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small improvements to schema upgrade instructions

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Scott Lamb
2017-01-01 22:58:27 -08:00
parent 0f4c554ec5
commit e1cb5f4204
2 changed files with 6 additions and 6 deletions
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9
guide/schema.md
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@@ -23,7 +23,7 @@ read-only mode prior to deleting the old database.
### Procedure
First ensure there is sufficient space available for three copies of the
First ensure there is sufficient space available for four copies of the
SQLite database:
# the primary copy, which will be upgraded
@@ -31,10 +31,11 @@ SQLite database:
discover a problem while running the new software against the upgraded
database in read-only mode. If disk space is tight, you can save this
to a different filesystem than the primary copy.
# an internal copy made and destroyed by Moonfire NVR and SQLite during the
# internal copies made and destroyed by Moonfire NVR and SQLite during the
upgrade:
* a write-ahead log or rollback journal during earlier stages
* a complete database copy during the final vacuum step
* during earlier steps, possibly duplicate copies of tables, which
may occupy space both in the main database and the journal
* during the final vacuum step, a complete database copy
If disk space is tight, and you are _very careful_, you can skip these
copies with the `--preset-journal=off --no-vacuum` arguments to
the updater. If you aren't confident in your ability to do this, *don't