How do I check if my DB is up?
How to check if DB is up & running from Application Server?
- Write a shell script in App server which connects to DB. Trigger a dummy select statement. If that works then DB is up.
- Write a shell script in App server which pings the DB. If ping works then DB is up.
How do I know if mysql is running on Linux?
We check the status with the systemctl status mysql command. We use the mysqladmin tool to check if MySQL server is running. The -u option specifies the user which pings the server. The -p option is a password for the user.
How do I know if Pmon is running?
On Windows systems, go to Control Panel→Administrative Tools→Services to see whether the Oracle service has started. You can also look under Windows Task Manager to find similar information. On Linux/UNIX systems, simply check for the PMON process. Without PMON, there’s no Oracle database instance running.
How do you restart a database?
To start, stop, pause, resume, or restart an instance of the SQL Server Database Engine. In Object Explorer, connect to the instance of the Database Engine, right-click the instance of the Database Engine you want to start, and then click Start, Stop, Pause, Resume, or Restart.
How do I start the database in Linux?
On Linux with Gnome: In the Applications menu, point to Oracle Database 11g Express Edition, and then select Start Database. On Linux with KDE: Click the icon for the K Menu, point to Oracle Database 11g Express Edition, and then select Start Database.
Where is MySQL database file in Linux?
Resolution
- Open up MySQL’s configuration file: less /etc/my.cnf.
- Search for the term “datadir”: /datadir.
- If it exists, it will highlight a line that reads: datadir = [path]
- You can also manually look for that line. …
- If that line does not exist, then MySQL will default to: /var/lib/mysql.
How do I know if MariaDB is running on Linux?
How to check MariaDB version
- Log into your MariaDB instance, in our case we log in using the command: mysql -u root -p.
- After you log in you can see your version in the welcome text – highlighted in the screen-grab below:
- If you cannot see your version here you can also run the following command to see it:
How do I list databases in Linux?
To get a list of the databases without logging in to the MySQL shell you can use either the mysql command with the -e option which stands for execute or the mysqlshow that displays databases and tables information.
How do I check my TNS Listener status?
Do the following:
- Log on to the host where the Oracle database resides.
- Change to the following directory: Solaris: Oracle_HOME/bin. Windows: Oracle_HOMEbin.
- To start the listener service, type the following command: Solaris: lsnrctl START. Windows: LSNRCTL. …
- Repeat step 3 to verify that the TNS listener is running.
What is Pmon in Linux?
Process Monitor (PMON) cleans up abnormally terminated user processes. This includes rolling back a process’s transaction and releasing its resources such as transaction locks and memory. PMON also detects and resolves deadlocks by rolling back the deadlocking transaction.
How do you mount a database?
To mount the database, the instance finds the database control files and opens them. Control files are specified in the CONTROL_FILES initialization parameter in the parameter file used to start the instance. Oracle then reads the control files to get the names of the database’s datafiles and redo log files.