 385 Slow queries: 0 Opens: 25 Flush tables: 1 Open tables: 13 Queries per second avg: 0.000
--------------
Show the detail of engine INNODB .. this will reveal a lot of other instance related stuffs as well.
mysql> SHOW ENGINE INNODB STATUS
-> ;
+------------+
|
=====================================
141119 15:16:07 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 16 seconds
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3, signal count 3
Mutex spin waits 0, rounds 20, OS waits 1
RW-shared spins 4, OS waits 2; RW-excl spins 1, OS waits 0
------------
TRANSACTIONS
------------
Trx id counter 0 1280
Purge done for trx's n:o < 0 0 undo n:o < 0 0
History list length 0
Total number of lock structs in row lock hash table 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0 0, not started, process no 3919, OS thread id 1165130048
MySQL thread id 59, query id 385 localhost root
SHOW ENGINE INNODB STATUS
--------
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 (write thread)
Pending normal aio reads: 0, aio writes: 0,
ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
25 OS file reads, 3 OS file writes, 3 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 inserts, 0 merged recs, 0 merges
Hash table size 17393, used cells 0, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 0 43655
Log flushed up to 0 43655
Last checkpoint at 0 43655
0 pending log writes, 0 pending chkp writes
8 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 20618000; in additional pool allocated 676096
Buffer pool size 512
Free buffers 493
Database pages 19
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages read 19, created 0, written 0
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Main thread process no. 3919, id 1164331328, state: waiting for server activity
Number of rows inserted 0, updated 0, deleted 0, read 0
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
|
+------+
1 row in set (0.05 sec)
Showing tables that have once been accessed. A way to track db locks on table level.
mysql> show open tables;
+----------+---------------------------+--------+-------------+
| Database | Table | In_use | Name_locked |
+----------+---------------------------+--------+-------------+
| mysql | user | 0 | 0 |
| mysql | columns_priv | 0 | 0 |
| mysql | time_zone | 0 | 0 |
| vdb | vpx_version | 0 | 0 |
| mysql | time_zone_transition | 0 | 0 |
| mysql | db | 0 | 0 |
| mysql | time_zone_transition_type | 0 | 0 |
| mysql | tables_priv | 0 | 0 |
| mysql | procs_priv | 0 | 0 |
| mysql | time_zone_name | 0 | 0 |
| test | vpx_version | 0 | 0 |
| mysql | host | 0 | 0 |
+----------+---------------------------+--------+-------------+
12 rows in set (0.00 sec)
mysql>
Another way to look at table locks.
mysql> show full processlist;
+----+------+-----------+------+---------+------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+-----------+------+---------+------+-------+-----------------------+
| 60 | root | localhost | NULL | Query | 0 | NULL | show full processlist |
+----+------+-----------+------+---------+------+-------+-----------------------+
1 row in set (0.00 sec)
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