Data Definition Language; defining database structures but not their contents.

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How to generate create table script without primary and foreign key in Oracle

I have lots of schemas and tables. I want to generate create script of all of my tables. I am using below statement and it is working pretty well. SELECT ...
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20 views

Organizing a couple tables in postgresql

I have a data structure that is represented like this: { 'question_id': 1, 'is_required': False, 'question_text': [ { 'id': 1, ...
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1answer
33 views

What's the complexity of renaming a column in MySql?

We want to rename a column in our MySql (version 5.5) database with something like this: ALTER TABLE t1 CHANGE a b INTEGER; Is this an O(N) (N=number of rows in the table) or an O(1) operation? I ...
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1answer
40 views

Does a DDL in Oracle affect other transactions?

I understand that DDL statements in Oracle have an implicit commit before and after the statement, which obviously affects the current transaction. However, does a DDL statement in any way affect ...
2
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1answer
61 views

Has postgresql a fast add column optimization?

When adding not-null columns with a default value - does Postgresql optimizes this operation? In case the table has n rows, a not-optimized alter-table-add-column would yield n writes of the default ...
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1answer
56 views

What objects can be affected in SQL Server 2012 by a DDL statement [closed]

Are they any objects that could be CREATEd, ALTERed, or DROPped in SQL Server 2012 other than the following list: Tables Stored procedures Views Functions Triggers Indexes P.S. I'm only interested ...
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1answer
61 views

Online Schema migration in MySQL : When to start?

I'm the tech lead of a Social Media SAAS, where we're currently experiencing a big increase in data amount we're storing in our mySQL-database. We're having a single MySQL db, and besides many ...
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1answer
23 views

Understanding the output of \d <table> in psql

Say I run the following command: \d mtb.big_table I get the output shown below. My questions are: What are column modifiers? (what does default now() mean?) Under Indexes, Why do some indices ...
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1answer
44 views

How to access external DLL's static methods that incorporate output parameters in SQL Server

I know how to load a CLR DLL in SQL Server and access to its static methods which does not incorporate output parameters in their method signatures but what I cannot realize is how I can use methods ...
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80 views

DDL trigger AFTER ALTER ON SCHEMA behavior

Can anyone please tell me what's going on here: CREATE TRIGGER afr_alt_trig AFTER ALTER ON SCHEMA cols ora_name_list_t; BEGIN IF (ora_dict_obj_type = 'TABLE') THEN select column_name bulk ...
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1answer
30 views

Conditional when creating a domain

How can I define or change a domain based on another attribute value? F.e. domain for salary is a numeric value > 500. But if a date the person was hired > January 1st, 2013, then the salary must be ...
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2answers
66 views

Is this an example of an Enum (Enumerated Type)

I'm looking at a code base that I have inherited. I'm new to Postgres (but have an Oracle background), and I think this in one of the queries is an example of an enum. Can someone confirm if I'm ...
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1answer
228 views

Server Wide DDL Trigger Permissions Issue

I am trying to implement a server wide DDL Trigger that will audit the DDL changes across the databases on the server using script very similar to the article found here The trigger will log the DDL ...
2
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1answer
979 views

Changing a column data type from datetime to float

I have a table with a float column. All values in this column for all records are NULL. I want to change the data type to datetime. I executed the query: ALTER TABLE MyTable ALTER Column MyColumn ...
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4answers
888 views

Open source tools for Oracle schema compares

I'm looking for an open source tool to generate DDL scripts. Many tools call these synchronization scripts. We essentially want to compare schema of different environments (ie: DEV to QA, QA to ...
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1answer
601 views

SQL Server Replication: “ALTER TABLE ALTER COLUMN” is not propagated to subscribers

We are running SQL Server 2008 R2 SP1 as publisher & distributor, and SQL Server 2005 SP3 as subscriber. The replication of schema changes is activated, and the replication has been running for ...
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1answer
412 views

create database table with a owner in my SQL

Can someone tell me what is the SQL command to create a table with specific owner?
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2answers
2k views

Why can't we write ddl statement directly into the PL/SQL block

Why can't we write ddl statements directly in PL/SQL block, for example when i write CREATE OR REPLACE PROCEDURE test IS BEGIN truncate table table_name; // error END test; / But, CREATE OR ...
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1answer
740 views

Why is truncate DDL?

I have an interview question, which being asked during my interview. I answered the question, but interviewer was not convinced with my answer. So, please let me know the what would be the correct ...
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134 views

Replication issue - CREATE SELECT alternative?

I've an MySQL 5.1 slave for our BI team. They need to make some CREATE SELECT with big select queries (several million lines). As CREATE SELECT is a DDL, if the replication attempts to update some ...
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1answer
2k views

How to determine the collation of a table in PostgreSQL?

