mdbx-tools: добавление опций -d и -p для mdbx_copy.

src/man1/mdbx_copy.1

@@ -14,6 +14,10 @@ mdbx_copy \- MDBX environment copy tool
 [\c
 .BR \-c ]
 [\c
+.BR \-d ]
+[\c
+.BR \-p ]
+[\c
 .BR \-n ]
 .B src_path
 [\c
@@ -45,6 +49,22 @@ or unused pages will be omitted from the copy. This option will
 slow down the backup process as it is more CPU-intensive.
 Currently it fails if the environment has suffered a page leak.
 .TP
+.BR \-d
+Alters geometry to enforce the copy to be a dynamic size DB,
+which could be growth and shrink by reasonable steps on the fly.
+.TP
+.BR \-p
+Use read transaction parking/ousting during copying MVCC-snapshot.
+This allows the writing transaction to oust the read
+transaction used to copy the database if copying takes so long
+that it will interfere with the recycling old MVCC snapshots
+and may lead to an overflow of the database.
+However, if the reading transaction is ousted the copy will
+be aborted until successful completion. Thus, this option
+allows copy the database without interfering with write
+transactions and a threat of database overflow, but at the cost
+that copying will be aborted to prevent such conditions.
+.TP
 .BR \-u
 Warms up the DB before copying via notifying OS kernel of subsequent access to the database pages.
 .TP