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SQL stands for Structured Query Language (pronounced "ess-que-el"). SQL is a language for interacting with databases. It is defined by ANSI as the standard language for relational database management systems (American National Standards Institute).
SQL statements are used to perform tasks like inserting data into a database, deleting or updating data in a database, and retrieving data from a database. Oracle, Sybase, Microsoft SQL Server, Microsoft Access, Ingres, and other relational database management systems that use SQL are just a few examples.
Despite the fact that most database systems use SQL, they frequently incorporate proprietary extensions that are only used on their own platform. "Select," "Insert," "Update," "Delete," "Create," and "Drop" are all standard SQL commands that can be used to perform almost anything with a database.
Normalization is used to split a large and complex table into a simple table and a small table. This helps remove redundant data.
Normally, a table has a lot of unnecessary verbosity, so it's a good idea to split this complex table into several smaller tables that contain only unique information.
First normal form:
The relation schema is 1NF only if:
All attributes in a relation are atomic (indivisible values).
There are no elements or groupings of elements that repeat.
Second normal form:
The relationship exists for 2NF only if:
It is the first normal form.
There is no partial dependency between non-key and key attributes.
Third normal form:
Relation R is called with 3NF only if:
Located at 2NF.
There is no transitive dependency between non-key and key attributes because they are different non-key attributes.
The primary key is a SQL limit. So, before we understand what the primary key is exactly, let's understand what the SQL limits are. Constraints are rules that apply to columns of data in a table. These are used to limit the types of data that can be included in the table. Constraints can be either column-level or table-level.
Let's take a look at the different types of constraints that exist in SQL.
NOT NULL This function prevents a column from having a NULL value.
DEFAULT In the absence of a value, specifies a default value for a column.
UNIQUE Make sure all the values in the UNIQUE column are different
PRIMARY Identifies rows/records within a database table in a unique way.
FOREIGN Uniquely identifies rows / data records in different database tables
CHECK CHECK constraints ensure that all values in a column meet a particular
INDEX A single or group of columns in a table can be used to create an index.
A primary key constraint can be thought of as a combination of a UNIQUE constraint and a NOT NULL constraint. This means that if a column is designated as the primary key, that particular column cannot contain null values, and all values present in that column must also be unique.
Oracle is one of the popular databases provided by Oracle Corporation which works based on relationship management concepts and hence is also known as Oracle RDBMS. Oracle is a business.
Oracle is a database server that maintains data in a highly organised manner. It allows users to store and retrieve related data in a multi-user environment so that multiple users can access the same data concurrently. All of this done at the same time delivers high performance. The database server also protects against unwanted access and provides disaster recovery options. A backup database is a copy of a database created by backing up the primary database.
It is widely used for online transaction processing, data storage and enterprise grid computing.
Oracle software is used to create and manage Oracle databases. Databases are logical and physical structures that hold data about the system, its users, and its controls. The database management software is known as the Oracle database server.
The Oracle database system encompasses both the software that runs Oracle and the database itself. The cache database cache stores data in memory for faster access. The recovery log tracks and stores all changes made to the database. A Data Guard ensures data protection and high data availability, and a control file records the physical structure of the database.
As an Oracle DBA, you can participate in the following jobs:
Installing Oracle software
Create Oracle Database
Monitor and tune performance in small and medium database environments, you may be the only one doing these tasks. In
Work is frequently divided among a number of database administrators in large enterprise environments, each with their own area of expertise, such as a database security administrator or a specialist.
Perform database and software upgrade to new version level
Starting and stopping the database
Manage database storage structure
User management and security
Tables, indexes, and views are examples of schema objects that can be managed.
Backup the database and perform a restore if necessary
Proactively monitor the health of your database and take preventive or remedial action if necessary
What is a trace file and how is it created in Oracle?
A trace file is a file used to store detailed information about exceptions generated by Oracle background processes i.e. bar, low, pmon, smon, etc. They are also commonly created to dump diagnostics and help with debugging and exception resolution in Oracle.
To create a trace file in Oracle:
Set sql_trace = true with the alter session command. This will generate a trace file for all SQL commands issued by your user session. This is a level 1 trace file. Super detailed level 4 trace files can also be created with additional details if needed. These files are saved in the tracking directory as $ORACLE SID ora xxx.trc, where xxx is a sequential number. To create a detailed level 4 tracking file, we need to know the SID and a serial number of the session being tracked. For example, to track a session for SID 5: Connect to the system as sysdba; oradebug SETOSPID 5; oradebug EVENT 10046 TRACE NAME CONTEXT FOREVER, LEVEL 4.
