67 lines
2.9 KiB
Ruby
67 lines
2.9 KiB
Ruby
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
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# for more information on how to write migrations for GitLab.
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class ReworkRedirectRoutesIndexes < ActiveRecord::Migration[4.2]
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include Gitlab::Database::MigrationHelpers
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# Set this constant to true if this migration requires downtime.
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DOWNTIME = false
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disable_ddl_transaction!
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INDEX_NAME_UNIQUE = "index_redirect_routes_on_path_unique_text_pattern_ops"
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INDEX_NAME_PERM = "index_redirect_routes_on_path_text_pattern_ops_where_permanent"
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INDEX_NAME_TEMP = "index_redirect_routes_on_path_text_pattern_ops_where_temporary"
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OLD_INDEX_NAME_PATH_TPOPS = "index_redirect_routes_on_path_text_pattern_ops"
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OLD_INDEX_NAME_PATH_LOWER = "index_on_redirect_routes_lower_path"
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def up
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disable_statement_timeout do
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# this is a plain btree on a single boolean column. It'll never be
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# selective enough to be valuable.
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if index_exists?(:redirect_routes, :permanent)
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remove_concurrent_index(:redirect_routes, :permanent)
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end
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# If we're on MySQL then the existing index on path is ok. But on
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# Postgres we need to clean things up:
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break unless Gitlab::Database.postgresql?
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if_not_exists = Gitlab::Database.version.to_f >= 9.5 ? "IF NOT EXISTS" : ""
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# Unique index on lower(path) across both types of redirect_routes:
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execute("CREATE UNIQUE INDEX CONCURRENTLY #{if_not_exists} #{INDEX_NAME_UNIQUE} ON redirect_routes (lower(path) varchar_pattern_ops);")
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# Make two indexes on path -- one for permanent and one for temporary routes:
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execute("CREATE INDEX CONCURRENTLY #{if_not_exists} #{INDEX_NAME_PERM} ON redirect_routes (lower(path) varchar_pattern_ops) where (permanent);")
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execute("CREATE INDEX CONCURRENTLY #{if_not_exists} #{INDEX_NAME_TEMP} ON redirect_routes (lower(path) varchar_pattern_ops) where (not permanent or permanent is null) ;")
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# Remove the old indexes:
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# This one needed to be on lower(path) but wasn't so it's replaced with the two above
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execute "DROP INDEX CONCURRENTLY IF EXISTS #{OLD_INDEX_NAME_PATH_TPOPS};"
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# This one isn't needed because we only ever do = and LIKE on this
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# column so the varchar_pattern_ops index is sufficient
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execute "DROP INDEX CONCURRENTLY IF EXISTS #{OLD_INDEX_NAME_PATH_LOWER};"
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end
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end
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def down
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disable_statement_timeout do
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add_concurrent_index(:redirect_routes, :permanent)
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break unless Gitlab::Database.postgresql?
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execute("CREATE INDEX CONCURRENTLY #{OLD_INDEX_NAME_PATH_TPOPS} ON redirect_routes (path varchar_pattern_ops);")
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execute("CREATE INDEX CONCURRENTLY #{OLD_INDEX_NAME_PATH_LOWER} ON redirect_routes (LOWER(path));")
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execute("DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME_UNIQUE};")
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execute("DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME_PERM};")
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execute("DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME_TEMP};")
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end
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end
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end
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