mysqladmin command and mysqlshow command usage and examples

mysqladmin command

1)Change MySQL root password 

mysqladmin -u root -ptmppassword password 'newpassword'

2) Check MySQL server is up or not 

mysqladmin -u root -p ping

3) Find MySQL server version 

mysqladmin -u root -ptmppassword version

4) Show the current MySQL servers status

mysqladmin -u root -ptmppassword status

5) Find the values of status variables

mysqladmin -u root -ptmppassword extended-status

6) Find the values of MySQL system variables 

mysqladmin  -u root -ptmppassword variables

7) Show all the running process/queries in MySQL databases 

mysqladmin -u root -ptmppassword processlist

8) Create MySQL database 
mysqladmin -u root -ptmppassword create testdb

9) Delete database 

mysqladmin -u root -ptmppassword drop testdb

10) Shutdown the MySQL server 

mysqladmin -u root -ptmppassword shutdown

11) Kill MySQL client process

mysqladmin -u root -ptmppassword kill 20

(20 is the process id with the process list) 

mysqlshow command

1) Show all the databases 

mysqlshow  -u root -ptmppassword

2) Show the tables on a database 

mysqlshow -v -v -u root -ptmppassword mydb_name

Comments

How to tweak linux server harddisk using hdparm

hdparm switches explained http://manpages.ubuntu.com/manpages/intrepid/man8/hdparm.8.html First of all you have to install hdparm in linux. apt-get install hdparm #hdparm /dev/sda /dev/sda: readonly = 0 (off) readahead = 120 (on) geometry = 8850/255/63, sectors = 142182912, start = 0 Hard disk Performance Information # hdparm -tT /dev/hda /dev/hdd: Timing cached reads: 496 MB in 2.00 seconds = 247.42 MB/sec Timing buffered disk reads: 60 MB in 3.03 seconds = 19.81 MB/sec Hard drive set to low, slow settings # hdparm -cuda /dev/hda /dev/hda: IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) readahead = 256 (on) Use below tweaks to increase disk read write performance. For sda drive ~]# hdparm -a 2048 /dev/sda /dev/sda: setting fs readahead to 2048 readahead = 2048 (on) For sdb drive [root@439298a ~]# hdparm -a 2048 /dev/sdb /dev/sdb: setting fs readahead to 2048 readahead = 2048 (on) ]# echo “anticipatory” >...

RAID

Check the Raid installed lspci | grep RAID Software Raid ============== Linux Support For Software RAID Currently, Linux supports the following RAID levels (quoting from the man page): LINEAR RAID0 (striping) RAID1 (mirroring) RAID4 RAID5 RAID6 RAID10 MULTIPATH, and FAULTY. MULTIPATH is not a Software RAID mechanism, but does involve multiple devices: each device is a path to one common physical storage device. FAULTY is also not true RAID, and it only involves one device. It provides a layer over a true device that can be used to inject faults. Install mdadm Type the following command under RHEL / CentOS / Fedora Linux: # yum install mdadm Type the following command under Debian / Ubuntu Linux: # apt-get update && apt-get install mdadm How Do I Create RAID1 Using mdadm? Type the following command to create RAID1 using /dev/sdc1 and /dev/sdd1 (20GB size each). First run fdisk on /dev/sdc and /dev/sdd with " Softwa...

SystemD commands

[root@centos7 ~]# systemctl -t target UNIT LOAD ACTIVE SUB DESCRIPTION basic.target loaded active active Basic System cryptsetup.target loaded active active Encrypted Volumes getty.target loaded active active Login Prompts graphical.target loaded active active Graphical Interface local-fs-pre.target loaded active active Local File Systems (Pre) local-fs.target loaded active active Local File Systems multi-user.target loaded active active Multi-User System network-online.target loaded active active Network is Online network.target loaded active active Network nfs-client.target loaded active active NFS client services nss-user-lookup.target loaded active active User and Gr...

linuxavid

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