PostgreSQL exception handling

I met... Not long ago PostgreSQL An exception occurred in the database , Finished processing . By the way .

The error report is as follows ：

deadly ： Lock file “ postmaster.pid” Already exists ”

reason ： Most of them are due to the installation of several different versions of Postgresql After the database , This results in multiple... Under the root directory of the installation data Folder , So that postmaster.pid File is locked , then postgresql Related services failed to start .

Treatment measures ：

Remove redundant data file , Delete all redundant files under the root directory , Restart the system .

【 Summary 】

Record a daily account today , Not small flow into the sea ！