oracle 12c new features

functionality of this feature, I recommend that you read Oracle magazine's article "Use VPD to keep information private". Policy type The repetitive analysis required to generate a predicate is an overhead that can be trimmed in some cases. For example, in most cases the predicate is not static as Am_name = ' SCOTT ', and it may be more dynamic based on the user's identity, the user's level of authority, and the account manager is reporting to. The

Why should we discuss this issue? It is rooted in history. Let's start with Oracle 10 Gb. Before 11G, if you want to add a new column to a large table and the new column has a default value, if you want to use alter table xx add xx_1 number default 1000; this type of statement settings will be very handy! Its action is to add a column and update the column. If th

Tags: Oracle online convertBefore the Oracle12.2 version, if you want to convert a non-partitioned table to a partitioned table, there are several ways to do this: 1. Build the partition table and insert the data into the partition table with the INSERT into SELECT, 2, use the method of online redefinition (dbms_redefinition). Their currency is: the first method, if the table has frequent DML operations, especially the update operation, you need to st

> alter session set optimizer_use_invisible_indexes = true;Sql> SELECT * FROM test where object_id = 10;Run a plan----------------------------------------------------------Plan Hash value:255872589-----------------------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU) | Time |-----------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 100 | 2

PL/SQL enhancements in Oracle 12c Oracle 12c enhances a series of methods for defining and executing PL/SQL program units. This article covers several new features of Oracle

account After installing Oracle 12c, it comes with a database connectivity tool, SQL Developer, which is also very powerful and has the most versatile tools Plsql Developer and Navicat. We open it: SQL developer cannot be used to create an Oracle database, it can only be used to connect to a database that has already been created, and we typically u

oinstall [[email protected] ~]# groupadd dba [[email protected] ~]# useradd-g oin Stall-g dba Oracle [[email protected] ~]# passwd oracle changing password for user Oracle. New password: Bad password:the password is shorter than 8 characters retype new password: passwd:all

either uppercase or lowercase C # #开头.sql> Create User C # #imei identified by IMEI default tablespace imei temporary tablespace imei_temp; User created.Sql> Grant DBA to C # #imei; Grant succeeded.Each PDB is a separate unit with its own user (local user), tablespace, data file, and each local user has access to its own PDB, and common user can access any PDB as long as the permissions are sufficient.Oracle 12C introduces

course they have been loaded into the memory areaOf After the grouping vectors are constructed, they are "KV0000" and "KV0001", and after combining the tables that need to be grouped, the temporal tables are created, which are "sys_temp_0fd9d6604_116b7c6" and "sys_temp_0fd9d6604_ 116b7c6 ".-The table "Test_big" is accessed, after which the vector groupings are applied to the table. It then starts adding grouping results to the staging table.-the result in a multidimensional array is generated,

steps to be modified:1) Stop OMS (leaving the Admin Server up)2) Modify Sysman password3) Stop All OMS components4) Start OMS5) Login to Oracle emcc-12c with the new passwordThird, modify the Sysman login password#下面是其具体演示[Email protected] ~]$ $OMS _home/bin/emctl Stop OMSOracle Enterprise Manager Cloud Control 12c Re

Tags: images virtual is the database management TOC various Sysstat graphical interface homeOracle database is a leading product in the field of database. It can be said that Oracle database system is currently the world's popular relational database management system, System portability, easy to use, strong function, applicable to all kinds of large, medium, small, microcomputer environment. It is a highly efficient and reliable database solution tha

Label:Oracle column self-increment-identity Columns in Oracle Database 12c Release 1 (12.1)In previous versions of Oracle 12C, if the column was to grow from a sequence + trigger, the new Identity columns feature was introduced into the