Oracle Database Administration: Oracle DBA Fundamentals

explore the core Oracle database administration tasks, including architecture, planning and creating databases, memory and storage management, managing database users and privileges, and globalization support features.

Explore Oracle server architecture, including the instance and database, memory structures like the SGA, and core files (data, redo log, control), plus connections and sessions.

Explore the Oracle System Global Area (SGA), its shared pool and library cache, dynamic SGA resizing, and how buffer cache sizing, granules, and the data dictionary cache optimize performance.

Understand the redo log buffer as a circular store of data changes and how log_buffer sizing affects recovery, while large pool and java pool optimize shared server and RMAN backups.

Explore the program global area (PGA) as a memory region for a single server or background process, including private SQL areas.

Describe how DBWn writes dirty buffers from the buffer cache to data files and maintains free buffers. Explain LGWR writing log buffers to online redo logs for commit and recovery.

Master how checkpoints write modified buffers to data files, defining the recovery point. Explore archiver, log switches, and archive log mode versus no archive log mode.

Learn how Oracle processes sql statements from parsing and binding to execution and fetch, handles dml and ddl, and manages buffer cache, undo blocks, and transactions.

Explain database files (data, control, online redo log) and memory structures (buffer cache, shared pool, redo log buffer); identify primary background processes and the optional archiver, plus the logical hierarchy.

Explore Oracle server setup and administration tools—Oracle Universal Installer, Database Configuration Assistant, SQL*Plus, and Enterprise Manager—with guidance on starting installers and noninteractive, response-file installations.

Use Oracle Database Configuration Assistant to create, configure, delete databases and manage templates, then learn administrator users and the DBA role, connecting as sis dba or sis oper.

Explore the Oracle Enterprise Manager architecture, including three-tier and two-tier deployments, with consoles, Oracle Management Server, repository, and intelligent agents managing database nodes via a standalone console.

Learn to manage an Oracle instance by creating and configuring initialization parameter files, including the pe file init sid.ora and esp file sid.ora, then start, stop, and monitor diagnostics.

Explain how spfile sid.ora binary file persists parameters across shutdown and startup, how to create it from a PE file with sysdba, and how to export, edit, or reset parameters.

Learn how to start and mount an Oracle database, switch between no mount, mount, and open states, and manage read-only and restricted modes, including using alter database and startup commands.

Master shutdown procedures for Oracle database, including normal, transactional, immediate, and abort modes; understand effects on connections, transactions, instance recovery, and alert log and diagnostic files.

Plan and organize a database by defining its purpose and architecture, create the database with DBCA or manually, apply OFA, and note prerequisites such as sysdba privileges.

Learn password file authentication to grant sysdba access, create and maintain a password file with the password utility, and explore DBCA or SQL script options for database creation.

Learn to create a database using Oracle managed files, configure db_create_file_dest and db_create_online_log_test, troubleshoot creation errors, and review dynamic performance views after creation.

Learn to manually create an Oracle database from the command prompt by configuring a pfile, building data and log files, and running a create database script in SQL Plus.

Learn to manually create an Oracle database by starting the instance and running catalog.sql, catproc.sql, and pupbld.sql, then verify with v$instance and v$database.

Identify built-in database objects and explore the data dictionary and dynamic performance views. Query data dictionary views to access information about schema objects, privileges, and auditing.

Learn to navigate Oracle data dictionary views and dynamic performance views, query and describe v$ tables, and monitor real-time database activity with dynamic performance tables.

Explore data dictionary views such as DBA_OBJECTS, ALL_OBJECTS, and USER_OBJECTS, learning to query owners, object names, and types, and inspect dynamic performance views like V$FIXED_TABLE and V$INSTANCE.

Explore the control file's role in starting and operating an Oracle database and its contents. Learn how to multiplex control files and protect them with RMAN backups.

Learn to multiplex the control file by shutting down database, copying files, updating the pfile, and starting up. See how omf handles control files and how to query their information.

Query control file information using v$ control, v$ parameter, and v$ control_file_record_section, then use show parameter control_files to verify locations for Orcl's control files.

Explain the purpose and structure of online redo log files, including log switches, checkpoints, multiplexing, and how to manage and extend log file groups and members with OMF.

Learn to drop online redo log file groups and members with alter database commands, and relocate, rename, or configure their sizes and place on different disks.

Manage online redo log files with OMF by defining parameters and creating multiplexed log groups with auto-generated members for efficient crash recovery.

Explore redo log management with v$log and v$logfile views, identify active and inactive groups, and understand archived redo log mode, archive log start, and manual versus automatic archiving.

Learn to define tablespaces and data files, create and manage tablespaces (including Oracle managed files), and understand system versus non-system types and locally managed versus dictionary managed space.

Explore locally managed table spaces and the extent management clause. Compare local bitmap management with dictionary managed extents and auto allocate, noting reduced dictionary contention.

Migrate the system tablespace from dictionary managed to locally managed. Configure undo and temporary tablespaces with read-only mode and restricted startup.

Create and set a default temporary tablespace, switch it with alter database, and manage read-only table spaces and related restrictions in Oracle database administration.

Learn how to take a table space offline and perform backups, resize data files, and enable auto extend using SQL and Oracle Enterprise Manager.

Explore resizing and moving Oracle data files, adding and dropping tablespaces, and obtaining tablespace information using alter database, alter table space, and OEM tools.

Explore practical creation of table spaces and data files, including locally and dictionary managed spaces, undo and temporary spaces, with size, extent settings, and the default temporary tablespace.

