What’s default TTL in Redis?
There is no default TTL. By default, keys are set to live forever.
ttl
Redis store key without a value
Who said that you should actually store anything in redis key? Empty string “” is a perfectly valid value for a redis key, and it’s a shortest possible one: > SET foo “” OK > GET foo “” > BITCOUNT foo (integer) 0
Redis Multi-Set With a TTL
I was also looking for this kind of operation. I didn’t find anything, so I did it with MULTI/EXEC: MULTI expire key1 expire key2 expire key3 EXEC
TTL for a set member
No, this isn’t possible (and not planned either). The recommended approach is to use an ordered set with score set to timestamp and then manually removing expired keys. To query for non-expired keys, you can use ZRANGEBYSCORE $now +inf, to delete expired keys, ZREMRANGEBYSCORE -inf $now will do the trick. In my application, I simply … Read more
What happens when your TTL gets screwed up in your DNS record?
Ryan has provided an excellent answer to one interpretation of your question. Given our target audience however, and the situation of the people most likely to stumble upon the question, I’m going to answer a different one. What does a company do when a bad TTL makes it out into the wild? You have a … Read more
Is there a way to set an “expiry” time, after which a data entry is automatically deleted in PostgreSQL?
There is no built in expiration feature but if your goal is to automatically expire fields and have the logic contained within your database (and thus no outside dependency like a cron job) then you can always write a trigger. Below is an example of a trigger that deletes rows from a table that have … Read more
What are the benefits of a high TTL for DNS?
You’re right, the main disadvantage of using a low TTL is that you’ll end up dealing with a higher query load than with higher TTL. That said, as long as your DNS host doesn’t have any problems with handling the additional load, then go ahead. Honestly, if they had concerns about their ability to handle … Read more
CNAME and A record have different TTLs. Which one will be cached?
You can see that the CNAME and subsequent record have different TTLs by using dig.. dig docs.nwesd.org ; <<>> DiG 9.5.1-P3 <<>> docs.nwesd.org ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28244 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 4, ADDITIONAL: 4 ;; QUESTION SECTION: ;docs.nwesd.org. … Read more
Can Windows 2008 R2 DNS set TTL per record?
In DNS manager, click view–>advanced. Then open a DNS record. There will be some new fields, including TTL. Works on server 2008 and 2003.
Varnish Cache – default TTL?
This is in the default template: sub vcl_fetch { if (beresp.ttl <= 0s || beresp.http.Set-Cookie || beresp.http.Vary == “*”) { /* * Mark as “Hit-For-Pass” for the next 2 minutes */ set beresp.ttl = 120 s; return (hit_for_pass); } return (deliver); } So, 120 seconds.