Add some clarifications to README.md in the database schema directory. (#6615)

Signed-off-by: Ruben Barkow-Kuder <github@r.z11.de>
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Ruben Barkow-Kuder 2020-02-20 11:37:57 +01:00 committed by GitHub
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Add some clarifications to `README.md` in the database schema directory.

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# Building full schema dumps
# Synapse Database Schemas
These schemas need to be made from a database that has had all background updates run.
These schemas are used as a basis to create brand new Synapse databases, on both
SQLite3 and Postgres.
To do so, use `scripts-dev/make_full_schema.sh`. This will produce
## Building full schema dumps
If you want to recreate these schemas, they need to be made from a database that
has had all background updates run.
To do so, use `scripts-dev/make_full_schema.sh`. This will produce new
`full.sql.postgres ` and `full.sql.sqlite` files.
Ensure postgres is installed and your user has the ability to run bash commands
such as `createdb`.
such as `createdb`, then call
```
./scripts-dev/make_full_schema.sh -p postgres_username -o output_dir/
```
./scripts-dev/make_full_schema.sh -p postgres_username -o output_dir/
There are currently two folders with full-schema snapshots. `16` is a snapshot
from 2015, for historical reference. The other contains the most recent full
schema snapshot.