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I’m having trouble understanding the intent of the start and count arguments to SUBSTR in the SCRUB_EMAIL function.
I understand that we...
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Hello @andatki,
On Chapter 8, page 145, in the Generating Data for Experiments section, one of the paragraphs stars with the following: ...
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Title: High Performance PostgreSQL for Rails: Archiving mentions deleted_at column (p338)
The sql command DELETE FROM trip_positions WH...
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@andatki
The correct migration code for ruby/migration_snippet_virtual_column.rb is
class AlterTempCustomers < ActiveRecord::Migrati...
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Hello @andatki ,
I ran into a problem with the migration suggested p. 75:
class AddCheckConstraintTripsCompletedAt < ActiveRecord::M...
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Dear Andrew, @andatki
I found the explanation regarding the use of .includes() with a limit in the context of vehicle reservations to b...
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Please use the following format for the title of this thread (then simply delete/replace this text with the content for the thread):
Tit...
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@andatki
I have encountered a couple of issues in the sections explaining the cloning of tables without constraints, copying all rows, a...
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I found it challenging to use code examples from this book, particularly because the queries containing non-printing Unicode characters. ...
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Active Record supports multiple validations becoming listed out for an
attribute.
It took me a couple of tries to understand this, may...
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I’m having trouble understanding the intent of the start and count arguments to SUBSTR in the SCRUB_EMAIL function.
I understand that we...
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Build fast, scalable PostgreSQL and Rails apps. Solve data growth, quality, and reliability challenges, for workloads from consumer Inter...
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@andatki
“If you’ve used the history command in your terminal, psql supports a similar “reverse search” by typing “ctrl-r”. Type ctrl-r,...
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Title: High Performance PostgreSQL for Rails
@aapsql @andatki
A reader wrote this by email. Re-posting here:
Do you run clusters on y...
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High Performance PostgreSQL for Rails: How to show autovacuum_vacuum_scale_factor per table (p. 171)
@andatki
On page 171, it shows how to change the autovacuum scale factor for a particular table, eg:
ALTER TABLE trips SET (autovacuum_...
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Hi @andatki! First of all, thank you so much for this amazing book! :muscle:
I’ve found something that can cause a bit of confusion.
Af...
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@andatki
class AddTripRatingCheckConstraint < ActiveRecord::Migration[7.0]
def change
add_check_constraint :users, "rating...
New
@andatki
bin/rails db:reset doesn’t work if there is no socket file locally which is the case if I’m running Postgres from a Docker cont...
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@andatki
Minor typo - extra U:
“To free up the space, you’ll need to VACUUUM FULL users;…”
Fix:
To free up the space, you’ll need to ...
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I found it challenging to use code examples from this book, particularly because the queries containing non-printing Unicode characters. ...
New
Hi,
I’m reading chapter 3 (B8.0), in particular the part about cloning sequences and indexes to the scrubbed tables. This part confused ...
New
Active Record supports multiple validations becoming listed out for an
attribute.
It took me a couple of tries to understand this, may...
New
@andatki
I have encountered a couple of issues in the sections explaining the cloning of tables without constraints, copying all rows, a...
New
Dear Andrew, @andatki
I found the explanation regarding the use of .includes() with a limit in the context of vehicle reservations to b...
New
Please use the following format for the title of this thread (then simply delete/replace this text with the content for the thread):
Tit...
New
Title: High Performance PostgreSQL for Rails: Archiving mentions deleted_at column (p338)
The sql command DELETE FROM trip_positions WH...
New
Most Active Last Three Years
Roshan asked:
Is this useful for non Rails users?
As the author, I’m biased, but I think so. While all of the application code exampl...
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@andatki
Hi, page 26 says
Data cannot be split across pages.
But two paragraphs later
Data may not fit in a single page, may be spl...
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@andatki
In the book, you make a reference to acts_as_paranoid, but given the simplicity and popularity: Category: Active Record Soft De...
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Hi and thank you for this fantastic book,
I ran in the following error while trying to run db/scripts/bulk_load.sh:
Bulk loading 10_000...
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@andatki
High Performance PostgreSQL for Rails - wrong code example
The code description does not match the code snippet.
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@andatki
In this page, you mention:
The Transaction Pooling Mode for PgBouncer cannot be used with Advisory Locks
Can you expand a tit...
New
Hello @andatki ,
I ran into a problem with the migration suggested p. 75:
class AddCheckConstraintTripsCompletedAt < ActiveRecord::M...
New
@andatki
The correct migration code for ruby/migration_snippet_virtual_column.rb is
class AlterTempCustomers < ActiveRecord::Migrati...
New
Hello @andatki,
On Chapter 8, page 145, in the Generating Data for Experiments section, one of the paragraphs stars with the following: ...
New
Most Active Over Three Years
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