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With the Partitioning, OLAP, Data Mining and Real Application Testing options sys%ORA11GR2> show user USER is "SYS" sys%ORA11GR2> exit $ sqlplus 'ops$tkyte/foobar'@ora11gr2 as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:37:46 2010 Copyright (c) 1982, 2009, Oracle. All rights reserved. ERROR: ORA-01031: insufficient privileges Enter user-name: The reason for this is that OPS$TKYTE is not yet in the password file. In order to get OPS$TKYTE into the password file, we need to regrant that account SYSDBA: $ sqlplus / as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:38:43 2010 With the Partitioning, OLAP, Data Mining and Real Application Testing options sys%ORA11GR2> grant sysdba to ops$tkyte; Grant succeeded. sys%ORA11GR2> exit $ sqlplus 'ops$tkyte/foobar'@ora11gr2 as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:38:53 2010 With the Partitioning, OLAP, Data Mining and Real Application Testing options sys%ORA11GR2> This created an entry in the password file for us, and Oracle will now keep the password in sync. If OPS$TKYTE alters his password, the old one will cease working for remote SYSDBA connections and the new one will start: sys%ORA11GR2> alter user ops$tkyte identified by something_else; User altered. sys%ORA11GR2> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options $ sqlplus 'ops$tkyte/foobar'@ora11gr2 as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Wed Jan 20 16:40:12 2010

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ERROR: ORA-01017: invalid username/password; logon denied Enter user-name: ops$tkyte/something_else@ora11gr2 as sysdba Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options The same process is repeated for any user who was a SYSDBA but is not yet in the password file.

Special nodes are used for true and false at the leaves: we ll write these as T and F Every BDD is constructed with respect to a global variable ordering, so x AND NOT y can be represented as (x => (y => F | T) | F) if x comes before y in this ordering and as (y => F | (x => T | F)) if y comes before x The variable ordering can be critical for performance of the representation BDDs are efficient because they use some of the language representation techniques you saw in 9 In particular, they work by uniquely memoizing all BDD nodes that are identical, which works by representing a BDD as an integer index into a lookup table that stores the real information about the node.

The change-tracking file is a new, optional file for use with Oracle 10g Enterprise Edition and above. The sole purpose of this file is to track what blocks have modified since the last incremental backup. With this, the Recovery Manager (RMAN) tool can back up only the database blocks that have actually been modified without having to read the entire database. In releases prior to Oracle 10g, an incremental backup would have had to read the entire set of database files to find blocks that had been modified since the last incremental backup. So, if you had a 1TB database to which you simply added 500MB of new data (e.g., a data warehouse load), the incremental backup would have read 1TB of data to find that 500MB of new information to back up. So, the incremental backup would have stored significantly less data in the backup, and it would have still read the entire database. In Oracle 10g Enterprise Edition and up, that s no longer the case. As Oracle is running, and as blocks are modified, Oracle optionally maintains a file that tells RMAN what blocks have been changed. Creating this change-tracking file is rather simple and is accomplished via the ALTER DATABASE command: sys%ORA11GR2> alter database enable block change tracking 2 using file 3 '/home/ora11gr2/app/ora11gr2/oradata/orcl/ORCL/changed_blocks.bct'; Database altered.

Caution I ll say this from time to time throughout the book: please bear in mind that commands that set

Furthermore, negative indexes are used to represent the negation of a particular BDD node without creating a separate entry for the negated node Listing 12-15 shows our implementation of BDDs Fully polished BDD packages are often implemented in C It is easy to access those packages from F# using the techniques described in 19 Here we are content with a clear and simple implementation entirely in F# code Listing 12-15 Implementing Binary Decision Diagrams open SystemCollectionsGeneric let memoize f = let tab = new Dictionary<_,_>() fun x -> if tabContainsKey(x) then tab[x] else let res = f x in tab.

parameters, modify the database, or make fundamental changes should not be done lightly, and definitely should be tested prior to performing them on your real system. The preceding command will, in fact, cause the database to do more work. It will consume resources.

To turn off and remove the block change-tracking file, you d use the ALTER DATABASE command once again: sys%ORA11GR2> alter database disable block change tracking; Database altered.