49 lines
1.3 KiB
Markdown
49 lines
1.3 KiB
Markdown
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title = "postgresql"
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draft = false
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tags = [
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"code",
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"db",
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"postgresql"
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]
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date = "2013-08-09"
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+++
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# PostgreSQL
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Documentatie: http://www.postgresql.org/docs/9.1/static/view-pg-locks.html
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pgAdmin: http://www.pgadmin.org/
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:exclamation: Heeft géén commit & rollbacks, alles wat uitgevoerd wordt kan niet teruggedraaid worden!
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#### Metadata tabellen bekijken
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##### Alle views van een bepaald schema
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`SELECT count(*) FROM information_schema.views where table_schema = 'public';`, vergeet niet dat `table_schema` `pg_catalog` is voor de metadata tabellen die altijd bestaan in postgres.
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##### Alle kolommen
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Voorbeeld om alle floats te selecteren (kan afrondingsfouten bevatten, gebruik `numeric` in de plaats):
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```sql
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SELECT * FROM information_schema.columns where
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(data_type = 'real' or
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data_type like 'double%')
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and table_schema = 'public'
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and table_name not like 'view_%'
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and table_name not like 'lookup_%';
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```
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#### Dump van DB nemen
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Gebruik hiervoor `pgdump` in bin folder van postgres install dir:
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```
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C:<br/>Program Files<br/>PostgreSQL<br/>9.1<br/>bin>pg_dump --host######10.16.42.35 --port5432 --username######postgres --schemapublic --format=c --schema-only repository.db > postgresdump_20111020.dmp
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```
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Verklaring:
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* `--format`: c (custom), d (directory), t (tar), p (plain text)
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* `--schema`: dump enkel dit stuk
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