-- This script should be loaded after connecting to the database to be
-- upgraded.
--- Database schema changes: the size column was added to the segments table,
--- and the segments_used table was added. Rather than upgrade the segments
--- table in-place, we create a new table and then rename it over the old
--- segments table.
+-- Database schema changes: the size and mtime columns were added to the
+-- segments table, and the segments_used table was added. Rather than upgrade
+-- the segments table in-place, we create a new table and then rename it over
+-- the old segments table.
create table segments_new (
segmentid integer primary key,
segment text unique not null,
path text,
checksum text,
+ mtime real,
size integer
);
-- Compute the size of each of the segments, if possible, based on our
-- knowledge of the objects stored in them.
insert into segments_new
-select segmentid, segment, path, checksum, size
+select segmentid, segment, path, checksum, mtime, size
from
(select segmentid, segment, path, checksum from segments)
left join
- (select segmentid, sum(size) as size from block_index group by segmentid)
+ (select segmentid, sum(size) as size, max(timestamp) as mtime
+ from block_index group by segmentid)
using (segmentid);
drop table segments;
-- The snapshot_contents table is obsolete.
drop table snapshot_contents;
+
+-- Upgrade database views.
+drop view cleaning_order;
+drop view segment_info;
+
+create view segment_info as
+select segmentid, mtime, size, cast(size * utilization as integer) as used,
+ utilization
+from segments join
+ (select segmentid, max(utilization) as utilization
+ from segments_used group by segmentid)
+using (segmentid);