Concurrency erro when deleteing or updating multiple key field
You can use the default hash function, or easily compare performance and choose from among several other built-in hash functions. It’s been incorporated into commercial software, academic research, and into other open-source software.
It has also been added to the native package repositories for a number of Unix-y distros.
If a connection is currently open in the calling thread, then the extension will be loaded for that connection as well as all subsequent connections.
There’s always a chance of update conflicts, like when two concurring transactions try to update the same record.
Choosing the isolation level is about finding the right balance of consistency and scalability for our current application requirements.
All the following examples are going to be run on Postgre SQL 9.3.
When inserting multiple rows, if an error occurs for some of these rows there is no error returned but instead the number of rows affected would be decreased by the number of rows that failed to be inserted.
When inserting into tables containing It is possible to insert data using a query instead of values.
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Since you’re reading this, chances are that you know a hash is used for looking up items using a key. It inlines automatically because it’s implemented as macros.