Questions tagged [uuid]

A Universally Unique Identifier (UUID), GUID in Microsoft parlance.

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Handling insert errors caused by default values [closed]

I would like to automatically add unique random UUIDs to a table. CREATE EXTENSION pgcrypto; CREATE TABLE person ( id SERIAL PRIMARY KEY, uuid UUID UNIQUE DEFAULT get_random_uuid (), name ...
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1answer
84 views

PostgreSQL: what are purpose of functions uuid_hash(uuid) and uuid_hash_extended(uuid, bigint)

Functions uuid_hash and uuid_hash_extended Exploring postgresql I discovered 2 functions that looks interesting: SELECT p.proname , obj_description(p.oid) AS func_desc, ...
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30 views

Add jsonb key/value pair with uuid

I am trying to add a new key value pair to a jsonb array and I am having some difficulties in doing it. What I am trying to add is a key id with a uuid value This is how my data looks right now: { ...
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UPDATE with UUID() sets all rows with the same value

Having a table t1 with the field f1 BINARY(16) the following command updates all rows with the same uuid value. UPDATE t1 SET f1 = UNHEX(REPLACE(UUID(), '-', '')); OK, somehow I must have totally ...
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33 views

How to assign GUID to batches of data based on row counts and tunable batch size

I need to assign batches of rows a common GUID id (for consumption by an external process). Below is a simplified setup describing what I'm looking for: BASE_TABLE represents one of pre-existing ...
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36 views

About UUID and generators in PostgreSQL

I'm thinking to use UUID as PK for all tables into my new PostgreSQL database, for such a goal I will be using uuid_generate_v5 and uuid_ns_dns or uuid_ns_url functions, but I have some doubts: is ...
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153 views

MariaDB Uuid as Primary Key Performance Problem / Tweaks

im upgrading our mariadb database from PRIMARY KEY INT AUTO_INCREMENT to UUID PRIMARY KEY. We have around 80 tables with multiple relations between them. I've build a migration script to change the id ...
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is it relatively safe to union two tables with UUID PK? [closed]

I want to union two tables whose primary keys are UUID(V4) and I want to preserve them in the result. I work with PostgreSQL Is it safe to do this? What are the pitfalls may be encountered?
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302 views

How to set uuid-ossp as a default extension for whole server?

I installed uuid-ossp for the default PostgreSQL database (postgres) using the following sql commands but whenever I create a new database I am forced to run the same commands once again for every new ...
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1answer
763 views

Why is there no max(uuid)/min(uuid) function?

Why can I use a UUID to sort rows: SELECT uuid_nil() ORDER BY 1; But I cannot compute the maximum value: SELECT max(uuid_nil()); [42883] ERROR: function max(uuid) does not exist Hint: No function ...
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Should I convert the frontend generated UUIDv6 to binary(16) for use in SQL Server as the clustered primary key?

Background As suggested by the front-end developer, I looked into using UUID as the primary key for a bunch of tables in our new system. From learning the pros and cons of random vs. sequential UUIDs, ...
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MySQL UUID() behavior

4 years ago, I answered a question on SO, "how to set an UUID for each row in bulk". I answered, after trying it, UPDATE table SET uuidcol = UUID(); It worked for me, but about half (it ...
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61 views

Best practice for exposing record IDs to API users

I am extending an API to include the ability to retrieve and update a specific record after the record is created by the user. Currently, these records are created with an auto generated integer key,...
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1k views

generate array of unique uuid in postgreSQL

I would like to insert array of unique uuid values in table with uuid column as primary key. Table structure is CREATE TABLE Organisation (uuid id PRIMARY KEY DEFAULT uuid_generate_v4()); e.g. I ...
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GUID vs Identity on a table performance [duplicate]

My question is using a guid(data type unique identifier) versus using identity specification(data type int). Are there any articles where it talks about why you would use one versus another? I'm at a ...
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1answer
2k views

UUID or BIGSERIAL Foreign Keys Postgres

I have 8 tables which use UUID Primary Keys and 7 of them have UUID Foreign Keys. Would it be better for performance to use BIGSERIAL instead of UUID?
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ID, UUID and “deleted_at” columns, How to avoid performance degradation?

