Geeks for Geeks PSuch like Negtive weight cycle detection problem.Exists a polynomial algorithm to solve this problem.is set of problems that can be solved by a deterministic Turing machine in Polyn

Assume we have 2 transactions execute concurrently. possible problemdirty readTransaction 1 reads uncommitted data from transaction 2. Uncommitted means these data could be removed or changed someho

Mail user agentuser program that used for sending and receiving email. Like foxmail… webmail also count on. Mail transfer agenttransfer email from one server to another Mail delivery agentreceive mail

logical backupLogical backup extract metadata(with SQL) from postgresql.Its advantages includes human readable text and better transplantability. pg_dumpDump objects or single database into file.

When you open psql, the information it provide to you is just for notification of command completion. If you need more idea about how parse tree, execution plan and internal debug log are, you need to

xminTransaction ID for insertion. For identifying different transactions.Will changes after new transaction(Whether Insert/Update) commits. xmaxTransaction ID for deletion. Not being 0 means t

For official documentation, please refer to Postgresql. Table levelOnce acquired, a lock is normally held till end of transaction.But if a lock is acquired after establishing a savepoint, the lock i

I spent a long time searching for a good framework or API to do my oral programming work, yesterday I finally find a good way to do that.First you need to use google speech api, and even before using

the middleware in ring provides another way to understand function that return function.Here I am gonno explain a little bit.The code below comes from stackoverflow. 12345678910111213141516171819(let

Well, since the first time I got in touch with pointer in C, this guy has confused me a little bit. About three years ago I made a experiment to clarify its properties, but in another blog.I am gonna