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Displaying posts with tag: alter (reset)
Fun with Bugs #45 - On Some Bugs Fixed in MySQL 5.7.15

Oracle released MySQL 5.7.15 recently, earlier than expected. The reason for this "unexpected" release is not clear to me, but it could happen because of a couple of security related internal bug reports that got fixed:

  • "It was possible to write log files ending with .ini or .cnf that later could be parsed as option files. The general query log and slow query log can no longer be written to a file ending with .ini or .cnf. (Bug #24388753)
  • Privilege escalation was possible by exploiting the way REPAIR TABLE used temporary files. (Bug #24388746)"

Let me concentrate on the most important fixes to bugs and problems reported by Community users. …

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Fun with Bugs #43 - Bugs Fixed in MySQL 5.7.13

For some reason I do not see numerous public announcements about recent MySQL 5.7.13 release, even though it happened a couple of days ago formally. Maybe that's because we do not have any really "big" new features in this release (new ->> operator for introduced though for those who, unlike me, care about JSON). Still there are many fixes for bugs previously reported by Community (or Oracle engineers, but still in public bugs database), and I'd like to discuss some of them.

Let me start with the bug that was NOT fixed though, Bug #81093, "mysqld_multi not included in mysql-community-server package", reported by Georgi Iovchev and …

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Log Buffer #429: A Carnival of the Vanities for DBAs

This Log Buffer Edition gathers a wide sample of blogs and then purifies the best ones from Oracle, SQL Server and MySQL.


  • If you take a look at the “alter user” command in the old 9i documentation, you’ll see this: DEFAULT ROLE Clause.
  • There’s been an interesting recent discussion on the OTN Database forum regarding “Index blank blocks after a large update that was rolled back.”
  • 12c Parallel Execution New Features: 1 SLAVE distribution
  • Index Tree Dumps in Oracle 12c …
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The Dangers in Changing Default Character Sets on Tables

The ALTER TABLE statement syntax is explained in the manual at:

To put it simply, there are two ways you can alter the table to use a new character set.


This will alter the table to use the new character set as the default, but as a safety mechanism, it will only change the table definition for the default character set. That is, existing character fields will have the old character set per column. For example:

mysql> create table mybig5 (id int not null auto_increment primary key,      
    -> subject varchar(100) ) engine=innodb default charset big5;
Query OK, 0 rows affected (0.81 sec)

mysql> show create table …

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Implications of Metadata Locking Changes in MySQL 5.5

While most of the talk recently has mostly been around the new changes in MySQL 5.6 (and that is understandable), I have had lately some very interesting cases to deal with, with respect to the Metadata Locking related changes that were introduced in MySQL 5.5.3. It appears that the implications of Metadata Locking have not been covered well, and since there are still a large number of MySQL 5.0 and 5.1 installations that would upgrade or are in the process of upgrading to MySQL 5.5, I thought it necessary to discuss what these implications exactly are.

The post Implications of Metadata Locking Changes in MySQL 5.5 appeared first on ovais.tariq.

Online ALTER TABLE in MySQL 5.6

This is the low-level view of data dictionary language (DDL) operations in the InnoDB storage engine in MySQL 5.6. John Russell gave a more high-level view in his blog post April 2012 Labs Release – Online DDL Improvements. MySQL before the InnoDB Plugin

Traditionally, the MySQL storage engine interface has taken a minimalistic approach to data definition language. The only natively supported operations were CREATE TABLE, DROP TABLE and RENAME TABLE. Consider the following example:

INSERT INTO t VALUES (1),(2),(3);

The CREATE INDEX statement would be executed roughly as follows:

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TaskFreak! v0.6.2 – Customizing Status

Background Knowledge

The progress of a task in TaskFreak! is shown as a percentage value and is not exactly visually appealing to quickly spot the progress. With a few minor alterations we can show the percentage completed bar that fills as the task progresses and a gradient bar indicating the progress along with the percentage value.

This solution was posted by Searcher at Re: Taskfreak Customizing Status.


  1. Edit at line #268 as shown below.
    Cod Before

    <th width="<?php echo FRK_STATUS_LEVELS * 2; ?>%" onclick="freak_sort('statusKey')" colspan="< ?php echo FRK_STATUS_LEVELS ?>" class="sortable">< ?php echo (FRK_STATUS_LEVELS == 1)?'X':$langForm['status']; …
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TaskFreak! v0.6.2 – Alter Search Plugin

Background Knowledge

The Search Plugin for TaskFreak! created by DaDaemon and xdu v0.0.1 (March 26, 2007) was designed to create a simple, quick search capability of the tasks title and description. As well it only searched through he current task view (tasks visible at the time) and tasks that are not completed. For some this was not what was desired and would rather have the Search Plugin search through all tasks weather completed or not and as well search through the comments of tasks along with the title and description. I’ll show you how this is done using Searcher, bchristie and davidlmansfield instructions posted on the TaskFreak! Forums.

Solution – Add the Ability to Search All Tasks

Edit the “index.php” located in …

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When the ALTER TABLE privilege is not enough to run ALTER TABLE

I recently granted ALTER access in MySQL so a user could run the ALTER TABLE command . However after I granted the necessary privileges, the user was still not able to perform the tasks needed. Reproducing the issue using a test instance, I granted a test user the required privileges and MySQL reported no errors or warnings when the ALTER TABLE was run:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.1.41-log MySQL Community Server (GPL)

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> grant alter,create,insert on *.* to 'test'@localhost;
Query OK, 0 rows affected (0.00 sec)

mysql> show warnings;
Empty set (0.00 sec)

mysql> show errors;
Empty set (0.00 sec)


The reason I granted the addition CREATE and INSERT privileges is that according to the MySQL documentation ( …

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TaskFreak! v0.6.2 - Tweaking Priority Menu

Background Knowledge

For some reason or another the priority menu in the edit task panel is not wide enough and therefore it cuts off the priority names. This can be easily fixed by modifying some inline CSS. Yes I agree this should be done within the skin’s CSS file, however there is nothing present in the CSS file to alter that I could find.


Edit /taskfreak/include/html/xajax_panel_edit.php at line #18 by changing the width value of “40px” to “125px” or to what you desired width.

Code Before

<td>< ?php
$objTemp = new ItemPriority();

Code After

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