Upgrades to utility code for new formats, and a few more database tweaks.

[cumulus.git] / schema.sql

diff --git a/schema.sql b/schema.sql
index 096069b..e0f16a6 100644 (file)
--- a/schema.sql
+++ b/schema.sql
@@ -3,20 +3,49 @@
 --
 -- The index is stored in an SQLite3 database.  This is its schema.
 
--- Index of all blocks which have been stored in a snapshot, by checksum.
+-- List of snapshots which have been created.
+create table snapshots (
+    snapshotid integer primary key,
+    name text not null,
+    scheme text,
+    timestamp real
+);
+
+-- List of segments which have been created.
+create table segments (
+    segmentid integer primary key,
+    segment text unique not null,
+    path text,
+    checksum text,
+    mtime real,
+    size integer
+);
+
+-- Index of all blocks which have been stored, by checksum.
 create table block_index (
     blockid integer primary key,
-    segment text,
-    object text,
+    segmentid integer not null,
+    object text not null,
     checksum text,
     size integer,
-    timestamp real
+    timestamp real,
+    expired integer
 );
 create index block_content_index on block_index(checksum);
-create index block_name_index on block_index(segment, object);
+create unique index block_name_index on block_index(segmentid, object);
 
--- Index tracking which blocks are used by which snapshots.
-create table snapshot_contents (
-    blockid integer,
-    snapshot text
+-- Summary of segment utilization for each snapshots.
+create table segments_used (
+    snapshotid integer not null,
+    segmentid integer not null,
+    utilization real
 );
+
+-- Overall estimate of segment utilization, for all snapshots combined.
+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);