SQL Function used to alter an existing table object.

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35 views

Cannot add a column to an InnoDB table in Mariadb

I have this InnoDB table with less than 10 rows in mysql 5.5.40-MariaDB on Linux (x86_64). +-----------------+--------------+------+-----+-------------------+----------------+ | Field | ...
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2answers
25 views

Unable to find how a table is being populated

Using SSMS2014 w/ SQL Server 2008 R2. I have a table that I am trying to find out how and from where data inside it is coming from. (I didn't create the table and am unable to contact the person who ...
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1answer
9 views

Alter doesn't show in processlist

I'm performing an alter. It's currently running on a large table (300,000,000). MariaDB [my_database]> ALTER TABLE my_table -> add INDEX a (x, y, z), -> add INDEX d (x); Stage: 1 of ...
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2answers
55 views

T-SQL — Why do ALTER and UPDATE statement only run when separated into their own batch?

I have update and alter statements that are only running when they are put into they're own batch. Below is my shortened version. It'd probably be a good idea to skip the code and read my question ...
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1answer
49 views

Dropping multiple KEYS of a table

Dropping multiple KEYS in a table is a preferred option or one by one is preferred? “DROP KEY A,DROP KEY B,DROP KEY C" For more 900 million records in the table. How does it work internally?
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1answer
150 views

Alter table and update in sql server transactions

I'm trying to do an alter table to add a new column on a table, then I would like to do some update on the existing rows in the table to add a value to the recently new added column and finally do a ...
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1answer
48 views

How can one drop all default values and allow NULL for all columns of a table?

I'm working on a PHP script to modify the primary key (PK) of a table. My current code is: $q = "SHOW KEYS FROM $db.$table WHERE Key_name='PRIMARY';"; $keys = Query ( $q); if ( $keys) { $q = ...
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2answers
275 views

Update statement is giving an invalid column name error, even though the column exists

I have a temporary table created at the beginning of this stored procedure. It is created successfully and can be selected from and inserted to. Here is the create statement CREATE TABLE ...
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2answers
54 views

Cannot ALTER TABLE

I have a particular table that I cannot add a key for: mysql> ALTER TABLE tasks ADD KEY `fruitful_user_count` (`user_id`, `is_fruitful`); ERROR 1034 (HY000): Incorrect key file for table 'tasks'; ...
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0answers
25 views

Prevent truncate without denying ALTER permission

Is there a way to disallow users from truncating a table without denying ALTER permission on the table? Users should be able to maintain the standard ALTER permissions (adding columns to a table, ...
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42 views

How alter on infobright (BRIGHTHOUSE storage engine) actually works

I have been using infobright-3.4.1 (5.1.40) for data warehousing. I know it is outdated version but there no plan to upgrade the version currently. Even though infobright is build on mysql, the way it ...
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54 views

Add ENum Attribute to existing table using Alter

I am using oracle XE and trying to add a attribute that restricts to only three available value 'Small','Medium','large' to an existing table using Alter Table and Enum. Tried doing, ALTER TABLE ...
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50 views

How to avoid 2013 error when executing ALTER TABLE

I have a huge table (2.8 GB) and I need to add a column. After I run this query I experience a lost connection error (Error code: 2013. Lost connection to MySQL server during query): ALTER TABLE ...
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0answers
38 views

How to diagnose MariaDB crash when changing InnoDB column to AUTO_INCREMENT?

I have this table, and I'm trying to change the first column to AUTO_INCREMENT: +------------+---------------------+------+-----+---------+-------+ | Field | Type | Null | Key | ...
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1answer
57 views

postgresql replace table without losing dependancies

i want to replace an existing table with a new one, without losing foreign keys or inheritance relations. But I feel lazy to alter it to make it look like the new one. Is there a way to replace the ...
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0answers
34 views

How to combine a default value with a new value?

