Oracle-Administration

Run a Consistent Export with expdp FLASHBACK_TIME Purpose A Data Pump export that reads one table at 02:00 and the next at 02:15 is not a consistent snapshot — it is a photograph taken in pieces over time. For schemas where rows in one table reference rows in another, that time spread means the export can capture …

Monitor Data Pump Progress with V$SESSION_LONGOPS Purpose Where the expdp and impdp log files record a status line per completed object — writing output at each table boundary, not while a large table is mid-transfer — V$SESSION_LONGOPS records progress while the operation is still running. That gap matters on a …

Insert Control Characters in vi with Ctrl-V for Oracle Prompts Purpose A custom SQL*Plus prompt that prints the connected instance name in colour, or a login script that clears the screen before the banner, both need one thing the keyboard cannot type directly: a literal control character embedded in the file. Press …

Check RESUMABLE_TIMEOUT and RESUMABLE Status in V$SESSION Purpose V$SESSION carries two columns that tell you whether a session can survive running out of space: RESUMABLE and the resumable timeout that governs it. When resumable space allocation is enabled, a statement that hits a space error — a full tablespace, a …

Monitor PGA Aggregate Target with V$PGASTAT in Oracle Purpose Is PGA_AGGREGATE_TARGET set high enough for the work the instance actually does? V$PGASTAT answers that question. It is the instance-level statistics view for the Program Global Area — the private memory Oracle hands to each server process for sorting, …

Search UNIX Man Pages for Oracle DBA Tools with man -k Purpose Where Google answers most "how do I do X in UNIX" questions for a DBA today, man -k answers the narrower one — what tools the host actually has installed, and what each one does, without leaving the SSH session. Production Oracle hosts often run in …

Enable vi Command-Line Editing in ksh for Oracle DBA Shells Purpose Recalling and editing the prior command without retyping it is the single most-used operation in a long DBA shift on an Oracle host. On the Korn shell (ksh) — the default login shell on AIX 7.x, Solaris 11, HP-UX 11i, and many older Oracle 11g/12c …

Disable vi Autoindent Before Pasting SQL Scripts on Oracle Hosts Purpose Pasting a SQL script copied from email, a Confluence page, or a ticket comment into a vi buffer over SSH — and watching every line shift one indent right of the previous one — is the most common and most frustrating vi failure mode an Oracle DBA …

Scan Every Oracle Alert and Trace Log for ORA- Errors with grep Purpose Every Oracle environment generates alert logs and process trace files recording instance events, errors, and diagnostics. When a support call comes in — "the database was slow last night, can you check the logs?" — the fastest first pass is a …

LIST BACKUPSET OF DATABASE: Oracle RMAN Command Guide Purpose The LIST BACKUPSET OF DATABASE command in Oracle Recovery Manager (RMAN) displays detailed information about all backup sets that contain database datafiles. This command helps database administrators verify backup existence, check backup status, find backup …