Consider this table, but with thousands of records, on PostgreSQL: | id | uuid | color | ... | deleted_at | |----|---------|----------|-----|---------------------| | 1 | 4fc1... | red ...
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SQL Server Partition. How would splitting range with Guid work?

I have a very large table in my database, and it has a GUID column called Group_Id. This Group_Id has a pretty even split of data, and it would be beneficial to partition the table by this column. ...
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281 views

Universally converting UUID to IDs

what are the best practices in Postgres for globally converting UUIDs into IDs. I'm currently using both UUIDs and IDs in my schema. The intent is for UUIDs to be exposed to the public (for URLs et.) ...
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1answer
118 views

UUID as primary key and download ID

I'm designing a Django Rest Framework API with PostgreSQL. In the database I'll be recording information about documents which can be requested for download. I want the request to include a unique id, ...
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1answer
280 views

UUID array declared in stored procedure, on access throws explicit type casts needed

I have a stored procedure where I have declared an array of UUIDs, on using that variable, it throws casting exception. create or replace function test.test_function(max integer, interval interval) ...
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1answer
64 views

Where clause in select does not work with Inequality of guid

I want to query our CRM Db. I have a backup of CRM Db and the existing one. There is a custom entity,in both of them I have created. Some of my custom entity records has deleted from the existing db. ...
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1answer
3k views

Cannot run 'uuid-ossp' functions even when it's activated

I want to generate a v4 uuid in PostgreSQL using the extension uuid-ossp, so in psql I ran: CREATE EXTENSION "uuid-ossp"; Then I ran SELECT uuid_generate_v1(); or SELECT uuid_generate_v4(); but I ...
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56 views

NON-Random UUID keys in custom distributed DB

Is there any reason other than security for using random (or even semi-random) UUIDs as primary keys to database records? Is there any reason why I should not WANT to be able to use the UUID to ...
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1k views

best index type for uuid in postgres 11

I realize a similar question has been asked multiple times but all the ones I can find are from 2014/2015 and many versions of postgres ago. I'm on postgres 11. I'm introducing a new primary key for ...
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How to pass array of UUIDs *OR* empty array and return implicit (inner join)?

How would I pass a list that is either full of UUIDs or empty, then return only joined records with those id values or all records if empty? This question (Casting an array of texts to an array of ...
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1answer
5k views

Postgres support for UUID [closed]

My understanding is that Postgres supports UUID data type out-of-the-box. I'm running Postgres on Amazon RDS with Engine version 10.6 and am scratching my head as to why the following commands are not ...
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2answers
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Clustered Sequential GUID Primary Key vs Non-Clustered GUID and Clustered Sequential ID Primary Keys

I'm trying to figure out what the optimal solution is in regards to size and performance when using GUIDs as a primary key. The main reason for wanting GUIDs is that it's more appropriate in our micro-...
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2answers
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Casting an array of texts to an array of UUIDs

How can I cast an array of texts into an array of UUIDs? I need to do a join between two tables: users and projects. The users table has an array field named project_ids containing the project IDs ...
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1answer
5k views

How to fix issue uuid_generate_v1() does not exist in postgresql , actually i have the function under public schema

org.springframework.jdbc.BadSqlGrammarException: PreparedStatementCallback; bad SQL grammar [select * from da.test_get(cast(? as integer),cast(? as text),cast(? as text),cast(? as text),cast(? as text)...
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1answer
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Are there any performance differences with a GUID vs INT clustered indexed column, especially with joins on those columns?

Basically what the title says: What are the differences in performance (if any) between using a clustered index on a GUID column vs a clustered index on an INT column, especially when those columns ...
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1answer
437 views

Primary key and index column for Merge replication- Id vs GUID

I currently am revising the tables structure for a few geographically distributed databases- all tables currently have a UUID that is set as primary key. Merge subscription is currently (and in the ...
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1answer
13k views

In Postgres, how to select by a column of type UUID [closed]

I have a DB table that someone else created, its PK is a single column of type 'uuid'. I'm struggling to perform a simple select by that column. Examples I have tried with no success: select from ...
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1answer
2k views

In Postgres 10, how do the choice of SERIAL or UUID type as primary key affect replication, if at all?