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What is the purpose of saving points in an Oracle database?
The save point is used to split the transaction into smaller phases.
It is used to cancel part of the transaction.
Allow up to 5 save points in Oracle Database.
Whenever there is an error, it is possible to return from the saved point SAVEPOINT
What is dynamic SQL? When to use dynamic SQL?
Dynamic SQL is an enhancement over static SQL. It permits writing SQL queries at run-time. It comes into photo while we want to customise SQL queries for the duration of execution
Few not unusual place instances wherein Dynamic SQL may be utilized:
If database gadgets do now no longer exist at compile-time, we will use dynamic SQL to reference them.
Certain DDL (Data Definition Language) statements and SCL (Session Control Language) Statements aren't supported with the aid of using Static SQL in PL/SQL. These statements may be performed with the aid of using dynamic SQL programming.
Dynamic SQL may be used for executing Dynamic PL/SQL blocks. By the use of EXECUTE IMMEDIATE clause, PL/SQL calls may be decided at runtime.
What are the components of the physical database structure of an Oracle database?
The components of the physical database structure are shown below:
More than one data file.
Two or more redo log files.
One or more control files.
What is an Oracle Index?
The Oracle index is created using one or more columns in the table used to access the rows in the database. These are used to speed up queries that access a small portion of the database. In Oracle, many indexes on a table can access different types of queries.
Which join is used in Oracle 9i?
The joins used in Oracle are interconnects, natural joins, joins with the USING clause, and joins with the ON clause. A cross join produces a product of two tables. Natural joins are used to connect two tables that have similar data. Similar to Equijoin. If the column names are the same but the data types do not match, a join is used using the using clause. Natural join clauses and USING clauses are used internally. You can change the natural join clause by using the USING clause to join the matching data. Joins with the ON clause are used to simplify the code and are also used in columns with other names.
Explain the data type in Oracle?
According to the Oracle database system, there are 15 different data types. They are as follows: CHARACTER or CHAR [length], VARCHAR [length], BOOLEAN, SMALLINT, INTEGER or INT, DECIMAL P S or DEC [(P) S], NUMERI [(P [(S)], REAL, FLOAT (P), DOUBLE PRECISION, DATE, TIME, TIMESTAMP, CLOB [(length)] and BLOB [(length)]. Data type CHARACTER is a string data type and is declared before itself. The minimum size is 1. The maximum size is called a CLOB and has a CHARACTER size that is larger than the table, and the CHARACTER size may not be listed in the database. If no size is specified, 1 is assumed.
The minimum size of VARCHAR is 1, and the maximum size is the same as the size of the table. If the declared value differs from the actual value, truncation occurs and the Oracle database fails. The data type BOOLEAN is true or false. SMALLINT displays numbers from 2 ^ 15 to 2 ^ 151, and values beyond this range are stored in the INTEGER data type. INTEGER is a number of 2 ^ 31 and 2 ^ 311. For DECIMAL data types, the precision and scale are user-specified. A number's precision is the number of digits in it, whereas its scale is the number of digits to the right of the decimal point. The three types of declarations are DECIMAL, DECIMAL (P), and DECIMAL (P, S). NUMERIC is the same as point-based DECIMAL. REAL data is a numeric value with a precision of 64 bits. The FLOAT data type has a maximum value of 64. If no value is specified, it is assumed to be 64. The default range for the FLOAT data type is 126 binary or 38 decimal.
The double precision range is 126 binaries. The format of the data type DATE is year, month, and day. Month values range from 1 to 12, day values range from 1 to 31, and year values start at 0 to 9999. Enclose the date in single quotes, such as DATE`20180416. The time format is HH: MM: SS. This is also written in single quotes and can use optional fractional values to describe nanoseconds. The minute range is 00 and 59, the second range is 00 and 61.999999, and the time range is 0 and 23. TIMESTAMP is a data type with date and time values. Dates and times are indicated by spaces for better understanding. The CLOB data type is data that contains characters longer than CHARACTER OR VARCHAR. BLOBs display binary values. The length of the BLOB data type is 2 gigabytes.
What is a long record? Is it possible to use long records with Oracle?
Long columns can be used in the table and the long columns will be copied to the table while the subquery is in use. Long columns are not included in the group or orderby clause of the Oracle database system. Columns are defined with a ratio of 12 to length, and long columns are defined with dimensions greater than 12.
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