Oracle

The Management Mechanism of oracle buffer blocks has never been officially released. Therefore, many experienced oracle engineers infer the management mechanism of oracle buffer blocks through experience or comments in oracle documents. In fact,

Oracle relational database system has been widely used for its excellent performance. Ensuring database security is an important part of database management. This article provides a detailed introduction to the creation, use, and maintenance of the

1. Basic knowledge of database principles, concepts of rows and columns, and knowledge of relational databases are required. 2. You have an environment learning database, such as an XP installation, a company minicomputer, or a PC, linux,

4 GB Server MemoryModify the/etc/sysctl. conf file (ROOT account) Kernel. shmmax = 2147483648// Formula: 2G * 1024*1024*1024 = 2147483648 (bytes)// Indicates the maximum shared memory. If it is small, it can be determined based on the actual

I assembled the European language version for windows, and the international language version is 60 MB. Because it was just installed, the default database character set is AL32UTF 8. The character set used by the company is ZHS16GBK, so the

When studying Oracle, you may encounter oracle tablespace recovery problems. Here we will introduce the solutions to Oracle tablespace recovery problems. Here we will share with you.Oracle tablespace recovery planI. User tablespaceError:A ora-01157,

3.2 Filter attributes The filter is responsible for converting data in various file formats into plain text formats. Other components in the indexing pipeline can only process plain text data and cannot recognize microsoft word or excel file formats.

Oracle is the world's leading information management software developer and is well known for its complex relational database products. This article introduces the Oracle optimizer, which is a very useful tool. Before executing an SQL statement,

Oracle pessimistic lock VS optimistic lockPessimistic lock: It is pessimistic that the data has been modified by other threads during the process from data extraction to modification submission, which will lead to loss of updates. Therefore, the row

For Cluster tables, you must first create a cluster segment ). Then, associate the table to the cluster segment. The cluster Table is also a virtual table with no corresponding segment. The cluster table corresponds to the cluster segment. There are

New version of shipping oracle SQL statements [SQL] 1. connection: conn system/manager; 2. create user: create user shipping identified by shipping123; 3. grant all permissions: grant dba, connect, resource to shipping; 4. A common sequence create

Several commands required to understand the Oracle physical system 1. display the parameters related to the rollback segment ChenZw> show parameter undo name type value =---------------- undo_management string AUTOundo_retention integer

Solve ORA-00060: Deadlock detected small instance database version: SQL > select * from v$version;BANNER----------------------------------------------------------------Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64biPL/SQL Release 10.

The node cannot be displayed when 11g r2 is installed. cluster configuration cannot be modified solves the problem that no node is displayed when rac 11.2.0.3 is installed on two AIX hosts with Oracle RAC 10g deleted today, prompting Vendor

SQL Optimization-Beware of error associations when writing SQL statements, when joining multiple tables, it is sometimes easy to write an error in the association relationship. In general, this problem is easy to find, but if the SQL statement is

Oracle memory-Spur (4) if you start an automatically managed pga, You need to configure two parameters: pga_aggregate_target and workarea_size_policy. I learned these parameters before, however, when creating a new database, you can set the

Find out the program corresponding to the oracle session based on the memory usage. Generally, it feels that the oracle database is slow. First, find the process with the largest memory and CPU occupied by the AIX operating system, then, the process

Oracle accidental deletion and recovery Query deleted datarows: select * from table name as of timestamp to_timestamp ('delete time point', 'yyyy-mm-dd hh24: mi: ss ') // Needs Auth [flash any table] data table flashback: alter table name enable row

Oracle does not have to delete Archivelog directly from the OS layer, because the relevant information of Archivelog is recorded in controlfile, and the setting of controlfile is not changed after the physical deletion. In addition, when querying

Oracle-full recovery of user management (2) full recovery of User Management (1) describes full recovery in non-archive mode. The following describes full recovery in archive mode. I. full recovery in archive Mode 1. in full recovery in archive mode,