1 -- SQL script for upgrading the local database to the format expected for LBS
4 -- This script should be loaded after connecting to the database to be
7 -- Database schema changes: the size and mtime columns were added to the
8 -- segments table, and the segments_used table was added. Rather than upgrade
9 -- the segments table in-place, we create a new table and then rename it over
10 -- the old segments table.
11 create table segments_new (
12 segmentid integer primary key,
13 segment text unique not null,
20 create table segments_used (
21 snapshotid integer not null,
22 segmentid integer not null,
26 -- Compute the size of each of the segments, if possible, based on our
27 -- knowledge of the objects stored in them.
28 insert into segments_new
29 select segmentid, segment, path, checksum, mtime, size
31 (select segmentid, segment, path, checksum from segments)
33 (select segmentid, sum(size) as size, max(timestamp) as mtime
34 from block_index group by segmentid)
38 alter table segments_new rename to segments;
40 -- Populate the segments_used table based upon data contained in
41 -- snapshot_contents--this is roughly the same calculation that is actually
42 -- done, only now this calculation is done when a snapshot is created.
43 insert into segments_used
44 select snapshotid, segmentid, cast(used as real) / size as utilization
46 (select snapshotid, segmentid, sum(size) as used
47 from snapshot_contents join block_index using (blockid)
48 group by snapshotid, segmentid)
50 (select segmentid, size from segments)
53 -- The snapshot_contents table is obsolete.
54 drop table snapshot_contents;
56 -- Upgrade database views.
57 drop view cleaning_order;
58 drop view segment_info;
60 create view segment_info as
61 select segmentid, mtime, size, cast(size * utilization as integer) as used,
64 (select segmentid, max(utilization) as utilization
65 from segments_used group by segmentid)