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Don t let anyone talk you out of being in ARCHIVELOG mode. You spent a long time developing your application, so you want people to trust it. Losing their data will not instill confidence in your system.

Note There are some cases in which a large DW could justify being in NOARCHIVELOG mode if it made

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let twoBitAdder (x1,x2) (y1,y2) (sum1,sum2) carryInner carry = halfAdder x1 y1 sum1 carryInner &&& fullAdder x2 y2 carryInner sum2 carry Note the close relation between the diagram for the 2-bit adder and its representation as code. You can read the implementation as a specification of the diagram, and vice versa. The types of these functions are, however, a little less informative: val val val val val sumBit : Prop -> Prop -> Prop carryBit : Prop -> Prop -> Prop halfAdder : Prop -> Prop -> Prop -> Prop -> Prop fullAdder : Prop -> Prop -> Prop -> Prop -> Prop -> Prop twoBitAdder : Prop * Prop -> Prop * Prop -> Prop * Prop -> Prop -> Prop -> Prop

judicious use of READ ONLY tablespaces and was willing to fully rebuild any READ WRITE tablespace that suffered a failure by reloading the data.

The password file is an optional file that permits the remote SYSDBA or administrator access to the database. When you attempt to start Oracle, there is no database available that can be consulted to verify passwords. When you start Oracle on the local system (i.e., not over the network, but from the machine the database instance will reside on), Oracle will use the OS to perform the authentication. When Oracle was installed, the person performing the installation was asked to specify a group for the administrators. Normally, on UNIX/Linux, this group will be DBA by default, and OSDBA on Windows. It can be any legitimate group name on that platform, however. That group is special, in that any user in that group can connect to Oracle as SYSDBA without specifying a username or password. For example, in my Oracle 11g Release 2 install, I specified an ora11gr2 group. Anyone in the ora11gr2 group may connect without a username/password: $ groups tkyte ora11gr2 $ sqlplus / as sysdba

In practice, circuits are defined largely with respect to vectors of wires, not just individual wires. You can model these using arrays of propositions, and since it s now clear we re modeling bits via propositions, we make an appropriate type abbreviation for them as well: type bit = Prop type bitvec = bit[] let Lo : bit = False let Hi : bit = True let vec n nm : bitvec = Array.init n (fun i -> var (sprintf "%s%d" nm i)) let bitEq (b1:bit) (b2:bit) = (b1 <=> b2) let AndL l = Seq.fold1 (fun x y-> And(x,y)) l let vecEq (v1:bitvec) (v2:bitvec) = AndL (Array.map2 bitEq v1 v2) These functions have types as follows: type bit = Prop type bitvec = bit [] val Lo : bit val Hi : bit val vec : int -> string -> bitvec val bitEq : bit -> bit -> Prop val AndL : #seq<Prop> -> Prop val vecEq : bitvec -> bitvec -> Prop You can now proceed to define larger circuits. For example: let fourBitAdder (x:bitvec) (y:bitvec) (sum:bitvec) (carry:bitvec) = halfAdder x.[0] y.[0] sum.[0] carry.[0] &&& fullAdder x.[1] y.[1] carry.[0] sum.[1] carry.[1] &&& fullAdder x.[2] y.[2] carry.[1] sum.[2] carry.[2] &&& fullAdder x.[3] y.[3] carry.[2] sum.[3] carry.[3]

SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:17:26 2010 Copyright (c) 1982, 2009, Oracle. All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 112010 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options sys%ORA11GR2> show user USER is "SYS" That worked I m connected and I could now start up this database, shut it down, or perform whatever administration I wanted to But suppose I wanted to perform these operations from another machine, over the network In that case, I would attempt to connect using @tns-connect-string However, this would fail: $ sqlplus /@ora11gr2 as sysdba SQL*Plus: Release 112010 Production on Wed Jan 20 16:19:44 2010 Copyright (c) 1982, 2009, Oracle ERROR: ORA-01031: insufficient privileges OS authentication won t work over the network for SYSDBA, even if the very unsafe (for security reasons) parameter REMOTE_OS_AUTHENT is set to true.