Oracle

1. Oracle tracking FileThere are three types of Oracle tracking files: One is the background alarm log file, which records the activity of background processes during database startup, shutdown, and running, such as creating tablespaces, creating

Question 1: Which process is responsible for hard parsing? In addition to low hit rate, what are the other causes of unreasonable shared pool settings?   When it comes to soft parsing (soft prase) and hard parsing (hard prase), it is not worth

1) Prepare test data   If you have less time to talk, go straight to the subject. Create a simple employee table t_hierarchical: |-Emp employee ID |-Direct superiors of Mgr employees (Mgr itself is also an employee) |-Emp_name: employee

1 Overview (In a session) when the transaction starts: When the database encounters the first DML (UPDATE/INSERT/DELETE/MERGE) statement. (In a session) when the transaction ends: the transaction ends at the first COMMIT/ROLLBACK/DDL/GRANT/REVOKE.

The customer requested that the historical data in the database of the two projects on the current network be cleaned up recently, so he sorted out the section usage in the next application, mainly to view the table section. The script used is as

The company asked to check the oracle data of a long-term unattended project and found the following problems. 1. InstallationCurrently, the data is installed on the win2003 system disk and the installation directory is slightly messy. For example,

  The multi-version model of Oracle uses the UNDO data segment to reconstruct the block as is at the beginning of the statement or transaction (depending on the isolation mode. Rollback segments are used cyclically. After a transaction is committed,

  Public void addStatements (StatementsBean statementsBean ){ Try { Session session = this. getSession (); Transaction tran = session. beginTransaction (); StatementsBean. setStatementsContent (Hibernate. createClob (""); // note that the parameter

  Environment: Host XP, 3 GB memory, VMware: ubuntu10.10, hard disk 30 GB, memory 1024 MB   The installation of virtual machines is not explained. There are a lot of online services, Baidu or Google.     1Download oracle10g   Log on to the official

Author: runming QQ: 226399587 http://blog.csdn.net/runming918As an important mechanism in oracle, SCN (System Chang Number) plays an important role in Data recovery, Data Guard, Streams replication, and synchronization between RAC nodes.

OEM:Http: // full computer name: 5500/em/ Sys/System managerScott tiger1. Forget the logon password of a user except SYS and SYSTEM.Log On As a sys (or SYSTEM) user.Conn sys/PASS_WORD as sysdba;Use the following statement to modify the user password.

The deduplication technology can provide a larger backup capacity for longer data retention, continuous verification of backup data, improve the level of data recovery services, and facilitate data disaster tolerance. Duplicate data may be in the

The Oracle database provides several different methods for starting and disabling databases. This article describes the differences between these methods and their respective functions. 1. For most Oracle DBAs, the most common method to start and

ORA-12545 Errors often occur when a remote client connects to the RAC database over a uniform service name. SQL code SQL> CONN NDMAIN @ nuagerac enter the password ****** connected. SQL> CONN NDMAIN @ nuagerac enter password: ***** ERROR: ORA-12545:

Linux hugepage configuration-optimizing oracle memory linux is not as powerful as aix and hp unix, but linux is also very good. To improve linux performance, it uses a lot of io, memory scheduling mechanism. linux uses the memory mode by vm, that is,

Modify the default XDB listening port Oracle9i default xml db to set the default HTTP port to 8080. This is a very common port, which is used by many other webservers, if we have installed it, we 'd better modify it to avoid conflicts. If we don't

Oracle 11G Single Instance uses asm, and test the migration of data files to other disk groups 1. configure/etc/hosts network vi/etc/hosts192.168.1.181 asm asm.oracle.com 1. disable FIREWALL 2. disable SElinux vi/etc/selinux/config => SELINUX =

Use dbms_backup_restore to restore the database test environment: OEL + 11.2.0.1 Instance name: orcl2DBID: 1336959433 scenario: Oracle database storage is broken, data files and control files are all lost, only the backup set of data files, there

Oclumon Help File grid@HQxTAL4A:~> oclumon -hFor help from command line : oclumon -hFor help in interactive mode : -hCurrently supported verbs are :showobjects, dumpnodeview, manage, version, debug, quit, exit, and helpgrid@HQxTAL4A:~> oclumon

Oracle functions and triggers today write about Oracle functions and triggers, define and use stored procedures, functions, and triggers in the database, this improves the efficiency of database access. The database functions include declaration,