Oracle

When we use with, Oracle may convert the results in with into a temporary table, which is just possible because the CBO will judge. Inline is not converted to a temporary table, and materialize is coerced into a temporary table.Manufacturing

See deterministic many times, have been very puzzled, today did an experiment. We cheat Oracle to say it is a deterministic function, which is called only once in SQL. If you do not use deterministic, you can see that the values are different. After

Installation steps: Installing the Oracle Instant Client 1) Download instantclient-sdk-macos.x64-11.2.0.4.0.zip and instantclient-basic-macos.x64-11.2.0.4.0zip; and merge their extracted files into a single directory: Instantclient_11_

Major library disk issues, causing the main library to go down because the archive has not been applied, resulting in the repository not being transferred to the primary libraryFirst look at the current information about the repository:Sql> select *

Materialized views Overviewhttp://blog.csdn.net/tianlesoftware/article/details/4713553http://blog.csdn.net/hdhai9451/article/details/3875172Materialized view fast refresh related materialized view loghttps://docs.oracle.com/cd/B10501_01/server.920/a9

This is their own online collection and their usual use of commands and statements (for beginners to learn), if not, please point outI. MySQL (please note that there are spaces between commands)cmd command to start/close the database:net start/stop

The use of views and sequences in Oracle:ViewViews are obtained by querying one or more table definitions, and the table on which the view is defined is referred to as the base table, and the simple point is that the view unites one or more tables

The Java heap and method area are the most memory-intensive areas in the JVM, and are also the focus of monitoring and tuning.Using the JVISUALVM tool, Perm is a permanent generation (Permanent Generation), old is a senior (older Generation), Eden

Original: Oracle 11g sys,system password forgot to set the workaround1. Start Sqlplus2. Please enter your username: Sqlplus/as sysdba3. Enter Password: Direct enter4. Connect to:Oracle Database 11g Enterprise Edition Release

Original: View the name of the Oracle database serverIn Windows1. SelectName fromv$Database;It can be viewed directly by running the2. Check the Tnsnames.ora connection, there is a sid,sid is the service name1. View the installation directory for

One, group function nestingAs defined in Oracle, group functions can be nested only two layers. In fact, multi-layer nesting has no practical purpose, so Oracle does not provide multi-layered nesting of group functions. However, a single-line

Table structure:CREATE TABLE TEST ( ID INTEGER, BIRTHDAY TIMESTAMP);inserting dates into the timestamp type field using JDBCImport Java.sql.connection;import Java.sql.drivermanager;import Java.sql.preparedstatement;import

In order to build a test library in the project, often encounter to clear the current library, is a toss, spare time, write a script to stay as a backup.The script is as follows:Select '--clear table ' from dual union ALL SELECT ' Drop table ' | | A.

Original: Basic syntax for Oracle stored procedures1. Basic StructureCREATE OR REPLACE PROCEDURE Stored procedure name(Parameter 1 in number,Parameter 2 in number) isVariable 1 INTEGER: = 0;Variable 2 DATE;BEGINEND Stored Procedure Name2.SELECT into

system environment:Linux Redhat 6.3 Server 64-bit Database version: oracle11g V11.2 Installation Method: Silent Installation Installation steps: First, the preparatory work: 1.1. Download Oracle 11g on Oracle website, download

Modify Oracle11g Character Set AL32UTF8 to ZHS16GBK This problem occurs during database migration. Source database: oracle11g Personal Edition of win7 64-bit system on your laptop, Character Set ZHS16GBK; target database, HP sqlserver2008 system

TNS-12502: TNS: listener received no CONNECT_DATA from client, ftpclient. connect Check the listening logs of one of our ORACLE databases and find many TNS-12502 error messages. As shown below TNS-12502: TNS:listener received no CONNECT_DATA

Configure and modify CDB and PDB parameters in Oracle12c      1. Configure CDB instance Parameters   The instance parameters for configuring CDB are the same as those for normal instances. You can use alter system to set initialization parameters.

HowtoDiagnoseOracleDataPump-how to add diagnostic information to a Data Pump There are still many bugs in the 11g Data Pump (expdp/impdp), and we often encounter inexplicable card death, which makes people feel overwhelmed. I recently read an

How does Oracle12c connect to CDB and PDB? 1 connect to CDB Same as a normal instance. After specifying ORACLE_SID, you can use OS authentication or password for connection. [Oracle @ Ora12c/] $ echo $ ORACLE_SID Cndba [Oracle @ Ora12c/] $