X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=schema.sql;h=850e6a9ace316196a494d7a91b77a95f7c21ceb0;hb=b41d7697d060b3675ae160ef8b88c51e642b0c99;hp=8518c4fa7fc2922ae9575b4a50c19a77d3620be6;hpb=da87780779a2f165503d019ee0b59d10e5d31ec8;p=cumulus.git

diff --git a/schema.sql b/schema.sql
index 8518c4f..850e6a9 100644
--- a/schema.sql
+++ b/schema.sql
@@ -3,19 +3,53 @@
 --
 -- 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,
+    intent 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,
+    expire_time integer         -- snapshotid of latest snapshot when expired
+);
+
+-- 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
+    size integer,
+    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
 );
+create unique index segments_used_index
+    on segments_used(snapshotid, segmentid);
+
+-- Overall estimate of segment utilization, for all snapshots combined.
+create view segment_info as
+select segmentid, mtime, size, expire_time,
+       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);