I need to start the value of a column with CON, so when I insert a new value, it needs to "combine" both default and new value; for example: In the CONTACTO_ASP2_TAB table, the column NOMBRE has to ...
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1answer
38 views

Fastest way to alter column type in a 2-billion+ records innodb table

I have a MySQL table with 4 columns. The 1st column record_id is of type int, primary key, and auto-incremented. Now that I have added more than 2 billion records to this table I am finding that I ...
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33 views

pt-online-schema-change with circular replication

So I have an alter table (adding 4 columns) to do on a fairly large table (74 million rows). The problem is this table has firstly to remain online and writable during the whole operation and ...
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1answer
68 views

Adding nullable column to table costs more than 10 minutes

I have problems to add a new column on a table. I tried to run it a couple of times, but after more than 10 minutes running, I decided to cancel the query because of lock time. ALTER TABLE mytable ...
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48 views

PostgreSQL: How can I identify the connections which is blocking ALTER TABLE?

I would like to add some fields to a table in all testing and production DBs, all of which are stored in PostgreSQL 9.3 on Amazon RDS. ALTER TABLE users DROP COLUMN IF EXISTS device_language; ALTER ...
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2answers
43 views

How to delete a column named grave accent in MySQL

As title. Every time when i try to execute the query: ALTER TABLE tablename DROP COLUMN ```, got syntax error, which is understandable. So, what should i do to delete this column whose name is the ...
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1answer
71 views

Does changing the collation of a column change TIMESTAMP (rowversion) values?

I need to run ALTER TABLE ... ALTER COLUMN ... COLLATE Czech_CI_AS ... for multiple columns in a database. All those tables have TIMESTAMP column which is used for database synchronization. Will ...
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1answer
47 views

Apparantly errorneous Exceeds 8K row length message

In attempting to alter an SQL Server table adding DATE and FLOAT columns. I get a message: Warning: The table "CustomerTransactions" has been created, but its maximum row size exceeds the allowed ...
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1answer
61 views

Altering a table to add a New Column vs Create table with New Column

I have Table A which i'm tasked to add a new column is_fully_complete bit(1), and i'm thinking: Would it be better to a.) Create a new table Table_A_new like Table_A and add the new column there ...
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451 views

Changing data type from mediumint to int without downtime

My current table is using MEDIUMINT for ID column ‘primary key auto increment’. The current table records soon will reach the maximum value for mediumint which is 8388607. That being the case, I need ...
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139 views

SQL Server : ALTER TABLE tablename SWITCH PARTITION 2 to tempempty

Have a sliding partition where I need to remove the trailing partition when they expire. I create an empty table that matches the existing table. When I create the empty table, I specify the file ...
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1answer
469 views

Auto_increment value needs to be set as S1

Hi I need to set auto increment for a table as S1. I tried by altering the table and also by creating by new table I am aware how to set auto_increment but when i try to set auto increment as S1 i am ...
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3answers
921 views

Adding non-nullable NEWSEQUENTIALID() column to existing table

In SQL Server 2008, I am adding a non-nullable column to an existing table, and want to make the default NEWSEQUENTIALID(). ALTER TABLE MyTable ADD MyColumn UNIQUEIDENTIFIER NULL CONSTRAINT ...
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1answer
116 views

Why does adding a column to a MySQL table take incredibly long?

I am using MySQL version 5.6 and I have a database that is in total around 110 GB in size. One of the tables, "outputs" is 49 GB in size. I tried to add a simple BOOL column to the outputs table with ...
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2answers
82 views

Alter auto-increment of table with 16 million rows

Learned this the hard way. Need to alter a table's auto-increment with 16 million rows. Now, it's taking quite sometime. Any estimate how long it would take? Sorry.
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1answer
357 views

How to add a column in table via stored procedure? [closed]

create or replace procedure SP_PARAMETER_TEST -- this is my table ( NAME_KEY in VARCHAR2 -- this contains a value assume NAME_KEY contains "Gypsum" ) is begin ALTER TABLE PARAMETER_TEST ADD ...
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1answer
153 views

MySQLSyntaxErrorException on ALTER TABLE … CONVERT TO … in MySQL Connector/J

Running Ubuntu 14.04 with mysql-connector-java-5.1.28 installed. Let's create a table: CREATE TABLE mytable (value1 VARCHAR(32000), value2 TEXT, value3 VARCHAR(1000), value4 VARCHAR(32000)) ...
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1answer
39 views

Should I add it as an additional column or a seperate table?

