Multi-Master Replication with Slony
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ne of the most sought after features in PostgreSQL is a scalable multi-master replication solution. While there does exists some tools to create multi-master clusters such as Bucardo and pgpool-II, they may not be the right fit for an application. In this session, you will learn some of the strengths and weaknesses of these more popular multi-master solutions for PostgreSQL and how they compare to using Slony for your multi-master needs. We will explore the types of deployments best suited for a Slony deployment and the steps necessary to configure a multi-master solution for PostgreSQL.
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There are 4 types of JDBC drivers. Database connections can be obtained using the DriverManager or a DataSource. Statements are used to execute SQL queries and updates. PreparedStatements are useful for executing the same statement multiple times with different parameter values. Joins allow querying data from multiple tables.
PHP tips by a MYSQL DBA
The document provides various PHP and MySQL tips and best practices including:
1) Signing queries and using comments helps when debugging slow queries and process lists.
2) The "LOAD DATA INFILE" statement is 20 times faster than INSERT for loading data.
3) Normalizing data and avoiding storing multiple values in a single column improves performance.
4) Joins should be used instead of executing multiple queries to compare rows.
Less09 Data
This document provides an overview of managing data and concurrency in Oracle databases. It covers using SQL to manipulate data through INSERT, UPDATE, DELETE, and MERGE commands. It also describes PL/SQL objects like packages, procedures, functions and triggers. Finally, it discusses how to monitor and resolve locking conflicts that can occur from concurrent transactions through detecting and resolving blocking sessions and deadlocks.
Best practices tekx
The document discusses several software development best practices including source control, coding standards, design patterns, documentation, testing, and deployment. It provides examples and explanations of common design patterns like factory, registry, adapter, decorator, and observer. Resources for further information on topics like Subversion, Git, coding standards, and design patterns are also referenced.
Session Server - Maintaing State between several Servers
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OSDC 2009 Rails Turtorial
This document discusses various Rails concepts and tools including MVC, ActiveRecord, templates/helpers, libraries/plugins, deployment, and internationalization. It provides code examples for features like validations, callbacks, counter caches, named scopes, STI, polymorphic associations, pagination, Ajax forms, and exception handling. Various plugins are described like attachment_fu, acts_as_taggable, will_paginate, and facebox_render for adding functionality. Deployment topics covered include mailers, exception tracking, and Capistrano.
Msql
The document provides information on various SQL commands used for data manipulation and control, database objects like tables and schemas, users and privileges in SQL. It discusses commands like COMMIT, ROLLBACK, GRANT, REVOKE used for transactions and managing privileges. It also summarizes creation, alteration and deletion of database objects using commands like CREATE, ALTER, DROP and functions like SELECT, INSERT, UPDATE, DELETE for data manipulation. The document further discusses concepts like stored procedures in SQL and use of phpMyAdmin for administering MySQL databases.
Caching and tuning fun for high scalability @ FrOSCon 2011
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Advance Sql Server Store procedure Presentation
This document discusses stored procedures in SQL, including:
1. What stored procedures are and how they improve performance over dynamic SQL.
2. How to create stored procedures with parameters and return values.
3. How to call/execute stored procedures and examples of inserting, updating, and deleting data using stored procedures.
4. The process of stored procedure compilation and recompilation, including when recompilation may be needed due to changes in data or indexes.
Week6
1. The document discusses transactions in SQL and PHP/PDO. It provides examples of running concurrent transactions that update the same table from two separate terminals.
2. It then covers transaction concepts like atomicity, consistency, isolation, and durability. It demonstrates how to start a transaction, insert and select data, and either commit or roll back the transaction in PHP/PDO.
3. The transaction is stored in the database until it is either committed or rolled back. Stress testing with JMeter is suggested to simulate high user loads on database resources.
