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Merge branch 'create_pg_indexes' into 'master'

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Rebuild Postgres indexes after a MySQL conversion
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Dmitriy Zaporozhets 2014-05-20 09:10:08 +00:00
commit c05117d9a2
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doc/update/mysql_to_postgresql.md
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@ -1,10 +1,11 @@
# Migrating GitLab from MySQL to Postgres
If you are replacing MySQL with Postgres while keeping GitLab on the same
server all you need to do is to export from MySQL and import into Postgres as
described below. If you are also moving GitLab to another server, or if you are
switching to omnibus-gitlab, you may want to use a GitLab backup file. The
second part of this documents explains the procedure to do this.
server all you need to do is to export from MySQL, import into Postgres and
rebuild the indexes as described below. If you are also moving GitLab to
another server, or if you are switching to omnibus-gitlab, you may want to use
a GitLab backup file. The second part of this documents explains the procedure
to do this.
## Export from MySQL and import into Postgres
@ -15,15 +16,41 @@ sudo service gitlab stop
# Update /home/git/gitlab/config/database.yml
git clone https://github.com/lanyrd/mysql-postgresql-converter.git
git clone https://github.com/gitlabhq/mysql-postgresql-converter.git
cd mysql-postgresql-converter
mysqldump --compatible=postgresql --default-character-set=utf8 -r databasename.mysql -u root gitlabhq_production
python db_converter.py databasename.mysql databasename.psql
psql -f databasename.psql -d gitlabhq_production
# Rebuild indexes (see below)
sudo service gitlab start
```
## Rebuild indexes
The lanyrd database converter script does not preserve all indexes, so we have
to recreate them ourselves after migrating from MySQL. It is not necessary to
shut down GitLab for this process.
```
# Clone the database converter on your Postgres-backed GitLab server
cd /tmp
git clone https://github.com/gitlabhq/mysql-postgresql-converter.git
# Stash changes to db/schema.rb to make sure we can find the right index statements
cd /home/git/gitlab
sudo -u git -H git stash
# Generate the `CREATE INDEX CONCURRENTLY` statements based on schema.rb
cd /tmp/mysql-to-postgresql-converter
ruby index_create_statements.rb /home/git/gitlab/db/schema.rb > index_create_statements.psql
# Execute the SQL statements against the GitLab database
sudo -u git psql -f index_create_statements.psql -d gitlabhq_production
```
## Converting a GitLab backup file from MySQL to Postgres
GitLab backup files (<timestamp>_gitlab_backup.tar) contain a SQL dump. Using
@ -64,5 +91,6 @@ sudo -u git -H python mysql-postgresql-converter/db_converter.py gitlabhq_produc
sudo -u git -H tar rf TIMESTAMP_gitlab_backup.tar db/database.sql
# Done! TIMESTAMP_gitlab_backup.tar can now be restored into a Postgres GitLab installation.
# Done! TIMESTAMP_gitlab_backup.tar can now be restored into a Postgres GitLab
# installation. Remember to recreate the indexes after the import.
```