mysql server issue in linux server

Dear Experts

We have sugarcrm running on redhat linux it was successfully working but suddenly we started getting data base failure we got to know this is due to space utilisation was 100% used, later we provisioned additional space but this required us to reboot the server, server is  vm on esxi server.

1.We are not able to start and stop mysql service by service mysql  start/stop and also not able to perform /etc/init.d/mysld start/stop, mysqld scripts found to be missing in /etc/init.d/.  Hence at present mysql is running by executing /usr/libexec/mysqld -u root,

2. I suspect few tables are using engine as Myisam and few tables are using the engine as innoDB and I am not sure if this is okay and this is how it will work OR if this is not okay do not know why this happened please suggest how to troubleshoot and fix, if you suggest all the tables to be using one type of engine for example  innoDB   since we have combination now that is Myisam and InnoDB how to correct this and resolve , please suggest.

additional information
please find the below yum list mysql-* output taken just now.

Please help us in trouble shooting this and permanent fix
Thanks in advance
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Dan CraciunIT ConsultantCommented:
Have you tried this:
service mysqld start

Also, recent Redhat distros don't use sysvinit any more, but systemd.

D_wathiAuthor Commented:
Thanks for the reply, until 2 days back all these was working perfectly. able to start and stop mysql services in both the ways that is from 1.service mysqld start /stop
2./etc/init.d/mysqld start/stop
now not not able to do so , actually now mysqld script file is missing in /etc/init.d.
please suggest on how to troubleshoot this and fix. is it suggested to install mysql packages if yes please let me know which packages to be installed and should will have to overwrite the existing packages , which package and what command to install/upgrade the package ,

thanks in advance
Dan CraciunIT ConsultantCommented:
If the installation was damaged, running
sudo yum reinstall mysql-server
should fix it.

Make sure you make a backup for the databases (using mysqldump) before modifying the server.

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D_wathiAuthor Commented:
Hi Dan Craciun

reinstalled mysql server but then try to start , service does not start below error message, please suggest to troubleshoot and fix it
service mysqld start
MySQL Daemon failed to start.
Starting mysqld:                                           [FAILED]
Dan CraciunIT ConsultantCommented:
Check /var/log/messages, /var/log/mysql.log for the full error message.
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