Ch ch-changes cake php2
CakePHP 2.0 has been re-factored and rebuilt with many internal and external API changes. It uses native PHP5 features, updated conventions for class and file names, and a new loader. Exceptions replace the old error handling. Collections unify how helpers, components, behaviors and tasks are loaded and used. The console, request/response, sessions, authentication, email, and testing have all been improved for better performance and extensibility. Benchmarks show CakePHP 2.0 has significantly better performance than 1.3.11.
P H P Part I I, By Kian
The document provides instructions on installing PHP, MySQL, and related tools. It then demonstrates connecting to a MySQL database from PHP, performing basic CRUD (create, read, update, delete) operations, and using sessions to share data across multiple pages. Key steps include installing PHP and MySQL, connecting to the database, executing queries, and retrieving and displaying results in HTML. Sessions are demonstrated to share a user's name across three different pages.
Zen and the Art of Claroline Module Development
Or: How I Learned to Stop
Worrying and Love
Creating Claroline
Modules
by Frédéric Minne
Institut de pédagogie universitaire et des
multimédias
UCL - Belgique
Using Geeklog as a Web Application Framework
Slides for the workshop "Using Geeklog as a Web Application Framework", as held at
- LinuxTag 2006, Wiesbaden, Germany, 2006-05-06
- PHP user group meeting, Stuttgart, Germany, 2006-05-10
- FrOSCon, Bonn, Germany, 2006-06-24
Ruby on rails
Migrations allow you to define and manage changes to your database schema over time. The document discusses ActiveRecord migrations, which provide a way to iteratively improve the database schema by adding, removing, and changing tables and columns. It also covers generating and rolling back migrations, common migration methods like create_table and add_column, and using migrations to support models and testing.
pseudo code basics
This document discusses planning tools used in programming, focusing on pseudocode. It defines pseudocode as a way for programmers to develop program logic without worrying about syntax. The document then covers the six basic computer operations that can be represented in pseudocode: (1) receiving input, (2) outputting information, (3) performing arithmetic, (4) assigning values to variables, (5) comparing variables to select actions, and (6) repeating groups of actions. It provides examples and guidelines for writing effective pseudocode using keywords, indentation, and other conventions.
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MySQL Stored Procedures: Building High Performance Web Applications
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The document discusses strategic autovacuum configuration and monitoring in PostgreSQL. It begins by explaining the ACID properties and how MVCC and transactions work. It then discusses how to monitor workloads for heavily updated tables, adjust per-table autovacuum thresholds to prioritize those tables, monitor autovacuum behavior over time using logs and queries, and tune the autovacuum throttle settings based on that monitoring to optimize autovacuum performance. The key steps are to start with defaults, monitor workload changes, adjust settings for busy tables, continue monitoring, and refine settings as needed.
Top 10 Mistakes When Migrating From Oracle to PostgreSQL
As more and more people are moving to PostgreSQL from Oracle, a pattern of mistakes is emerging. They can be caused by the tools being used or just not understanding how PostgreSQL is different than Oracle. In this talk we will discuss the top mistakes people generally make when moving to PostgreSQL from Oracle and what the correct course of action.
Oracle postgre sql-mirgration-top-10-mistakes
The document discusses the top 10 mistakes Oracle DBAs make when migrating to PostgreSQL. These include: configuring PostgreSQL settings based on Oracle without understanding PostgreSQL's different architecture, preserving uppercase metadata which is lowercase in PostgreSQL, unnecessary use of tablespaces, not using PostgreSQL's native features like PL languages and data types, treating exceptions the same between the databases, and not properly handling null values. It emphasizes that PostgreSQL and Oracle have meaningful differences and to avoid porting Oracle concepts directly without understanding PostgreSQL.
Profiling PL/pgSQL
The document discusses using PL/pgSQL functions and stored procedures to implement fantasy football scoring rules and statistics in PostgreSQL. It provides examples of functions to calculate scores for rushing, passing, receiving and touchdowns. It also shows how to use these functions to calculate average yearly scores for players and debug the functions using RAISE notices. The end discusses using the PLProfiler extension to monitor and analyze the performance of PL/pgSQL functions.
