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force indicates whether to overwrite existing file (optional); ignorecase specifies whether passwords are case-insensitive (optional); nosysdba indicates whether to shut out the SYSDBA logon (optional Database Vault only). There must be no spaces around the equal-to (=) character. The command we ll use when logged into the operating system account that owns the Oracle software is $ orapwd file=orapw$ORACLE_SID password=bar entries=20 This creates a password file named orapworcl in my case (my ORACLE_SID is orcl). That s the naming convention for this file on most UNIX platforms (see your installation/OS admin guide for details on the naming of this file on your platform), and it resides in the $ORACLE_HOME/dbs directory. On Windows, this file is named PW%ORACLE_SID%.ora and it s located in the %ORACLE_HOME%\database directory. You should navigate to the correct directory prior to running the command to create that file, or move that file into the correct directory afterward.. Now, currently the only user in that file is SYS, even if there are other SYSDBA accounts on that database (they are not in the password file yet). Using that knowledge, however, we can for the first time connect as SYSDBA over the network: $ sqlplus sys/bar@ora11gr2 as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:32:07 2010 Copyright (c) 1982, 2009, Oracle. Connected to an idle instance. idle> All rights reserved.

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Note If you experience an ORA-12505 TNS:listener does not currently know of SID given in connect

Now that you have modeled the initial hardware circuits, you can check simple properties of these circuits. For example, you can check that if you give a fullAdder all low (that is, false) inputs, then the output wires may be low as well and, conversely, that you have a contradiction if one of the output wires is high: > tautology (fullAdder Lo Lo Lo Lo Lo);; val it : bool = true > satisfiable (fullAdder Lo Lo Lo Hi Lo);; val it : bool = false It is of course much better to check these results symbolically by giving symbolic inputs. For example, you can check that if the same value is given to the two inputs of a halfAdder, then the sum output is low and the carry output is the same as the input: > tautology (halfAdder (var "x") (var "x") Lo (var "x"));; val it : bool = true Likewise, you can check that a 2-bit adder is commutative, in other words, that it doesn t matter if you swap the x and y inputs. > tautology (nBitCarryRippleAdder 2 (vec 2 "x") (vec 2 "y") (vec 2 "sum") (vec 3 "carry") === nBitCarryRippleAdder 2 (vec 2 "y") (vec 2 "x") (vec 2 "sum") (vec 3 "carry"));; val it : bool = true However, if you repeat the same for sizes of 5 or bigger, things start to slow down a little, and the naive implementation of propositional logic tautology checking based on truth tables begins to break down. Hence, you have to turn to more efficient techniques for processing propositional formulae.

Descriptor error during this step, that means that the database listener is not configured with a static registration entry for this server. The DBA has not permitted remote SYSDBA connections when the database instance is not up. This will be the case for most Oracle installations for version 9i and above. You would need to configure static server registration in your listener.ora configuration file. Please search for "Configuring Static Service Information" (in quotes) on the OTN (Oracle Technology Network) documentation search page for the version of the database you are using for details on configuring this static service.

We have been authenticated, so we are in. We can now successfully start up, shut down, and remotely administer this database using the SYSDBA account. Now, we have another user, OPS$TKYTE, who has been granted SYSDBA, but will not be able to connect remotely yet: $ sqlplus 'ops$tkyte/foobar' as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:37:35 2010

In practice, propositional formulae to describe hardware can be enormous, involving hundreds of thousands of nodes As a result, hardware companies have an interest in smart algorithms to process these formulae and check them for correctness The circuits in the computers you use from day to day have almost certainly been verified using advanced propositional logic techniques, often using a functional language as the means to drive and control the analysis of the circuits A major advance in the application of symbolic techniques to hardware design occurred in the late 1980s with the discovery of binary decision diagrams, a representation for propositional logic formulae that is compact for many common circuit designs BDDs represent a propositional formula via the use of if .. then .. else conditionals alone, which you write as (variable => true-branch | false-branch).