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How to print the values of slices
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PostgreSQL ERROR: canceling statement due to conflict with recovery
...
No need to touch hot_standby_feedback. As others have mentioned, setting it to on can bloat master. Imagine opening transaction on a slave and not closing it.
Instead, set max_standby_archive_delay and max_standby_streaming_delay to some sane value:
# /etc/postgresql/10/main/postgresql.c...
Stream vs Views vs Iterators
...sk for the next element.
Scala used to provide iterators which could be reset, but that is very hard to support in a general manner, and they didn't make version 2.8.0.
Views are meant to be viewed much like a database view. It is a series of transformation which one applies to a collection to pro...
ssh remote host identification has changed
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Here is the simplest solution
ssh-keygen -R <host>
For example,
ssh-keygen -R 192.168.3.10
From ssh-keygen man page:
-R hostname Removes all keys belonging to hostname from a known_hosts file. This option is useful to delete hashed hosts (see the -H option above).
...
Force update of an Android app when a new version is available
I have an app in Google Play Store. When an update version is available, the older version will become unusable – that is, if users do not update the app, they do not enter in the app. How can I force users to update the app when a new version becomes available?
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XML Schema: Element with attributes containing only text?
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How to get city name from latitude and longitude coordinates in Google Maps?
...c void getAddress(Context context, double LATITUDE, double LONGITUDE) {
//Set Address
try {
Geocoder geocoder = new Geocoder(context, Locale.getDefault());
List<Address> addresses = geocoder.getFromLocation(LATITUDE, LONGITUDE, 1);
if (addresses != null && addresses.size()...
Are static variables shared between threads?
... an upper level Java class on threading said something that I wasn't sure of.
7 Answers
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In Ruby on Rails, what's the difference between DateTime, Timestamp, Time and Date?
...changes in records.
TIMESTAMP also affected by different TIME ZONE related setting.
DATETIME is constant.
TIMESTAMP internally converted a current time zone to UTC for storage,
and during retrieval convert the back to the current time zone.
DATETIME can not do this.
TIMESTAMP is 4 bytes and DATETIME...
Can we make unsigned byte in Java
...o the `b & 0xFF` is equivalent with `((int) b) & 0xFF`.
* b) were set to 1s because of "sign extension" during the upcasting
*
* 1111 1111 1111 1111 1111 1111 1100 1000 (the int)
* &
* 0000 0000 0000 0000 0000 0000 1111 1111 (the 0xFF)
* =======================================
* 0...