By Mike Ault
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The archived redo logs are backed up. 3. The control file is backed up. The first two parts have to be repeated for each tablespace in the database. For small databases, this is relatively easy. For large, complex databases with files spread across several drives, this can become a nightmare if not properly automated in operating system specific command scripts. As you can see, this is a bit more complex than a full cold backup and requires more monitoring than a cold backup. Recovery from this type of backup consists of restoring all tablespaces and logs and then recovering.
An export can only allow recovery to the date and time the export was taken. Imports and exports are accomplished using the Oracle IMPORT and EXPORT utilities. Exports For exports, the EXPORT utility is used. The format for using this command follows: Format: EXP KEYWORD=value —or— KEYWORD=(list of values) Example: EXP AULT/AUTHOR TABLES=(CHAPTERS, EDITORS,ADVANCES) GRANTS=N RAMPANT TECHPRESS EBOOK COPYRIGHT © 2003 RAMPANT TECHPRESS. ALL RIGHTS RESERVED. DMP) import into one extent (Y) export grants (Y) export indexes(Y) export data rows (Y) export table constraints (Y) cross-table consistency (N) log file of screen output (None) analyze objects (ESTIMATE) Bypass the SQLcommand processing layer (N) (new in Oracle8) Show a process meter (a dot) every X rows exported (0 – Xvalue) Shows help listing MLS_LABEL_FORMAT Used with secure Oracle; we won't cover these.
Into line_text from dual; insert into bu_temp values (line_num,line_text); RAMPANT TECHPRESS EBOOK COPYRIGHT © 2003 RAMPANT TECHPRESS. ALL RIGHTS RESERVED. ' 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; --- Now get tablespace names and loop through until all are handled -open get_tbsp; first_tbsp:=TRUE; 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 'REM 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); line_num:=line_num+1; close bbu_com; -RAMPANT TECHPRESS EBOOK COPYRIGHT © 2003 RAMPANT TECHPRESS.