Oracle冷备脚本: set feedback off set heading off set verify off set trimspool off set echo off set time off set timin
Oracle冷备脚本:
set feedback off
set heading off
set verify off
set trimspool off
set echo off
set time off
set timing off
set pagesize 0
set linesize 200
define dir='/backup/cold/mike';
define diroutmike='/u01/scripts/coldscr/mikecoldout.sql';
spool &diroutmike
select '!cp '||name||' &dir' from v$datafile order by file#;
select '!cp '||name||' &dir' from v$controlfile;
spool off;
shutdown immediate;
@&diroutmike
startup;
以上脚本放在/u01/scripts/coldscr/mikecold.sql
在数据库运行时可以运行此脚本来冷备。
Oracle热备脚本:
set feedback off
set pagesize 0
set heading off
set verify off
set linesize 100
set trimspool on
set echo off
set time off
set timing off
undefine mikedir
undefine mikescp
define mikedir='/backup/hot'
define mikescp='/u01/scripts/hotscr/mikehotout.sql'
declare
cursor cur_tablespace is select tablespace_name from dba_tablespaces where status 'READ ONLY' a
nd contents not like '%TEMP%';
cursor cur_datafile(tn varchar2) is select file_name from dba_data_files where tablespace_name=tn;
begin
for ct in cur_tablespace loop
dbms_output.put_line('alter tablespace '||ct.tablespace_name||' begin backup;');
for cd in cur_datafile(ct.tablespace_name) loop
dbms_output.put_line('! cp '||cd.file_name||' &mikedir');
end loop;
dbms_output.put_line('alter tablespace '||ct.tablespace_name||' end backup;');
end loop;
end;
/
以上脚本放在/u01/scripts/hotscr/mikehot.sql
在数据库运行时可以运行此脚本来热备。

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

Notepad++7.3.1
Easy-to-use and free code editor

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
