Within a transaction, a document is inserted. Before the transaction is completed, will an outside query see this inserted document? >Solution : db.foo.drop(); db.createCollection("foo"); session = db.getMongo().startSession(); session.startTransaction( { readConcern: { level: "snapshot" }, writeConcern: { w: "majority" } } ); fxx = session.getDatabase("testX").foo; var n = 5; for(var k = 0; k < n;… Read More Inserting a document in a transaction in MongoDB?

Postgres docs state PostgreSQL actually treats every SQL statement as being executed within a transaction. If you do not issue a BEGIN command, then each individual statement has an implicit BEGIN and (if successful) COMMIT wrapped around it. A group of statements surrounded by BEGIN and COMMIT is sometimes called a transaction block. SELECT statement… Read More Does Postgres log implicit transactions?

I have implemented a class where i need to insert some data into a database but the insert must rollback if something goes wrong. Once i have performed the insert i throw an exception to test the rollback, but once i check the database, the rows are inserted, which means rollback never happened. import org.springframework.transaction.annotation.Transactional;… Read More Spring Boot JDBC @Transactional won't rollback