Manage tablespaces and datafiles by altering read-only, read-write, offline, and online states, adjust storage settings and allocation policy, and inspect details with DBA_TABLESPACES, DBA_DATA_FILES, and the V$ views.

Describe the logical database structure and the uses of segment types, including table, table partition, cluster, index, undo, temporary, lob, nested, and bootstrap segments.

Apply storage clause precedence by segment-level overrides for extent allocation, manage used and free extents, and configure standard and non-standard block sizes to maximize input output performance.

Explore configuring non-standard block sizes in Oracle, including buffer cache initialization parameters and multi-block size caches, creating non-standard block size table spaces, and understanding block contents and automatic space management.

Learn automatic segment space management and how it contrasts with manual data block management, using PCT free and PCT used to guide block utilization and space allocation.

Explore how undo data enables transaction rollback, recovery, and read consistency in Oracle, and compare automatic and manual undo management while detailing undo segments.

Explore system and non-system undo segments, including private and public pools, for manual and automatic undo management. Understand undo tablespaces, initialization parameters, and undo tablespace creation commands in Oracle databases.

Explore automatic undo management and how to alter an undo tablespace by adding data files, switching active undo, and dropping unused undo tablespaces, with Oracle Enterprise Manager and essential parameters.

Configure automatic undo management and size the undo tablespace by combining undo retention, db block size, and undo blocks per second from v$undostat to estimate bytes.

Demonstrates creating an undo tablespace with a 20 m data file at a specified path, then analyzes undo usage via v$undo_stats and related views to gauge space and segments.

Identify methods for storing user data in Oracle databases, including regular, partitioned, index-organized, and clustered tables, and review Oracle built-in scalar data types for character, numeric, and date values.

Explore Oracle built-in data types, including raw, long and long raw, blob, clob, lobs, and bfile, and compare row id, euro id, and universal row id for fast row access.

Explore the ROWID format and the structure of a row in Oracle, detailing data object number, relative file number, block number, and row number for locating rows.

Explore how PCT used and PCT free manage space in data blocks, and how temporary tables, on commit versus preserve rows, and table spaces govern table creation in Oracle.

Modify table storage and extents with alter table and storage parameters, then truncate or drop tables with cascading constraints. Learn manual extent allocation and non partition table reorganization.

Drop a column in Oracle tables, using alter table to remove columns or mark them unused, with checkpoints and undo space considerations.

Demonstrate practical table management in Oracle, including creating tables with various columns and storage clauses, creating temporary tables, altering storage, truncating, and querying DBA_TABLES and DBA_OBJECTS.

Examine how b-tree indexes speed data access, covering single-column and composite indexes, unique and non-unique types, function-based and domain indexes, and how DML affects index entries.

Explore bitmap indexes, which are more compact than b-tree indexes for low cardinality columns, use bitmap segments with start and end row IDs, and support boolean operations in data warehouses.

Learn to create b-tree and bitmap indexes with options for uniqueness, schema, table, column, order, and storage, plus practical guidelines on tablespace, logging, and pct free.

Change index storage parameters with the alter index command, adjusting initrans and maxtrans to improve concurrency and space utilization. Allocate and deallocate index space to manage performance.

Coalesce online and rebuild fragmented indexes to reduce fragmentation, then analyze validity and index stats, and drop unused indexes to boost performance.

Learn practical techniques for creating and managing b-tree and bitmap indexes, including storage parameters and storage extents, and inspect dba_indexes and dba_ind_columns to identify indexes by owner and table.

Learn how to enforce data integrity with declarative integrity constraints—not null, unique, primary key, and check—via enable/disable and validate states, and when to use triggers.

Define immediate and deferred constraint checking, how to set constraints for a transaction, and how deferrable constraints affect commits; cover primary, unique keys via indexes and foreign key enforcement.

Define constraints when creating or altering a table using the constraint clause, covering not null, unique, primary key, and foreign key references; manage deferrable options and enable, disable, or validate.

Learn to enable and validate constraints in Oracle database, handle exceptions, detect and rectify violations, and retrieve constraint metadata for effective data integrity management.

Create and manage table constraints in Oracle database, including primary key, not null, and foreign key, with deferrable and initially deferred options, and query constraint details from the data dictionary.

Explore how Oracle profiles control password security and resource usage, covering password aging, history, complexity, account locking, and how to assign profiles to users for secure, scalable database administration.

Learn how profiles govern password management, including expiration, grace time, and login warnings, with password history, reuse checks, and plsql verification functions.

Alter and drop profiles to set password limits: failed logins, lifetime, grace time, and verify function. Manage resource limits at session and call levels with cascade and initialization parameter controls.

Learn to configure Oracle resource plans and profiles, manage resource limits with the database resource manager, and deploy directives using OEM for effective session and resource control.

Alter the default profile, create and drop profiles, set password life time, grace time, reuse time, and failed login attempts, enable resource limits, and verify with dba_profiles and dba_users.

Create, alter, and drop database users, assign quotas and tablespaces, and configure authentication. Monitor users, enforce resource limits, and grant privileges and roles through schemas.

Create operating system authenticated users with identified externally, set default and temporary tablespaces, and quotas, and view user information via db_users and dba_quotas.

Learn to create a database user with database or operating system authentication, set default and temporary tablespaces, assign quotas, and manage users with alter and drop (cascade) commands.

Identify system and object privileges and learn to grant and revoke them in Oracle, including create session, create table, create any table, and grant with admin option.