notes/postgres/postgres.md

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2020-01-12 21:28:28 -05:00
setup for single sign on with [SSPI](https://wiki.postgresql.org/wiki/Configuring_for_single_sign-on_using_SSPI_on_Windows)
md5 hash is salted with username in front
Memory
=========================================================
see whats in the buffer cache with pg_buffercache
`CREATE EXTENSION pg_buffercache`
```
SELECT
c.relname,
COUNT(*) AS buffers
FROM
pg_class c
INNER JOIN pg_buffercache b ON
b.relfilenode = c.relfilenode
INNER JOIN pg_database d ON
( b.reldatabase = d.oid
AND d.datname = CURRENT_DATABASE())
GROUP BY
c.relname
ORDER BY
2 DESC
LIMIT 100;
```
Alter Column
==========================================================
ALTER TABLE rlarp.pcore ALTER COLUMN pack SET DATA TYPE numeric USING pack::numeric
psql binary for latest version is always used but pg_dump is not, you have to set the default version in ~/.postgresqlrc