I have a table in my SQL Server that's called "Regions", it has information about 9 regions and the 10th row holds the info about our Division. Now that we will be merging another 2 divisions with its ...
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1answer
59 views

How does the alter command work internally when adding a column?

Can anyone explain what the internal operations are that takes place when an alter command is issued? How is column modified? Does it use created_tmp_tables or created_tmp_files? As per my test, I ...
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1answer
116 views

MySQL 'copying to tmp table' while enlarging VARCHAR

One user called today because he has tried to enlarge a VARCHAR column (from 20 to 100) in a slightly large table resulting in a write-locked table. I watched PROCESSLIST and saw that ALTER TABLE ...
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1answer
188 views

Add NOT NULL constraint to large table without table scan

Trying to add a NOT NULL constraint to a table with 1 billion rows. I cannot afford a table lock for more than a couple of seconds. Is there a way to prevent a full table scan during the alter table ...
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votes
3answers
1k views

Change column type from varchar to text in all tables at once

I am using Postgres. I would like to change column type in all tables where column name is "description" from varchar(255) to text. If anyone knows that I would be very glad for your help.
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2k views

Moving a table to a different tablespace in Oracle using Online Redefinition Vs Alter table move tablespace

I have a table with 1 Billion records with size 300GB to move to different tablespace. My question here is - What is the advantage of using DBMS_REDEFINITION (Online redefinition) package over Alter ...
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2answers
277 views

Altering Multiple Tables

I have database with 170+ tables in mssql 2012. Some of them contain the field "UserID", varchar(9) while others do not. Due to an application redesign, I need to alter all tables in the database to ...
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1answer
197 views

Best way to add a new column to a large table? (MySQL - MyISAM)

Here's more info on the table that needs to be altered: 15GB size MyISAM table with Index around 5GB Over 100 million rows MySQL 5.1 on RHEL 5 with 4GB RAM Currently live online What's the best ...
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2answers
78 views

Table size reduce with help changing collation charset [MySQL]

I have table which is big enough, phpmyadmin shows that it takes more than 40Gb space. I can't remove data from it, but I've figure out one thing: there is one field which is described as ...
3
votes
1answer
299 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 ...
1
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1answer
619 views

PostgreSQL - how to rename CamelCase column?

When I tried to rename a CamelCase column like this: ALTER TABLE mytable RENAME COLUMN camelCaseColumn TO camel_case_column; I get the following error: ERROR: column "camelcasecolumn" does not ...
2
votes
1answer
81 views

How safe is it to widen a column in MySQL?

Apologies for the simple question but SQL isn't really my forte, and I want to be sure I don't shoot myself in the foot. A MySQL database I volunteered to help maintain has a table that looks like ...
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votes
1answer
1k views

When changing the size of a nvarchar column, do I need to drop the unique index? And will the table get locked when recreating the index?

In our database a big table exists that more or less looks like this: CREATE TABLE dbo.production_data ( pd_id BIGINT PRIMARY KEY, serial NVARCHAR(16) NOT NULL UNIQUE, ... ); but now ...
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163 views

Is it possible to auto generate ALTER scripts for differences between existing DB and updated schema?

I built a internal web application for a client that manages applications to programmes for their employees. The system is Classic ASP on a set of clustered and load balanced Windows 2000 Servers ...
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4answers
115 views

Amount of data in a database table

I am trying to run an alter query on a table, and its giving me a Lost connection to MySQL server during query MySQL server has gone away. The query that I am running is alter table table_name ...
0
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1answer
167 views

Should I use begin tran to do an alter table column that increases the column length?

I want to execute this statement in a production database to alter the length of a varchar column from 50 to 72: ALTER TABLE Users ALTER COLUMN LoginID varchar(72) NOT NULL The column is not null ...
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1answer
274 views

Mysql HY000 the table table_name is full when adding new column

I can't add a new column innodb table which size's 16MB. when I try to add, mysql says HY000 the table table_name is full. I changed my tmp_table_size and heap_size but mysql still says same error. ...
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2answers
2k views

How long will it takes to rename table

How long will it takes to rename table with a size of 219 GB? This is the specification of our server: Memory: 65 GB Available disk space: 266 GB mysql Ver 14.12 Distrib 5.0.77 Sorry for the ...