How can I get all sequences in an Oracle database?

Views: find your sequence in the crowd

It's a jungle out there with different sequence views. Let's untangle:

DBA_SEQUENCES

• Jungle guide: Shows everything in the database
• Credentials: You need to be the DBA royalty
• Ideal scenario: When you need to see all sequences out there

USER_SEQUENCES

• Jungle guide: Just your sequences. No more, no less
• Credentials: You, yes you. No special access required
• Ideal scenario: When you're into self-reflection

ALL_SEQUENCES

• Jungle guide: All sequences you can possibly interact with
• Credentials: Anybody can view, but your seeing power is limited to your access
• Ideal scenario: When you're into networking and want to know your options

So, remember to go easy on SELECT * to avoid overloading your system. Your glorious details are a few keystrokes away!

Spectator's access: in case you're not the king

No DBA access? No worries! You still have your share of sequence info:

-- Just sequence names. Because who needs all the details?
SELECT sequence_name FROM all_sequences;

-- Let's dig deeper into a sequence
SELECT increment_by, last_number FROM user_sequences WHERE sequence_name = 'YOUR_SEQUENCE_NAME';
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Reality check: handle your permissions and system efficiency

Check your database roles before snagging that DBA_SEQUENCES view. It's VIP access, you know!

And efficiency is key. Aim for an optimized query, so your system doesn't crash on you:

-- Precision is an art. Let's master it!
SELECT sequence_owner, sequence_name, min_value, max_value, increment_by FROM dba_sequences;
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Why need Google glasses when you can code?

Visual tools like Toad for Oracle, pretty as they are, are not always needed. Your SQL queries and command-line skills are pretty cool too!

Cheatsheet for common problems

Synchronicity: Is the sequence lost in time?

Check if your sequence is lagging behind or running ahead:

-- Time travel alert!
SELECT 'Sequence out of sync!' AS Error
FROM dual
WHERE (SELECT MAX(id) FROM your_table) <> (SELECT last_number FROM user_sequences WHERE sequence_name = 'YOUR_SEQUENCE');
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Being a minimalist: Few sequences used often

Spot sequences overworking while others chill:

-- Laziness rating of sequences
SELECT sequence_owner, sequence_name, last_number
FROM dba_sequences
WHERE last_number < 10;
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Avoiding sequence exhaustion

Don't let your sequences run out of numbers:

-- "Sequence, how much more can you count?"
SELECT sequence_name, max_value, last_number,
       ROUND((last_number/max_value)*100, 2) AS "Life Remaining %"
FROM all_sequences
WHERE max_value - last_number < SOME_THRESHOLD;
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