Full Answer
What are the different types of database objects?
Different database Objects : Table – This database object is used to create a table in database. CREATE TABLE [schema.]table (column datatype [DEFAULT expr] [, ...]); View – This database object is used to create a view in database.A view is a logical table based on a table or another view.
What information is stored in the tables table?
The TABLES table stores information about the tables in the database, including the name, the owner, the number of columns, the size of a row and the primary key (if any). The TABLES table also stores information on system tables.
What is the system catalog in database?
The system catalog consists of tables and views that describe the structure of the database. Sometimes called the data dictionary, these table objects contain everything that the database knows about itself. Each system catalog table contains information about specific elements in the database. Each database has its own system catalog.
What is a database object in DBMS?
Database Objects in DBMS. A database object is any defined object in a database that is used to store or reference data.Anything which we make from create command is known as Database Object.It can be used to hold and manipulate the data.Some of the examples of database objects are : view, sequence, indexes, etc. Different database Objects :
Which database object is used for storing data?
tableA table is the database object that stores data organized in an arrangement of columns and rows.
Where is DB data stored?
Database tables and indexes may be stored on disk in one of a number of forms, including ordered/unordered flat files, ISAM, heap files, hash buckets, or B+ trees. Each form has its own particular advantages and disadvantages. The most commonly used forms are B-trees and ISAM.
Which system view provides a list of all objects in a database?
The sysobjects view contains useful information about the different database objects.
What contains a list of all tables in the database?
The easiest way to find all tables in SQL is to query the INFORMATION_SCHEMA views. You do this by specifying the information schema, then the “tables” view. Here's an example. SELECT table_name, table_schema, table_type FROM information_schema.
Which type of data can be stored in database Mcq?
5. Which type of data can be stored in the database? Explanation: The reason for creating the database management system was to store large data and these data can be of any form image, text, audio, or video files, etc. DBMS allows the users to store and access the data of any format.
What is data storage in database?
A data store is a repository for persistently storing and managing collections of data which include not just repositories like databases, but also simpler store types such as simple files, emails, etc. A database is a series of bytes that is managed by a database management system (DBMS).
How do I list all database objects in SQL Server?
We can use system catalog view sys. objects to view all objects in a SQL database. It has a column type that contains the object category. For example, if we want to search only for the user-defined table, we use 'U' value for the type column.
What are system tables in database?
System Tables are a special type of table in which the SQL Server Engine stores information about the SQL Server instance configurations and objects information, that can be queried using the system views.
What is view table in SQL?
In SQL, a view is a virtual table based on the result-set of an SQL statement. A view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database.
How do I get a list of database tables in SQL Server?
You can query the catalog or INFORMATION_SCHEMA views:SELECT.s.name AS SchemaName.,t.name AS TableName.,c.name AS ColumnName.FROM sys. schemas AS s.JOIN sys. tables AS t ON t. schema_id = s. schema_id.JOIN sys. columns AS c ON c. object_id = t. object_id.ORDER BY.More items...•
How do I get a list of table names in a database?
In MySQL, there are two ways to find the names of all tables, either by using the "show" keyword or by query INFORMATION_SCHEMA. In the case of SQL Server or MSSQL, You can either use sys. tables or INFORMATION_SCHEMA to get all table names for a database.
How do I get a list of table names in MySQL?
The syntax to get all table names with the help of SELECT statement. mysql> use test; Database changed mysql> SELECT Table_name as TablesName from information_schema. tables where table_schema = 'test'; Output with the name of the three tables.
How is data stored in a DBMS?
The data storage in DBMS is done in the form of a file. Tables are used to store data in RDBMS. In DBMS, the data is stored in a navigational format or using a hierarchical arrangement. The tables which are used by RDBMS stores the data in the form of rows and columns.
Where is the data stored in mysql database?
Information managed by the MySQL server is stored under a directory known as the data directory.
How are records stored in a database?
A record in a database is an object that can contain one or more values. Groups of records are then saved in a table; the table defines the data that each record may contain. In a given database, there are multiple tables, each containing multiple records. Think of the rows and columns of a typical spreadsheet.
How is data entered into a database?
You can use SQL (Structured Query Language) to insert data. This is a common way of adding certain types of data across large systems, often within multiple environments. In fact, database developers often create SQL scripts that create a whole database, and insert data at the same time.
What is a SYS.DBA_TABLES view?from docs.oracle.com
The SYS.DBA_TABLES view describes all tables in the database. See "SYS.ALL_TABLES" for column descriptions.
What is table in Oracle?from docs.oracle.com
Tables are the basic unit of data storage in Oracle HCM Cloud, where data is stored in rows and columns. For example, the PER_ASG_RESPONSIBILITIES table stores general information about a person's areas of responsibility defined by reference to existing workforce structures. This table stores attributes such as start and end date of responsibility, type of responsibility, status, organization, location, and assignment category.
What is SYS.ALL_VIEWS?from docs.oracle.com
The SYS.ALL_VIEWS view describes all views accessible to the current user. The column names and data types are the same as the Oracle database. TimesTen returns NULL for some columns that are not supported in TimesTen. You should ignore such columns. See the Description column in the Columns table.
What is all_tables view?from docs.oracle.com
The ALL_TABLES view describes all tables accessible to the current user. The column names and data types are the same as the Oracle Database. TimesTen returns NULL for some columns that are not supported in TimesTen. You should ignore such columns. See the Description column in the Columns table.
What is a DBA_IDENTIFIERS?from docs.oracle.com
DBA_IDENTIFIERS displays information about the identifiers in all stored objects in the database. It has the same columns as SYS.ALL_IDENTIFIERS.
