Oracle

Make a request to the Oracle database, modify a row of data, and in memory there are mainly the following changes:1. The server process reads the block containing the row data into memory2. Write the redo log. The variable vectors in memory that

Continuous digital segmentation is required in OracleSimulation data:Fphm JE1001 201002 301003 121005 321006 331007 881009 991010 111011 11As shown in the data, there is an interruption in the middle of the invoice number (FPHM) and we need to

1-Download Instantclient compressed package from official website;2-Unzip the directory and create the Tnsnames.ora file in the root directory with the content:Orcl=(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP) (host= localhost) (PORT =

--Create a tablespace (a table space can have multiple users)--Create Tablespace DemoDataFile ' D:\oracle\oradata\junchen\PLATFORM\demo.dbf 'Size 50mAutoextend on;--Create a user, and associate a tablespace--Create user DemoIdentified by DDDefault

Original Hua KingThe security of the database is a long-standing problem. In the current large number of data breaches and vulnerabilities, we see most of the SQL injection, ultra vires operation, buffer overflow and other specific vulnerabilities.

Create a stored procedure:Create or replace procedure proc_trade (   v_tradeid in tt_ b.number%type,                         --Trading id   v_third_ip in tt_b.varchar2% type,                      --Third party ip   v_third_time in tt_b.date%type ,  

Branch statement/Loop statementV_case Number(3) := -;begin if 2 1 ThenDbms_output.put_line ('conditions established'); elsif4 > 3 Then if 7 6 ThenDbms_output.put_line ('condition not established 1'); End if; elsif6 > 5

Oralce Data typesNumber,varchar2,char,dateStorage encoding for Char and VARCHAR2:Maximum length of char and VARCHAR2:Long and CLOB typesTo create a table:Create statement, creating a tableDESC statement, viewing table structureDefault statement,

[Email protected] ~]$ lsnrctl status Lsnrctl for linux:version 11.2.0.1.0-production on 06-oct-2015 21:10:05 Copyright (c) 1991, Oracle. All rights reserved. Connecting to (Description= (address= (PROTOCOL=IPC) (key=extproc1521)))STATUS of the

Dual is the smallest worksheet provided by Oracle, with a single row and some special functions.Regardless of what you do (don't delete records), it has only one record-' X '.Role:1. Select evaluates constant expression and pseudo-column equivalence.

Materialized View creation Syntax:CREATE materialized VIEW PCTFREE --Storage Parameterspctused --Storage ParametersTablespace --Table SpaceBUILD immediate| deferred--How to createenable| DISABLE query rewrite--support for querying overridesREFRESH

1, Function: Add_months (Date,integer)--Add the specified time to a few monthsFor example:SELECT add_months (sysdate, 1) from DUAL; -The current time plus 1 months, that is, one months after the time.  SELECT add_months (Sysdate,-1) from DUAL; --The

After CDB restarts, PDBs is in mounted state by defaultSql>SelectName,open_mode fromv$pdbs;name Open_mode------------------------------ ----------pdb$seed Read ONLYPDB1 read WRITEPDB2 read W Ritesql>shutdown immediate;database closed. Database

A way to implement Oracle cross-database queries by creating database linkPerform an empowering Dbuser account on the Oracle local database sideSql> Grant CREATE database link to dbuser;Configure the Tnsnames.ora file for the local database server$

Oracle backup scriptOracle9i backup script:Full backup (level 0 ):Bash-3.00 $ more ora9i_rman_bak.sh | grep-v "#"CUSER = 'id | cut-d "("-f2 | cut-d ")"-f1'RMAN_LOG_FILE =$ {0}. outIf [-f "$ RMAN_LOG_FILE"]ThenRm-f "$ RMAN_LOG_FILE"FiEcho> $ RMAN_LOG_

Execution Plan related to B-tree indexesUnique index scan, index range scan, full index scan, quick full index scan, and skip index scan. Unique index scan: SQL> create table employee(gender varchar2(1),employee_id number);Table created.SQL> insert

Oracle functions-numeric Functions1. Evaluate the remainder of the mod (m, n) function. Note: If m or n is null, null is returned. If n is 0, the return value of m is eg: 2. round (m [, n]) rounded. If n is not passed, the default value is 0, which

Find top SQL information through operating system processesSELECT 'username: '| s. username | chr (10) | 'schema: '| s. schemaname | chr (10) | 'osuser: '| s. osuser | chr (10) | 'spid: '| p. spid | chr (10) | 'sid: '| s. sid | chr (10) | 'serial #:

[Oracle] oracle functions-numeric functions, oracle function values I. Numeric Functions 1. mod (m, n) Evaluate the remainder Function NOTE: If m or n is null, null is returned. If n is 0, the value of m is returned. Eg: 2. round (m [, n ])

Oracle row-to-column and column-to-row1. Row-to-column conversion is applicable in some application scenarios, such as student scores. The scores of all students are saved in a table. When we need to display the scores of each student subject in the