how to prepare for oracle sql certification

servers extend the capabilities of WINDOWNT by enabling a set of nodes to share work in the same cluster, providing a solution for high availability and highly scalable clusters. If the windowsnt does not meet the needs, the user can move the database to UNIX. Oracle's parallel servers have a fairly high level of integration into the clustering mechanisms of various UNIX platforms.3. Sybase ASEAlthough there is a DB switch to support its parallel server, DB switch is technically immature and on

models are not mature. It is difficult to handle the increasing number of users and data volumes. Scalability is limited. Oracle Parallel servers extend the capabilities of WINDOWNT by enabling a set of nodes to share work in the same cluster, providing high-availability and highly scalable clusters of solutions. If WindowsNT does not meet the needs, users can move the database to UNIX. DB2 DB2 has a good parallelism. The DB2 extends the databas

1. Prepare table DataSelect * fromEmp10;Createsequence Seq_eseqincrement by 1Start with 1001MaxValue999999999;--get a sequence of SQL statementsSelectSeq_eseq.nextval fromsys.dual;--Delete a sequence of SQLDROPSEQUENCE seq_eseq;Create TableEmp10 (empno Number(4)Primary Key, enamevarchar2( -) not NULL, Jobvarchar( -) not NULL, Mgr Number(4), HireDate date,sal Number(5,2), Comm Number(5,2), Deptno Number(2),

enterprises in the world, almost 85% of them use DB2 database servers, and about 5% in China to 97 years. 　　 　　 Scalability and concurrency SQL Server The parallel implementation and coexistence model are not mature. It is difficult to process the increasing number of users and data volumes. Limited scalability. The Oracle Parallel server enables a group of nodes to share the work of the same cluster to ex

Usage scenarios:For example, you need to query all student numbers with scores greater than 95, separated by commas into a string, from the Student score table.To prepare the test data:CREATE TABLE score (ID int,score int)INSERT into score values (1,90)INSERT into score values (2,96)INSERT into score values (3,99)It is now necessary to query the result string "2,,3" with a single statement.The SQL Server st

Configure Oracle Gateway 12 to connect to SQL Server 2014 In recent work, we need to connect to SQL Server 2014 based on Oracle. We can configure Gateway to implement this function. This Gateway is actually implemented through dblink. That is, the SQL Server is simulated int

Label:SQL Server Migration Assistant for Oracle sample (2012-03-12 16:23:24) reproduced Tags: ssma oracle SQL Server It Category: System Introduction: Attempt to migrate Oracle 10GR2 data to SQL Server 2005 (or later). Things to

running 754.2.3 benefits of preprocessing Code 764.2.4 validity verification 784.2.5 control compilation 804.2.6 query variable 814.2.7 concluding remarks on Conditional compilation 824.3 Summary 84Chapter 4 PL/SQL unit test 855.1 why test code 855.2 what is unit test 865.2.1 debug or test 865.2.2 test establishment time 865.3 unit test build tool 875.3.1 utplsql: Use the command line code 875.3.2 quest code Tester for

Package Description:Oracle DBA Database Senior Engineer (lower) SQL language + performance optimization + data replicationHttp://edu.51cto.com/pack/view/id-973.html oracle DBA Database Senior Engineer Training course is the wind brother alone research and development of the fine combat courses, the road map is mainly to let everyone fast employment , high-paying employment. The course content is bas

coexistence model are not mature. It is difficult to process the increasing number of users and data volumes.Limited scalability. OracleThe Parallel Server expands the function of the DRDs instance by allowing a group of nodes to share the work of the same cluster and provides a cluster solution with high availability and scalability.If Windows NT cannot meet your needs, you can move the database to Unix. DB2Good concurrency.Extends database management to a parallel, multi-node environment.

Explain the process and sequence of Oracle SQL statement execution. Step 1: the client sends the statement to the server for execution When we execute an SQL statement on the client, the client sends the SQL statement to the server and allows the server process to process the statement. In other words, the

Comparison of common functions for SQL Server to Oracle 1. Absolute ValueS: Select ABS (-1) ValueO: Select ABS (-1) value from dual 2. INTEGER (large)S: Select ceiling (-1.001) ValueO: Select Ceil (-1.001) value from dual 3. Round (small)S: Select floor (-1.001) ValueO: Select floor (-1.001) value from dual 4. Round (truncation)S: Select cast (-1.002 as INT) ValueO: Select trunc (-1.002) value from dual 5.

, delete, merge, lock, fetch, etc. B) Data definition language statement [Data definition language, DDL], such as create, alter, drop, rename, truncate, grant, revoke, audit, noaudit, comment, etc. C) transaction control statement [transaction control statement], such as commit, rollback, savepoint, and set transaction D) session control statement [session control statement]D.1 perform a specific operation to modify the current SESSION, for example, enabling or disabling the

---- -----A 1B 2C 3G 4Sqlgt; select * from Hkb_test3;X Y---- -----A 1B 2E 3F 4Sqlgt; SELECT * from Hkb_test22 Union3 SELECT * from Hkb_test3;X Y---- -----A 1B 2C 3E 3F 4G 46 Rows selectedSqlgt; SELECT * from Hkb_test22 UNION ALL3 SELECT * from Hkb_test3;X Y---- -----A 1B 2C 3G 4A 1B 2E 3F 48 Rows selected Sql> SELECT * from Hkb_test22 intersect3 SELECT * from Hkb_test3;X Y---- -----A 1B 2Sql> SELECT * from Hkb_test22 minus3 SELECT * from Hkb_test3;X

With SPA, you can play a specific stream based on various types of changes (such as initialization parameter changes, optimizer statistics refresh, and database upgrades)SQL or the entire SQL load, and then generate a comparison report to help you evaluate their impact. In versions earlier than Oracle Database 11g, I must capture all

Tuning collection includes multiple statements to establish a task3 The text of a single SQL statement to create a task4 Create a task by using the corresponding sql_id in the AWR to get the SQL statementThe main use of Dbms_sqltune is to set up a task. Create_tuning_task This function, the function exists rewritten, the following posted out interface1 creating tasks based on

3. An error occurs when the data warehouse routine is started. When you use the abort option to close the database, Oracle will perform the following operations: 1. Stop any user from establishing new connections and stop the current connected user from starting any new transactions. 2. immediately end the SQL statement being executed 3. No uncommitted transactions will be rolled back. 4. Disconnect all us

EXECUTE IMMEDIATE "CREATE TABLE dyn1 (col1 VARCHAR2 (4))";DYNSTMT1 = "INSERT into dyn1 VALUES (' TEST ')";Puts (DYNSTMT1); EXEC SQL EXECUTE IMMEDIATE:d ynstmt1;strncpy (DYNSTMT2, "COMMIT", 10);printf ("%.10s\n", dynstmt2); EXEC SQL EXECUTE IMMEDIATE:d ynstmt2;EXEC SQL COMMIT;/* Here I myself completely input a DROP TABLE dyn1 this string, to try */gets (DYNSTMT4

PL/SQL single-row functions and group functions A function is a program with zero or multiple parameters and a return value. Oracle has a series of built-in functions in SQL, which can be called SQL or PL/SQL statements. functions are mainly divided into two categories:Singl

Article Author: kj021320 Source of information: Evil Octal Information Security team (www.eviloctal.com) Note: This article starts I.S.T.O technical team, after the original creator friendship submits to the evil Octal information Security Team Forum. author:kj021320 Team:i.s.t.o A lot of people say what ASP PHP JSP injection In fact, the most direct injection is related to the database! However, those scripts are just an auxiliary For example, the asp/aspx JSP has no restrictions! and PHP will