Oracle

In the process of Web development and Oracle installation, people often do not understand the character set, so summarize this. 1. First question: What is the difference between character sets? Common character sets are: UTF-8 and GBK (1) GBK

The Local_listener parameter has two writing formats that provide different functionality.On the listening file, there are dynamic listening ports on both 1521 and 1526 ports.[email protected] admin]$ cat Listener.ora listener= (description=

Select a.file_name,a.autoextensible,a.maxbytes,a.increment_by from Dba_data_files A;Whether the--autoextensible is automatically extended--maxbytes Max--increment_by number of auto-expansion blocksSql> Show Parameter Db_blockNAME TYPE VALUE----------

Compression capabilities for Oracle databasesEveryone heard this word, must have thought of saving hard disk space it. Yes, it is used to do this, but to extend it, it can not only save hard disk space, but also save bandwidth and memory usage (CPU

Original: http://www.cnblogs.com/wujin/archive/2012/02/02/2336055.htmlThere are many application projects, just start with MySQL database can basically achieve a variety of functional requirements, with the increase in application users, data volume

Sql> Select COUNT (*) from v$session #连接数Sql> Select Count (*) from v$session where status= ' ACTIVE ' #并发连接数Sql> Show parameter processes Process: This parameter limits the number of operating system processes that can connect to the SGA (or the

Select Msi.segment1 Material Code,Msi. DESCRIPTION Material Description,PER. Last_Name Buyer,Msi. Full_lead_time lead time,Msi. Fixed_order_quantity Fixed Order quantity,Msi. Minimum_order_quantity Minimum Order quantity,Msi. Fixed_days_supply Fixed

SELECT DISTINCTPLA.PO_HEADER_ID,--pha.type_lookup_code,PHA.SEGMENT1 Purchase order number,Appf.full_name Buyer,Pla.line_num order lines,Msi.segment1 Material Code,Pla.item_description Material Description,CaseWhen Pha. authorization_status= '

CREATE [UNDO] tablespace tablespace_name[DataFile DATEFILE_SPEC1 [, DATEFILE_SPEC2] ...[{mininum EXTENT integer [k|m]| BLOCKSIZE integer [K]|logging clause | Force LOGGING| DEFAULT {data_segment_compression} storage_clause| [Online|offline]|

Install the Sqlplus help command line script in the ORACLE database under $oracle_home/sqlplus/admin/help.As shown below:[Email protected] admin]$ CD $ORACLE _home/sqlplus/admin[Email protected] admin]$ ls-ltrTotal 20-rw-r--r--1 Oracle Oinstall 2118

Rediscover Oracle's Beauty orainstroot.shWhen we install the database software, we will execute orainstroot.sh, and today we will take a closer look at what this script is for.Platform is redhat 6.4 x64 bit, database version is 11.2.0.4.2Here is the

SelectMSI.SEGMENT1 Assembly Parts Code, Msi.description fitting Description, Msi.item_type type, Msi.planner_code Planner, Msi1.segment1 part encoding, Msi1.description part description, msi1.primary_unit_of_measure units--, NVL (BOM.

Both date and timestamp can be added and reduced.There are three ways to manipulate different time types for the current date Gagnin, month, day, hour, minute, and second:1 add hours, minutes and seconds using built-in functions Numtodsinterval2

1./*+all_rows*/indicates that a cost-based optimization method is selected for the statement block, and the best throughput is obtained, minimizing the resource consumption. For example: SELECT/*+all+_rows*/emp_no,emp_nam,dat_in from Bsempms WHERE

recently encountered a requirement to migrate data from a subset of the tables in Oracle to a SQL Server database. But the structure of these tables is somewhat different. method one, using the SQL Develper Data Export tool, export the SQL INSERT

ORA-00937: non-single component group function Error select count(*), t.user_name from sys_user t, sys_department a, sys_dep_type d where t.dep_id = a.dep_id and a.dep_id = d.dep_id and t.recd_is_del = 0group by t.user_nameThe key to this

1. Although each database supports SQL statements, each database also has operation functions supported by each database. These are single-row functions. If you want to develop a database, in addition to SQL statements, you must learn more functions.

Analysis of effective cursor Management [Train of Thought Analysis] The cursor can be understood as a shared execution plan. When SQL is not shared, there are two common solutions: 1. Adjust the size of the Shared Pool (the shared execution plan

Lab requirements:Use of trigger in Experiment 5 Lab Purpose 1. Understand the concepts, functions, and categories of triggers; 2. Master trigger creation and use;   Lab content 1. Create a table orders: used to store the order list information;

Background: The project uses oracle data and tests normally in the development environment. After the project is deployed on the customer's server, the system reports an error when adding data. An error message is output, indicating that the error