[docs] Change in DbMemoryForMemoryOnlyDatabases made by Paul Jordan

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--- tmp/G8dRgijo:63.205.59.62.previous	Sat May 24 00:54:08 2003
+++ tmp/G8dRgijo:63.205.59.62.current	Sat May 24 00:54:08 2003
@@ -14,5 +14,17 @@
 not need to be reinitialized at every connect. Use it for smaller
 tables that will be frequently accessed.
 
+Note: In-Memory tables are read only.
+
 The MEMORY modifier forces IMPORT_ONCE.
 
+B<MIRROR>
+
+Additionally, you can have two tables, the regular table and the memory table by adding to the definition files:
+
+Variable COUNTRY_TABLE         country_memory
+.....
+
+Database country_memory country_memory.txt TAB
+Database country_memory MIRROR          country
+Database country_memory MEMORY          1