I want to script a check of the collations used on my tables in PostgreSQL, but googling for Postgresql detect collation is not working well for me, and the documentation is not making this an easy ...
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3answers
608 views

Rollback group of DDL statements

Working in SQL Server 2008 R2, I am trying to rollback a set of DDL statements as a group (think of an upgrade script for a database), but am running into trouble. Take the following code: begin try ...
3
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1answer
2k views

How to create a partitioned table based on date?

I'm trying to create a partitioned table where partitioning is determined by OrderDate. I'm trying to create a clustered index on OrderDate and a nonclustered primary key on OrderID. But I get an ...
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1answer
224 views

Upgrade production database during software development lifecycle

Background Using Oracle, there are a number of tools that help with migrating and applying development changes into the production environment (such as Embarcadero Change Manager). These tools can be ...
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1answer
46 views

Is there a way to create a re-usable base table definition in InfoSphere Data Architect?

Our company has chose to use IBM's InfoSphere Data Architect (IDA) for data architecting regarding our data warehouse and data marts. The data architects originally designed several "re-usable" ...
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2answers
2k views

Column definition for a SQL Server equivalent to Access BOOLEAN type

The BOOLEAN datatype in Access (ie, Jet/ACE) returns a -1 for True and 0 for False; the field is always required (i.e., it cannot be set to NULL). The SQL Server BIT type returns 1 for True and 0 for ...
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163 views

Disallow new UDFs that contain a cursor

Is there a way to prevent developers from creating new user-defined functions that use a cursor? Would a database trigger that can read the code of a UDF do?
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614 views

SQL Server (2012) non-blocking DDL?

I'm not very experienced with SQL Server, so maybe I'm missing something My situation is as follows: Session 1 runs a CREATE TABLE (or other CREATE statements) with autocommit off and the CREATE is ...
2
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1answer
554 views

Default values in SQLite3

When I created the table structure of my SQLite database, I provided a DEFAULT value which is used when no value is provided by the user. Now, because the application code changed, I need to modify ...
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3answers
2k views

What is the purpose of having a table NOT LOGGED INITIALLY

I came across this recently. When defining a table in DB2 LUW (at least 9.5 or higher), you can define it as NOT LOGGED INITIALLY. Example from the book I read: CREATE TABLE products ( productID ...
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2answers
198 views

Can I be notified of a rollback in my DDL Trigger?

I'd like DDL changes in SQL Server to trigger an external process (outside of SQL). The problem is, is there a way for me to be notified via my trigger that a rollback occurred? For instance, with ...
2
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2answers
641 views

What effect does serializable isolation level have on DDL-statements?

I'm using Red Gate SQL Compare to create a release script based on differences between SVN and a database. This results in a script containing a bunch of table- and procedure-changes and it works ...
5
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1answer
441 views

If an 'after' DDL trigger causes an error, is the DDL rolled back?

It has been suggested that DDL is logically performed something like this: begin COMMIT; perform any appropriate pre-DDL trigger code; do the ddl; perform any appropriate post-DDL ...
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2answers
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Script out Oracle DDL in an automated fashion

Oracle SQL Developer is able to export DDL through Tools -> Database Export... This works very well, but requires manual intervention. I know of DBMS_METADATA.get_ddl(), but have found that the ...
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4answers
679 views

DDL contention on TempDB

I have a SQL Server 2005 Standard x64 that is experiencing issues with TempDB DDL contention for the past few months. The server will experiencing contention on wait resource 2:1:103 (the wait type ...
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3answers
759 views

Undo DDL statement on View in Oracle

I Want to undo DDL changes on View, how to do that? I have not set utl_file_dir parameter and can't restart the database to set it. So log miner can not be used yes? it needs this parameter... If ...
7
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1answer
2k views

How to use transactions with SQL Server DDL?

I have a login table into which all inserts are done by a single stored procedure. CREATE TABLE dbo.LogTable( LogRefnr int IDENTITY(1, 1) NOT NULL, LogQuery varchar(255) NOT NULL, LogTime ...
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1answer
2k views

Add DEFAULT to existing column

In Microsoft SQL server, how can I add/change the default on an existing table column using T-SQL?
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1answer
9k views

How can I import the contents of an Oracle database into Visio to create an Entity Relationship Diagram?

I have an Oracle database, and I would like to create an ERD in Visio 2007 Pro. I have so far looked at DBMS_METADATA.GET_DDL commands to generate ddl. I know that I can import an Access DB into ...
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4answers
1k views

Why won't some DBMS's allow rollback for certain DDL statements?

Recently I found out that MySQL doesn't support rollback of DDL such as "alter table"... Being used to PostgreSQL, that struck me as odd, but a friend of mine told me that even Oracle doesn't allow ...