Where is Timesten stored?from docs.oracle.com
TimesTen stores metadata (information about the contents of your database) in system tables in your database.
What is a DBA source?from docs.oracle.com
DBA_SOURCE describes the text source of all stored objects. It has the same columns as SYS.ALL_SOURCE.
What is a SYS.DBA_TABLES view?
The SYS.DBA_TABLES view describes all tables in the database. See "SYS.ALL_TABLES" for column descriptions.
What is a DBA stored setting?
DBA_STORED_SETTINGS describes the persistent parameter settings for stored PL/SQL units for which the current user has execute privileges. It also returns parameter information for all objects in the database. It has the same columns as SYS.ALL_STORED_SETTINGS.
What is SYS.ALL_VIEWS?
The SYS.ALL_VIEWS view describes all views accessible to the current user. The column names and data types are the same as the Oracle database. TimesTen returns NULL for some columns that are not supported in TimesTen. You should ignore such columns. See the Description column in the Columns table.
What is all_tables view?
The ALL_TABLES view describes all tables accessible to the current user. The column names and data types are the same as the Oracle Database. TimesTen returns NULL for some columns that are not supported in TimesTen. You should ignore such columns. See the Description column in the Columns table.
What is a DBA_IDENTIFIERS?
DBA_IDENTIFIERS displays information about the identifiers in all stored objects in the database. It has the same columns as SYS.ALL_IDENTIFIERS.
What is a DBA object?
DBA_OBJECTS describes all objects in the database. It has the same columns as SYS.ALL_OBJECTS.
What is the DBA tab size?
The DBA_TAB_SIZES view contains information about the size of tables that are available in the database. Requires ADMIN privileges. It has the same columns as SYS.ALL_TAB_SIZES.
System tables
Starting with version 1.16, RethinkDB maintains special system tables that contain configuration and status information about servers, databases, individual tables, and issues with the cluster. Querying system tables returns information about the status of the cluster and current objects (such as servers and tables) within the cluster.
Overview
Access the system tables through the rethinkdb database. These tables aren’t real RethinkDB document stores the way user-created tables are, but rather “table-like” interfaces to the system allowing most ReQL commands to be used for control. System tables cannot be created, dropped, reconfigured, or renamed.
Status tables
All the status tables are read-only. Some of the information in status tables is also returned in config tables (such as object names and UUIDs).
What is a table view?
For a table, or a view of one table, the name of the table space that contains the table. For a view of more than one table, the name of a table space that contains one of the tables. For a created temporary table, a view of a view, or an alias, it is SYSTSTAB. G.
What is a table with no constraint?
The table has no unique constraint (primary key or unique key), the table is a catalog table, or the row describes a view or alias. The definition of the table, view, or alias is complete. G. KEYOBID.
How many bytes are in the number 8?
The number 8 accounts for the header (6 bytes) and the ID map entry (2 bytes).
What is the default value of Runstats?
The default value is '0001-01-01-00.00.00.000000'. The default value indicates that statistics were not collected. This is an updatable column.
What is internal DB2?
Internal Db2 identifier of the index that enforces uniqueness of the primary key of the table; 0 if not applicable.
What does 0 mean in a table?
The value is 0 if the row describes a view, alias, or auxiliary table. For maximum row and record sizes, see the note on the maximum record size in CREATE TABLE.
Is DATACAPTURE always blank?
For a created temporary table, DATACAPTURE is always blank.
What is a SYS.DBA_TABLES view?from docs.oracle.com
The SYS.DBA_TABLES view describes all tables in the database. See "SYS.ALL_TABLES" for column descriptions.
What is a DBA stored setting?from docs.oracle.com
DBA_STORED_SETTINGS describes the persistent parameter settings for stored PL/SQL units for which the current user has execute privileges. It also returns parameter information for all objects in the database. It has the same columns as SYS.ALL_STORED_SETTINGS.
What is SYS.ALL_VIEWS?from docs.oracle.com
The SYS.ALL_VIEWS view describes all views accessible to the current user. The column names and data types are the same as the Oracle database. TimesTen returns NULL for some columns that are not supported in TimesTen. You should ignore such columns. See the Description column in the Columns table.
What is all_tables view?from docs.oracle.com
The ALL_TABLES view describes all tables accessible to the current user. The column names and data types are the same as the Oracle Database. TimesTen returns NULL for some columns that are not supported in TimesTen. You should ignore such columns. See the Description column in the Columns table.
What is a DBA_IDENTIFIERS?from docs.oracle.com
DBA_IDENTIFIERS displays information about the identifiers in all stored objects in the database. It has the same columns as SYS.ALL_IDENTIFIERS.
Where is Timesten stored?from docs.oracle.com
TimesTen stores metadata (information about the contents of your database) in system tables in your database.
What is the DBA tab size?from docs.oracle.com
The DBA_TAB_SIZES view contains information about the size of tables that are available in the database. Requires ADMIN privileges. It has the same columns as SYS.ALL_TAB_SIZES.
What are the objects in a database?
Database Objects in DBMS 1 Table – Basic unit of storage; composed rows and columns 2 View – Logically represents subsets of data from one or more tables 3 Sequence – Generates primary key values 4 Index – Improves the performance of some queries 5 Synonym – Alternative name for an object
What is index in Oracle?
If you do not have an index on the column, then a full table scan occurs. An index provides direct and fast access to rows in a table. Its purpose is to reduce the necessity of disk I/O by using an indexed path to locate data quickly. The index is used and maintained automatically by the Oracle server.
