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psqldba

psql - PostgreSQL interactive terminal configuration and utilities

Install

cd ~
git clone https://github.com/s6o/psqldba.git

PATH

Update your PATH environment variable (in .bashrc, .zshrc etc.) and include the $HOME/psqldba/bin directory in PATH.

Don't forget to source (re-load) your changes.

source ~/.zshrc

~/.psqlrc

To get a nicer psql prompt, plus some default configurations (e.g. per database command history stored in ~/psqldba) symlink ~/psqldba/.psqlrc to $HOME directory:

cd ~
ln -s ~/psqldba/.psqlrc

Neovim/VIM integration

The psql can use Neovim or VIM for editing via \e with the pre-requiste that the EDITOR and/or VISUAL environment variable has been set to the respective executable: vim or nvim (in .bashrc, .zshrc etc.).

In addtion Neovim/VIM can be used as PAGER (i.e. command and/or query results are loaded into VIM). To make it easier to use a psql wrapper is provided:

pgvim -U postgres

to start psql with PAGER configured to always on.

If both: Neovim and VIM are installed, Neovim is the default.

psql prompt edit mode

To get vi edit mode support on psql prompt symlink ~/psqldba/.inputrc to your $HOME directory:

cd ~ 
ln -s ~/psqldba/.inputrc

or when you already have an existing .inputrc you can include the respective configuration in you exsiting .inputrc by appending the line:

$include ~/psqldba/.psql-vi-mode

Basic defaults for VIM

For VIM a very basic configuration is provided and can be activated via symlink:

cd ~ 
ln -s ~/psqldba/.vimrc

Using pre-defined SQL queries

The psqldba comes with a few pre-defined SQL queries that can be executed in psql via \i e.g.:

psql -U postgres postgres
\i ~/psqldba/sql/current-database-size.sql

or

psql -U postgres -d postgres -f ~/psqldba/sql/current-database-size.sql

resulting in (something like)

 current_db_size 
-----------------
 8665 kB
(1 row)

Pre-defined Queries

  • connection-count-by-state.sql
  • connections-waiting-for-lock.sql
  • current-database-size.sql
  • index-cache-usage.sql
  • index-sizes-and-health.sql
  • indexes-rearly-used.sql
  • queries-active-and-waiting.sql
  • table-and-index-sizes.sql
  • table-cache-usage.sql
  • table-index-usage.sql
  • table-insert-update-delete-statistics.sql
  • table-sizes.sql
  • transaction-ages.sql

Adding/removing pre-defined functions

psql -U postgres postgres
\i ~/psqldba/functions/create-psqldba-bytea-reverse.sql
\i ~/psqldba/functions/drop-psqldba-bytea-reverse.sql

or

psql -U postgres -d postgres -f ~/psqldba/functions/create-psqldba-bytea-reverse.sql
psql -U postgres -d postgres -f ~/psqldba/functions/drop-psqldba-bytea-reverse.sql

Pre-defined functions

  • psqldba_reverse_bytea(bytea)
  • psqldba_bytea_to_double(bytea, text)

Testing (dry-run) database changes

The psqldba comes with pgtx psql wrapper that allows to dry-run a SQL script by creating a transaction (file ~/psqldba/history/.pgtx) and by default running that file in a single transaction with rollback. For more details:

pgtx