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| + | '''[[PostgreSQL]]''', often simply '''Postgres''', is an [[object-relational database management system]] (ORDBMS). PostgreSQL is [[ACID]]-compliant and [[Transactional]]. PostgreSQL has updatable [[Views]] and [[Materialized view]], [[Triggers]], [[Foreign key]]; supports functions and stored procedures, and other expandability. PostgreSQL listens by default in TCP port 5432. | ||
== Installing PostgreSQL == | == Installing PostgreSQL == | ||
=== MacOS === | === MacOS === | ||
| − | * <code>[[brew install postgres]]</code> | + | * <code>[[brew install postgres]]</code> |
* <code>[[brew install libpq]]</code>: <code>[[psql]]</code> and other 28 binaries. | * <code>[[brew install libpq]]</code>: <code>[[psql]]</code> and other 28 binaries. | ||
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The easiest way to install PostgreSQL in these operating systems is to use their respective built-in package managers - for instance, the <code>pkg</code> command in DragonFlyBSD or <code>apt</code> in Debian and its derivatives. Be advised that there will be different variants of PostgreSQL available for install at a given point, specially regarding version numbers and client/server side. You should decide beforehand which version suits your needs for a particular application. Furthermore, you need to make sure that you have sufficient privileges in the system to install software (properly configured sudo/doas access, for example) or your install will fail. | The easiest way to install PostgreSQL in these operating systems is to use their respective built-in package managers - for instance, the <code>pkg</code> command in DragonFlyBSD or <code>apt</code> in Debian and its derivatives. Be advised that there will be different variants of PostgreSQL available for install at a given point, specially regarding version numbers and client/server side. You should decide beforehand which version suits your needs for a particular application. Furthermore, you need to make sure that you have sufficient privileges in the system to install software (properly configured sudo/doas access, for example) or your install will fail. | ||
* [[Ubuntu]]: <code>[[apt install postgresql]]</code> | * [[Ubuntu]]: <code>[[apt install postgresql]]</code> | ||
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| − | + | == Configuration files == | |
| − | + | /etc/postgresql/10/main/pg_hba.conf | |
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| − | == Configuration | ||
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# "local" is for Unix domain socket connections only | # "local" is for Unix domain socket connections only | ||
local all all md5 | local all all md5 | ||
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== [[PostgreSQL logs]] == | == [[PostgreSQL logs]] == | ||
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== Basic Commands== | == Basic Commands== | ||
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* Connect to a PostgreSQL database: <code>[[psql]] -h localhost -U postgres -d somedb</code><ref>http://postgresguide.com/utilities/psql.html</ref> | * Connect to a PostgreSQL database: <code>[[psql]] -h localhost -U postgres -d somedb</code><ref>http://postgresguide.com/utilities/psql.html</ref> | ||
* Connect to a PostgreSQL database with a timeout of 5 seconds: <code>env PGCONNECT_TIMEOUT=5 psql -h localhost -U postgres -d somedb</code><ref>http://postgresguide.com/utilities/psql.html</ref> | * Connect to a PostgreSQL database with a timeout of 5 seconds: <code>env PGCONNECT_TIMEOUT=5 psql -h localhost -U postgres -d somedb</code><ref>http://postgresguide.com/utilities/psql.html</ref> | ||
| − | * [[Show databases]]: | + | * [[Show databases]]: <code>SELECT datname FROM pg_database WHERE datistemplate = false;</code> |
| − | + | * Show tables: <code>\dt</code> or <code>SELECT * FROM pg_catalog.pg_tables;</code><ref>https://stackoverflow.com/questions/769683/show-tables-in-postgresql</ref> | |
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| − | * Show tables: <code>\dt</code> or <code>SELECT * FROM | ||
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* Drop DB: <code>[[dropdb]] DB_NAME</code> | * Drop DB: <code>[[dropdb]] DB_NAME</code> | ||
* Describe ''employees'' table: <code>\d employees</code> | * Describe ''employees'' table: <code>\d employees</code> | ||
| − | * Show/List | + | * Show/List schemas: <code>select nspname from pg_catalog.pg_namespace;</code><ref>https://dba.stackexchange.com/questions/40045/how-do-i-list-all-schemas-in-postgresql</ref> |
* Show version: <code>[[SELECT version();]]</code> | * Show version: <code>[[SELECT version();]]</code> | ||
| − | * Create backup: use <code>pg_dump</code> <ref>https://www.postgresql.org/docs/current/static/app-pgdump.html</ref> and <code> | + | * Create backup: use <code>pg_dump</code> <ref>https://www.postgresql.org/docs/current/static/app-pgdump.html</ref> and <code>~/.pgpass</code> file for automating login. |
* Create user: | * Create user: | ||
| − | ** <code> | + | ** <code>createuser <username></code> |
** ALTER USER user_name WITH PASSWORD 'new_password'; | ** ALTER USER user_name WITH PASSWORD 'new_password'; | ||
* <code>[[create database]]</code> | * <code>[[create database]]</code> | ||
* Modify user privileges: | * Modify user privileges: | ||
** Privileges to create DB: <code>ALTER USER user1 CREATEDB;</code> | ** Privileges to create DB: <code>ALTER USER user1 CREATEDB;</code> | ||
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== Processs == | == Processs == | ||
* [[wal]] writer process | * [[wal]] writer process | ||
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== Activities == | == Activities == | ||
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== See also == | == See also == | ||
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* {{PostgreSQL}} | * {{PostgreSQL}} | ||
| + | * [[AWS RDS]], [[AWS Redshift]] | ||
| + | * [[Patroni]] [[HA]] solution for PostgreSQL that requires [[etcd]], [[Zookeeper]], or [[Consul]] | ||
| + | * {{DBs}} | ||
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[[Category:Databases]] | [[Category:Databases]] | ||
{{CC license}} | {{CC license}} | ||
Source: wikiversity | Source: wikiversity | ||
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