Track and report size of live data in DBs and views

The #full_doc_info record is extended to include the summed size of
leaf revision document bodies and their attachments.  Document sizes
are computed on update; accurate sizes of existing databases and
view groups are only available after compaction.

The document size is defined to be the size of the binary
representation of #doc.body.  The att_len field is used for
attachments; attachments that are shared by multiple revisions of a
document are only counted once.  The size of a view index is defined as
the size of all keys, values, and reductions accessible from the current
root of the tree.

BugzID: 9995

1 files changed, 9 insertions, 0 deletions

diff --git a/apps/couch/include/couch_db.hrl b/apps/couch/include/couch_db.hrl
index b2f02cee..6b3d53a1 100644
--- a/apps/couch/include/couch_db.hrl
+++ b/apps/couch/include/couch_db.hrl
@@ -65,6 +65,7 @@
     {id = <<"">>,
     update_seq = 0,
     deleted = false,
+    data_size = 0,
     rev_tree = []
     }).
 
@@ -298,3 +299,11 @@
     set_timeout_fun,
     stop_fun
 }).
+
+-record(leaf, {
+    deleted,
+    ptr,
+    seq,
+    size = 0,
+    atts = []
+}).