Blog | Pythian | MySQL (4)

MySQL

Best practice for setting up MySQL replication filters

It is not uncommon that we need to filter out some DBs or Tables while setting up replication. It is important to ...

MySQL

Syncing inconsistent MySQL slaves

Introduction Checksum is a standard practice among DBAs to verify the data consistency across replicated nodes. In this ...

MySQL

Creating a test lab using VirtualBox / NAT networking

My job is almost completely reliant upon my ability to perform work in lab of virtual machines. Almost every action ...

MySQL

Some Fun with MySQL's History List

Why this article? First of all, because I had fun digging in the code. Then, I was reading a lot about the improvements ...

MySQL

Rails and Database Session Variables

Ruby's ActiveRecord provides a very robust means of manipulating database table structures especially in the context of ...

MySQL

SQL Injection with MySQL SLEEP()

Recently we've received an alert from one of our clients that running threads are high on one of their servers. Once we ...

MySQL

ODA Re-imaging Could Take Anywhere Between 20 and 120 Minutes

20 mins vs 2 hours Recently, I have noticed that re-imaging process on the second Oracle Database Appliance node took ...

MySQL

Mystery Solved: Replication lag in InnoDB

Troubleshooting Replication Lag During XtraBackup While running a backup with XtraBackup against a slave server we ...

MySQL

Using Docker to visualize MySQL performance schema

Context Last week, I was pleased to present at Percona Live Amsterdam 2015 regarding the importance of Performance ...

MySQL

Why are your indexes larger than your actual data?

It’s a common but startling sight for any DBA: you look at your database statistics and realize your indexes are ...

MySQL

Benchmarking Google Cloud SQL instances

Google Cloud SQL is a fully managed database service that makes it easy to set-up, maintain, manage, and administer ...

MySQL

Data encryption at rest

This blog post was co-authored by Peter Sylvester and Valerie Parham-Thompson Introduced in version 10.1.3 (and with ...

MySQL

InnoDB error: Total number of locks exceeds the lock table size

Recently, one of our customers had a problem with one of their replication slaves where a sql statement gave an error ...

MySQL

Exporting the mysql.slow_log table into slow query log format

Using pt-query-digest is an excellent way to perform a SQL review. However, sometimes you don't have access to the ...

MySQL

How and why tmp_table_size and max_heap_table_size are bounded.

Overview In some cases, MySQL creates internal temporary tables while processing queries. On the base of the dimensions ...

MySQL

Hard Drive: Inner or Outer?

To be precise, I wonder if OUTERmost tracks of a spinning HDD are faster than INNERmost tracks. Should we put physical ...

MySQL

Hashing Algorithm in MySQL PASSWORD()

Investigating the MySQL PASSWORD() Hashing Algorithm Recently we had a question from a customer: what is the hashing ...

MySQL

In depth: MySQL 5.6+ DDL

Overview DDL (Data Definition Language) statements create, alter, and remove database objects. These types of changes ...

MySQL

Connection timeout parameters in MySQL

Introduction wait_timeout interactive_timeout net_read_timeout net_write_timeout What do these timeouts do in MySQL? If ...

MySQL

Detecting source of MySQL Queries with comments

Background As a MySQL DBA I already know the data changes that happen on my system. I have logs for that. However, it’s ...

MySQL

fsfreeze in Linux

Suspending and Resuming Access A filesystem can be frozen using following command: # /sbin/fsfreeze -f /data Now if you ...

MySQL

Benchmark: TokuDB vs. MariaDB / MySQL InnoDB compression

Introduction As the amount of data companies are interested in collecting grows, life becomes all the more difficult ...

MySQL

How I Find MySQL Fragmentation

Background Sarah Novotny recently posted InnoDB Tablespace Fragmentation – Find it and Fix it, so I thought I would ...

MySQL

Rounding Errors in MYSQL with DECIMAL Type

It seems to be assumed that fixed-point values, DECIMAL and NUMERIC, in MySQL are not susceptible to rounding errors ...

MySQL

Once again about innodb-concurrency-tickets

I had to refresh my knowledge on how InnoDB threads queue works the other day when debugging activity spikes on one of ...

MySQL

Change Views DEFINER Without ALTER VIEW: How to Fix Thousands of Views

Recently I faced an interesting challenge: modify over 26k views on a single mysqld instance. Altering the view one by ...

MySQL

Debugging IN vs OR Performance in MySQL

I was recently puzzled by the question: “Which query will be faster?” SELECT * FROM table WHERE pk = x OR pk = x1 OR pk ...

MySQL

Notes on Learning MySQL (as an Oracle DBA)

I spent some time last month getting up to speed on MySQL. One of the nice perks of working at Pythian is the ability ...

MySQL

MySQL on Debian and Ubuntu

Introduction Debian Linux (the underlying foundation of Ubuntu) manages the startup/shutdown of MySQL quite differently ...

MySQL

How to Run a Streaming Backup with innobackupex

On many of our clients, we have a need to run XtraBackup as a regular OS user. Aside from running into the issue where ...

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Best practice for setting up MySQL replication filters

Syncing inconsistent MySQL slaves

Creating a test lab using VirtualBox / NAT networking

Some Fun with MySQL's History List

Rails and Database Session Variables

SQL Injection with MySQL SLEEP()

ODA Re-imaging Could Take Anywhere Between 20 and 120 Minutes

Mystery Solved: Replication lag in InnoDB

Using Docker to visualize MySQL performance schema

Why are your indexes larger than your actual data?

Benchmarking Google Cloud SQL instances

Data encryption at rest

InnoDB error: Total number of locks exceeds the lock table size

Exporting the mysql.slow_log table into slow query log format

How and why tmp_table_size and max_heap_table_size are bounded.

Hard Drive: Inner or Outer?

Hashing Algorithm in MySQL PASSWORD()

In depth: MySQL 5.6+ DDL

Connection timeout parameters in MySQL

Detecting source of MySQL Queries with comments

fsfreeze in Linux

Benchmark: TokuDB vs. MariaDB / MySQL InnoDB compression

How I Find MySQL Fragmentation

Rounding Errors in MYSQL with DECIMAL Type

Once again about innodb-concurrency-tickets

Change Views DEFINER Without ALTER VIEW: How to Fix Thousands of Views

Debugging IN vs OR Performance in MySQL

Notes on Learning MySQL (as an Oracle DBA)

MySQL on Debian and Ubuntu

How to Run a Streaming Backup with innobackupex

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