see
View all indexes in the database db.system.indexes.find ()
db.system.indexes.find ()
Why is it so after I type it
see
View all indexes in the database db.system.indexes.find ()
db.system.indexes.find ()
Why is it so after I type it
this command should be entered under the shell of mongodb, not under the shell of the operating system. First execute the commands of mongo, entering various mongodb, like this
. 
db.system.indexes.find ()?
first of all, mongodb is installed normally. It is installed in D: mongodb (folder), and the database is stored in D: mongoData (database folder). When joining the system service, it is added through configuration file parameters (mongodb version 3.6) ...
as the title, my question is, for example, there is a table with five pieces of data in it, respectively * 1 * { "_id" : ObjectId("5b50807f334ca1071be530aa"), "a" : , "a" : 2 } * 2 * { "...
this is the case. Everything is normal for mongodb under Ubuntu, authentication is enabled, and all users created by users are normal and can be verified. The following information shows the three users I created. It also connects to, (nodejs normally w...
problem description I want to update the mongodb database and store an array with some deleted elements in mongodb, but when at least two threads perform this task at the same time, there is a second kind of update loss problem, such as the original a...