problem description There are two indexes in mongo, the first is a single-field index of the {_ id} field, and the second index is a composite index composed of {chat_id, _ id}. When I use the query db.collection.find ({ "chat_id ": ObjectId ( "* ")...
raceback (most recent call last): File " home shenjianlin .local lib python3.4 site-packages twisted internet defer.py", line 653, in _runCallbacks current.result = callback(current.result, *args, **kw) File " home shenjianlin my_pr...
in java, mongodb is operated by multiple threads. uses mongoTemplate as an operation. then, there are more than five hundred threads to operate on the mongodb. then, it was found that none of the 500-plus threads had to create a new mongodb connection...
how can I delete the files under the journal file of mongodb? produced a lot of tables before, so some were deleted, but this folder still has more than 60 gigabytes, which is much larger than the size of the existing tables. how to clean it up? ...
case: a table has at least 30 million pieces of data per day. There are thousands of types. Can you now quickly read the maximum values of the day for thousands of types at a time, that is, the last record time of the day? Maybe 15:00. Maybe 23:00. I m...
I currently have a query using mongodb3.4, that needs to be paged. Paging needs to return the total number and number of pages. but that s the problem. Paging queries are fast, but counting is slow . The count statement is as follows: db.message.fin...
how to call a class s function in a class, for example, I wrote class DailishiyanDownloaderMiddleware (object): -sharp Not all methods need to be defined. If a method is not defined, -sharp scrapy acts as if the downloader middleware does not modify ...
click=(e)=>{ let arrPanes = []; arrPanes.push(e); console.log(arrPanes); clickN1 }...
[global] pid = usr local php var run php-fpm.pid error_log = usr local php var log php-fpm.log log_level = notice [www] listen = tmp php-cgi.sock listen.backlog = -1 listen.allowed_clients = 127.0.0.1 listen.owner = www listen.group = www listen.mode ...
what are the two types of attribute names of an object? ask for guidance. Isn t the previous string a type? there can be many attributes and names in an object. ...
WeChat Mini Programs does form form submission. I call each input-bound out-of-focus event in the submit function of the form component, and verify each input data before submitting the form, but find that calling the out-of-focus event directly will re...