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Wadhah DAOUEHI

Wadhah DAOUEHI

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Oracle 19c – SQL Access Path: Index Fast Full Scan

By Wadhah DAOUEHI | February 8, 2026 - 7:06 pm |May 31, 2026 Oracle 19c, Oracle Database
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In Oracle Database 19c, the Cost-Based Optimizer (CBO) determines the most efficient method to retrieve … Read More →

Oracle ASM : Monitor Disk Group Space Usage in 19c

By Wadhah DAOUEHI | January 25, 2026 - 2:37 pm |May 31, 2026 Oracle 19c, Oracle Database
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In Oracle 19c environments using ASM (Automatic Storage Management), monitoring disk group space is critical … Read More →

Hourly Redo Activity Analysis Using V$LOG_HISTORY

By Wadhah DAOUEHI | January 11, 2026 - 2:18 pm |May 31, 2026 Oracle 19c, Oracle Database
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Understanding redo generation patterns is essential for Oracle performance monitoring, backup planning, and Data Guard … Read More →

Identify Where Database Time Is Spent (Wait Events + CPU)

By Wadhah DAOUEHI | December 21, 2025 - 2:02 pm |May 31, 2026 Oracle 19c, Oracle Database
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One of the most important tasks for an Oracle DBA is understanding where database time … Read More →

Calculate Real Table Size (Including Indexes, LOBs and LOB indexes)

By Wadhah DAOUEHI | November 30, 2025 - 1:44 pm |May 31, 2026 Oracle Database, SQL
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In Oracle database (starting from 10g), a table’s real storage size is not limited to … Read More →

Oracle 19c: Index-Organized Table (IOT)

By Wadhah DAOUEHI | November 9, 2025 - 7:05 pm |March 9, 2026 Oracle 19c, Oracle Database
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In Oracle Database 19c, tables are typically stored as heap-organized tables, where data rows are … Read More →

Oracle 19c – SQL Access Path: Index Skip Scan

By Wadhah DAOUEHI | November 1, 2025 - 6:44 pm |March 9, 2026 Oracle 19c, Oracle Database, SQL
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In Oracle Database 19c, the Cost-Based Optimizer (CBO) selects the best method to retrieve rows … Read More →

Oracle 19c – SQL Access Path: Index Full Scan

By Wadhah DAOUEHI | October 23, 2025 - 5:30 pm |March 8, 2026 Oracle 19c, Oracle Database, SQL
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In Oracle Database 19c, the Cost-Based Optimizer (CBO) selects the most efficient method to retrieve … Read More →

Oracle 19c – SQL Access Path: Index Range Scan

By Wadhah DAOUEHI | October 15, 2025 - 5:08 pm |March 8, 2026 Oracle 19c, Oracle Database, SQL
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In Oracle Database 19c, the Cost-Based Optimizer (CBO) determines the most efficient way to retrieve … Read More →

Oracle 19c – SQL Access Path: Index Unique Scan

By Wadhah DAOUEHI | October 8, 2025 - 4:48 pm |March 8, 2026 Oracle 19c, SQL
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In Oracle Database 19c, the Cost-Based Optimizer (CBO) selects the most efficient method to retrieve … Read More →

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  • Recent Posts

    • Oracle 19c – SQL Access Path: Index Fast Full Scan
    • Oracle ASM : Monitor Disk Group Space Usage in 19c
    • Hourly Redo Activity Analysis Using V$LOG_HISTORY
    • Identify Where Database Time Is Spent (Wait Events + CPU)
    • Calculate Real Table Size (Including Indexes, LOBs and LOB indexes)
    • Oracle 19c: Index-Organized Table (IOT)
    • Oracle 19c – SQL Access Path: Index Skip Scan
    • Oracle 19c – SQL Access Path: Index Full Scan
    • Oracle 19c – SQL Access Path: Index Range Scan
    • Oracle 19c – SQL Access Path: Index Unique Scan
    • Oracle 19c – SQL Access Path: ROWID Scan
    • Oracle 19c – SQL Access Path: Full Table Scan
    • OS_AUTHENT_PREFIX External Authentication in Oracle Database 19c
    • Oracle 19c Flashback Technology (7/7): Data Archives
    • Oracle 19c Flashback Technology (6/7): Flashback Database/PDB
    • Oracle 19c Flashback Technology (5/7): TRANSACTION
    • Oracle 19c Flashback Technology (4/7): Table
    • Oracle 19c Flashback Technology (3/7): Drop Table
    • Oracle 19c Flashback Technology (2/7): Versions Query
    • Oracle 19c Flashback Technology (1/7): Query
    • Recommended UNDO Tablespace Size in Oracle 19c Using the Undo Advisor (SQL Only)
    • Understanding UNDO Configuration and RETENTION GUARANTEE in Oracle 19c
    • Materialized View Log in Oracle 19c (ON COMMIT)
    • Materialized View Log in Oracle 19c (ON DEMAND)
    • Reinitializing the Same Password After Expiration in Oracle 19c
    • Switching Session User in Oracle Database
    • Monitoring the Oracle Fast Recovery Area (FRA)
    • Database 19c Vault: OWNER/Manager privileges !
    • Enabling the Database Vault (Initialisation parameters)
    • [FATAL] [DBT-09352] Error in validating dbv_owner credentials.
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