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Summary: in this tutorial, we will show you how to use the PostgreSQL ADD COLUMN statement to add one or more columns to an existing database table. Introduction to the PostgreSQL ADD COLUMN statement. To add a new column to an existing table, you use the ALTER TABLE ADD COLUMN statement as follows. If you cannot use COPY, it might help to use PREPARE to create a prepared INSERT statement, and then use EXECUTE as many times as required. This avoids some of the overhead of repeatedly parsing and planning INSERT. Different interfaces provide this facility in different ways; look for 'prepared statements' in the interface documentation.
- How To Populate Serial Key Field Postgres Insert Statement Example
- Serial Key Crack
- How To Populate Serial Key Field Postgres Insert Statement
What's the fastest way to add a BIGSERIAL column to a huge table (~3 Bil. rows, ~ 174Gb)?
EDIT:
- I want the column to be incremented values for existing rows (
NOT NULL). - I didn't set a fillfactor (which looks like a bad decision in retrospect).
- I don't have a problem with disk space, just want it to be as fast as possible.
1 Answer
What's wrong with:
Will be filled with unique values automatically (starting with 1).
If you want a number for every existing row, every row in the table has to be updated. Or do you not?
The table will be bloated to twice it's size if it cannot reuse dead tuples or free space on the data pages. Performance of the operation might benefit a lot from a FILLFACTOR lower than 100 or just random dead tuples spread out over the table. Else you may want to run VACUUM FULL ANALYZE afterwards to recover disk space. This won't be quick, though.
pgstattuple
You may be interested in this extension. It helps you gather statistics on your tables. To find out about dead tuples and free space:
Install extension once per databae:
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How To Populate Serial Key Field Postgres Insert Statement Example
Alternative
If you can afford to create a new table, which would break depending views, foreign keys, ..
Create an empty copy of the old table:
Add the bigserial column:
INSERT data from old table, automatically filling the bigserial:
The new bigserial column is missing in the SELECT of the INSERT and will be filled with its default value automatically. You can spell out all columns and add nextval() to the SELECT list to the same effect. Office 2013 business premium.
Make sure you got all your data in the new table.
Add indexes, constraints, triggers you had in the old table now.
Might be quite a bit faster overall. This leaves you with a vanilla table (and indexes) without any bloat.
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You need free disk space - around the size of the old table, depending on the state of the table - as wiggle room. But you may need just as much with the first simple method because of table bloat. Again, the details depend on the state of your table.
Erwin BrandstetterHow To Populate Serial Key Field Postgres Insert Statement
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