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Someone please suggest the command to cleanup mongodb collection events older than 12 hrs.
I need to configure this as part of cronjob, and will be executing at every 12.00 PM and 12.00 AM.
First, you need to store creation date and time in your documents. Create an additional field, if you do not have it. Having this field i collection, you have two options:
Either running a job with cron, that will remove all documents older than 12 hr. Smthing like db.collection.remove({"createdAt" : {$gt : Date.now() - 43200000}})
Create an TTL index for this field, that will automatically do all the cool things. db.collection.ensureIndex( { "createdAt": 1 }, { "expireAfterSeconds": 43200 } )
I would prefer the second solution.
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I have this code, and it is supposed to write to Firestore. However, when it does the function, in the back end, it shows highlighted as red and then disappears.
db.collection("jokes").document("Dad Jokes").setData(["\(dadJokeNum + 1)": Joke.text!])
Please help.
Using SetData without Merge will delete existing values - it is suggested that if the document exists prior, you should always be using merge: true. Firestore also has a limited 1 write per second each, you should be managing writes together as it is most likely similar writes will conflict and potentially resolve out of order.
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For a MS Word document, I need to find all occurrences of any month name and replace it with a generic place older. How can I do that with the Find and Replace function?
i.e., How can I search a Word document for every occurance of January February March April ... etc.
I can do this for one month at a time, but would like to do it for any month in a single action.
Your question is off-topic for StackOverflow, as it's not a programming question.
Nevertheless, you can use a wildcard Find/Replace where:
Find = <[JFMASOND][abceghilmnoprstuvy]{2,8}>
Replace = [MONTH]
Note: The above will find abbreviated months also. There is also a small risk of mis-matches if you have capitalized words in the document that the expression can match. For example, 'May' may or may not be a month, whilst 'Feminine' is never a month. If you pair the Find with a day and/or year, you'll eliminate the risk of mis-matches. For example:
Find = <[JFMASOND][abceghilmnoprstuvy]{2,8}( [0-9]{1,4}>)
Replace = [MONTH]/1
will find a month name followed by a day or year number, whilst retaining that number in the replacement.
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How can I create a member in a PDS using either JCL or REXX? The member's name must contain the actual date. Is that possible?
It can be done in JCL and by Rexx. You need to remember that member names are a maximum of 8 bytes and cannot start with a numeric so you would need to use something like the 'Julian' date e.g. 2017365. You may have system variables available to populate your JCL - check the JCL manual and level of Z/os that you are using.
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I have 3 FirDataSnapshot. When I am using observeEventType(.ChildAdded,..), it returns 3 item. When I use observeSingeEventTypeOf, it returns only 1 snapshot. I don't know why.
observeSingleEventType returns single value means it observe .childAdded only once ... the block is immediately canceled after the initial data is returned.
If you are using observeEventType than it gets all values from database ..
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I'm reading an paper about EDF scheduling algorithm and I'm going to implement it after get it. I couldn't find any acceptable answer for it so I asked this question.
does anybody know this question's answer?
There is no mystery in these terms
relative deadline is a deadline relative to start of the job (start of the thread, ...),
absolute deadline is a specific point in time.
So a periodic job - for example a task that is executed every second - can have constant relative deadline - for example 100ms - but on each run its absolute deadline will be different (11:10:00.100, 11:10:01.100, 11:10:02.100, ...).
See page 335 - http://books.google.pl/books?id=iilIj3JXNrAC&printsec=frontcover&hl=pl&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false (really good source of info about operating systems)