A popular answer on SO states that using UUIDs as primary keys has the following benefit: Makes replication trivial (as opposed to int's, which makes it REALLY hard) I have been unable to find ...
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Convert SID string to varbinary(85)

My ssrs server was moved to a different domain because of which the Users table need to be updated with new SID current sid: S-1-5-21-39949945-591092532-1226208319-1007 I want to convert this sid ...
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1answer
11k views

PostgreSQL two different ways to generate a UUID: gen_random_uuid vs uuid_generate_v4?

What is the difference between the following two functions gen_random_uuid() provided by pgcrypto extension uuid_generate_v4() provided by uuid-ossp extension Are they both the same behind the ...
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1answer
176 views

Difference between UUID UUID + Id

what is the difference between these 2 solutions: UUID as primary key VS auto-increment ID as primary key + new UUID field
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1answer
2k views

mariadb Unknown system variable 'server_uuid'

Im trying to setup replication between mariadb(10.1.31-MariaDB - MASTER) and mysql(5.7.12-log - SLAVE). After executed the start slave, I got the below error. Fatal error: The slave I/O thread ...
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3answers
623 views

Index or View of all UUIDs in Postgres DB?

I have a Postgres database with about 35 tables of varying sizes. Every table has an auto incrementing integer primary key, as well as a column of native Postgres uuid data type recording Version 4 ...
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Can IDENTITY COLUMNS generate UUIDs?

I'm just wondering if either the spec of the implementation (PostgreSQL) provides for generating identity columns from UUIds or the like. Is there an alternative to, CREATE TABLE f ( id uuid ...
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4answers
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What can go wrong using the same sequence across multiple tables in postgres?

We are considering using a shared sequence to assign ids to primary keys for all of the tables in our database. There are about 100 of them. Only a couple are inserted to frequently and regularly. We ...
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2answers
432 views

UUID/GUID field and shards

I am planning on using UUID field for storing items which can have a parent item. I am using PostgreSQL 9.5. I imagine there will be 3-4 levels at most. The design is to hold a structure such as ...
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1answer
882 views

I need to generate a GUID,help [closed]

I need help with an SSIS package, I need to generate a GUID code every time I register a row of data, can someone explain how it is done? In the SISS package, the data is extracted from an excel file,...
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1answer
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PostgreSQL custom operator UUID to varchar

I have a rather complicated Postgres database in which many UUID fields were incorrect stored as VARCHAR. I'd like to migrate them over in piecemeal, but unfortunately, doing so breaks all my views as ...
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Which SQL Power Architect type to specify for [PostgreSQL] UUIDs/GUIDs in new column property template/UI?

I have inherited maintaining and extending SQL Power Architect projects in source control which are used to generate the DDL for project DB schemas. We are currently using PostgreSQL 9.5 and SQL Power ...
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1answer
2k views

`uuid_generate_v1mc` in Postgres “uuid-ossp” module: What is random multicast MAC address?

The uuid-ossp module extension (plugin) for Postgres offers this alternative method for generating a UUID value. uuid_generate_v1mc() This function generates a version 1 UUID but uses a random ...
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3answers
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Does Postgres offer a feature like “NEWSEQUENTIALID” in MS SQL Server to make UUID as primary key more efficient

Microsoft SQL Server offers the NEWID command to generate a new GUID (the Microsoft version of UUID) value that can be used as a primary key value (in their uniqueidentifier data type). These are not ...
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1answer
1k views

May postgresql's uuid_generate_v1() conflict when we change the computer date/time?

According to postgresql uuid-ossp documentation uuid_generate_v1() is based on Mac address + timestamp: https://www.postgresql.org/docs/9.4/static/uuid-ossp.html On a distributed database scenario ...
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1answer
418 views

MySQL column that auto generates data, longer than UUID

My friend has the problem as shown below. He asked at StackOverFlow and there is no reply yet till now so I wish to help him to try the luck here. Thanks for everyone that helps. "I would like to ask ...
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1answer
3k views

GUID vs Auto Increment Insert performance

I'm testing the performance of inserts between Auto increment integers vs GUIDs (v4) in tables with a lot of data. Following this blog post, i was expecting seeing a difference. But right now with ...