SQL Function used to alter an existing table object.

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How to recover previous values in Mysql Table?

I have MySQL Innodb table of 14M rows. There was a column called is_disabled which had different values. By mistake I ran the query without the where clause: update url_queue set is_disabled=1 ...
6
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2answers
22k views

Why does simple ALTER TABLE command take so long on table with full-text index?

I have a large (~67 million rows) name-value table that has full-text indexing on the value column (DataValue). My question is: If I try to run the following sql command: ALTER TABLE VisitorData ...
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1answer
161 views

Columns are added in wrong order

I have a encountered strange behaviour adding columns to an existing table. I run those scripts using osql several instances. Let Table a_table have initially three columns A_col, B_col and C_col. ...
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3answers
1k views

Changing a column's data type fills the transaction log

Running this code: ALTER TABLE npidata ALTER COLUMN npi varchar(20) Gives this error: Msg 9002, Level 17, State 4, Line 2 The transaction log for database 'SalesDWH' is full. To find out why ...
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4answers
18k views

MySQL - fastest way to ALTER TABLE for InnoDB

I have an InnoDB table that I want to alter. The table has ~80M rows, and quit a few indices. I want to change the name of one of the columns and add a few more indices. What is the fastest way to ...
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1answer
679 views

Can't run Alter Table command due to locks

I'm unable to drop, delete or alter a database in my Local SQL Server instance. I have run sp_Who2 and there don't appear to be any processes using the database apart from a process which gets ...
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1answer
3k views

Alter table modify column on a huge table containing more than 25 million records

I want to modify a column on a huge table containing more than 25 million records. I am using sybase 12.5.4. I have read through these posts What is the most efficient way to alter a column ...
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1answer
5k views

Can I rename the values in a MySQL ENUM column in one query?

Suppose I have a Database table with an ENUM('value_one','value_two'). I want to change that to an ENUM('First value','Second value'). I an currently doing that as follows: ALTER TABLE `table` MODIFY ...
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5answers
2k views

Modifying table structure within a transaction?

In Oracle (and probably elsewhere), executing an ALTER TABLE statement will do an implicit commit on the current transaction. We have a tool (written in Java) that should modify a schema by: adding ...
4
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3answers
12k views

How to change the datatype of a column from integer to money?

I am attempting to convert a PostgreSQL table column from integer to money, but I am receiving the error: cannot cast type MyColumn to money I have tried these two statements, but just haven't ...
4
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2answers
3k views

Preordering the table by a specified column

I have a table and I am always getting the data by ordering a column. In my case, I order by datenum. However, the selection is so slow because of the ordering. Is it possible to order the table ...
21
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3answers
11k views

Adding columns to production tables

What's the best way to add columns to large production tables on SQL Server 2008 R2? According to Microsoft's books online: The changes specified in ALTER TABLE are implemented immediately. If the ...
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3answers
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ALTER TABLE on a large table with an indexed column

I have a large table with a VARCHAR(20) column, and I need to modify that to become a VARCHAR(50) column. Typically, performing an ALTER TABLE (adding a TINYINT) on this particular table takes about ...
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1answer
1k views

How can I alter the type of a money-column to decimal in PostgreSQL?

I have a table in PostgreSQL where one column "vat" has type money but I would like to alter it to decimal instead. How can I do it? I tried with: alter table my_table alter column vat type decimal;...