Algorithms And Data Structures

Get Approximation Algorithms for NP-Hard Problems PDF

By Dorit Hochbaum

ISBN-10: 0534949681

ISBN-13: 9780534949686

This is often the 1st ebook to totally deal with the learn of approximation algorithms as a device for dealing with intractable difficulties. With chapters contributed by means of prime researchers within the box, this booklet introduces unifying options within the research of approximation algorithms. APPROXIMATION ALGORITHMS FOR NP-HARD difficulties is meant for computing device scientists and operations researchers drawn to particular set of rules implementations, in addition to layout instruments for algorithms. one of the innovations mentioned: using linear programming, primal-dual suggestions in worst-case research, semidefinite programming, computational geometry ideas, randomized algorithms, average-case research, probabilistically checkable proofs and inapproximability, and the Markov Chain Monte Carlo approach. The textual content features a number of pedagogical gains: definitions, routines, open difficulties, thesaurus of difficulties, index, and notes on how most sensible to exploit the publication.

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Hot Backups A hot backup, or one taken while the database is active, can only give a read-consistent copy but doesn’t handle active transactions. You must ensure that all redo logs archived during the backup process are also backed up. The hot backup differs from the cold backup in that only sections of the database are backed up at one time. This is accomplished by using the ALTER command to modify a tablespace’s status to backup. Be sure that you restore the status to normal once the database is backed up or else redo log mismatch and improper archiving/rollbacks can occur.

ALL RIGHTS RESERVED. PAGE 38 DATABASE ADMINISTRATION ROBO BOOKS MONOGRAPH DATABASE ADMINISTRATION line_num := line_num+1; select 'REM ' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num := line_num+1; --- Now get tablespace names and loop through until all are handled -open get_tbsp; loop --- Get name -fetch get_tbsp into tbsp_name; exit when get_tbsp%NOTFOUND; --- Add comments to script showing which tablespace -select 'REM' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; select 'prompt Backup for tablespace '||tbsp_name into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; select 'REM' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; --- Get begin backup command built for this tablespace -open bbu_com (tbsp_name); fetch bbu_com into line_text; insert into bu_temp values (line_num,line_text); close bbu_com; --- The actual backup commands are per datafile, open cursor and loop -open bu_com (tbsp_name); loop fetch bu_com into line_text; exit when bu_com%NOTFOUND; RAMPANT TECHPRESS EBOOK COPYRIGHT © 2003 RAMPANT TECHPRESS.

ALL RIGHTS RESERVED. PAGE 30 DATABASE ADMINISTRATION ROBO BOOKS MONOGRAPH DATABASE ADMINISTRATION end loop; fetch comp_rdo into line_text; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; close tar1_rdo; close tar2_rdo; close comp_rdo; --- Now get all archive logs, performing a switch to be sure all -- required archives are written out -select 'REM' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; select 'REM Backup for archive logs' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; select 'REM' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; select 'alter system switch logfile;' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; select 'archive log all;' into line_text from dual; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; --- The next command builds the actual backup command based on the -- value of the log_archive_dest initialization parameter, it looks for the -- last right square bracket in the name and just uses that section with -- a wildcard -select 'host compress '||substr (value,1,instr(value,'/',-1,1))||'*' into line_text from v$parameter where name='log_archive_dest'; insert into bu_temp values (line_num,line_text); line_num:=line_num+1; RAMPANT TECHPRESS EBOOK COPYRIGHT © 2003 RAMPANT TECHPRESS.

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Approximation Algorithms for NP-Hard Problems by Dorit Hochbaum


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