Debugging Your PL/pgSQL Code
PL/pgSQL is a very robust development language allowing you to write complex business logic. The downside is as the complexity of your functions grows, how do you debug them? We have all used RAISE statements to print out the progress of our functions, but they can quickly overwhelm your logs becoming useless.
In this talk, we will: - Walk through the setup of 2 key PostgreSQL extensions, the PL/pgSQL Debugger and the PL Profiler - Demonstrate how the PL Profiler can identify problem areas in your functions - Setting breakpoints in functions and triggers - Stepping through PL/pgSQL functions - Discuss the performance impact of running the extensions on production environments
An Introduction To PostgreSQL Triggers
Triggers are those little bits of code running in your database that gets executed when something happens that you care about. Whether you are a developer who puts all of your business logic inside of PL/pgSQL functions or someone who uses an ORM and wants to stay away from database code, you will likely end up using triggers at some point. The fact that the most recommend way of implementing table partitioning in PostgreSQL uses triggers accounts for the importance of understanding triggers.
In this talk, we will step through examples of writing various types of triggers using practical uses cases like partitioning and auditing.
The structure of a trigger
BEFORE vs AFTER triggers
Statement Level vs Row Level triggers
Conditional triggers
Event triggers
Debugging triggers
Performance overhead of triggers
All of the examples will be done using PL/pgSQL so in addition to getting an overview of triggers, you will also get a good understanding of how to code in PL/pgSQL.
PostgreSQL Procedural Languages: Tips, Tricks and Gotchas
One of the most powerful features of PostgreSQL is its diversity of procedural languages, but with that diversity comes a lot of options.
Did you ever wonder:
- What all of those options are on the CREATE FUNCTION statement?
- How do they affect my application?
- Does my choice of procedural language affect the performance of my statements?
- Should I create a single trigger with IF statements or several simple triggers?
- How do I debug my code?
- Can I tell which line in my function is taking all of the time?
Introduction to PostgreSQL
This is a introduction to PostgreSQL that provides a brief overview of PostgreSQL's architecture, features and ecosystem. It was delivered at NYLUG on Nov 24, 2014.
http://www.meetup.com/nylug-meetings/events/180533472/
Postgresql Federation
As more and more alternative data stores come into use, the problem of being able to easily use and report on the data scattered across those data stores becomes increasingly difficult. PostgreSQL has a feature called Foreign Data Wrappers that allows external data sources to be queried from PostgreSQL and look like a standard table. Using Foreign Data Wrappers, users can create a report that joins data residing in Oracle, Hadoop and MongoDB all in a single query.
In this talk, we'll discuss how to set up a Foreign Data Wrapper for various data sources and the pros and cons using them. We'll also discuss the growing ecosystem of Foreign Data Wrapper and a little about how to write one.
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Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
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Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdf
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
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Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
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GraphSummit Singapore | Neo4j Product Vision & Roadmap - Q2 2024
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdf
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GraphSummit Singapore | Graphing Success: Revolutionising Organisational Stru...
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Multi-Master Replication with Slony
- 3. Founder of Cirrus Technologies
- 4. Former Chief Architect of EnterpriseDB
- 11. At the expense of performance
- 13. Need to deal with conflict resolution
- 15. PgPool
- 16. RubyRep
- 18. Limited to 2 masters
- 20. Need to deal with Nondeterministic functions
- 22. Limited to 2 masters
- 26. The stores control the daily sales information
- 28. The tables at the stores are read-only
- 33. Cascading will be necessary with many stores slonik <<_EOF_ cluster name = Store1; node 1 admin conninfo = 'dbname=store1'; node 2 admin conninfo = 'dbname=hq'; init cluster ( id=1, comment = 'Store1 Node'); create set (id=1, origin=1, comment='All Store1 sales tables'); set add table (set id=1, origin=1, id=1, fully qualified name = 'public.sales_store1', comment='sales partition'); set add table (set id=1, origin=1, id=2, fully qualified name = 'public.sales_line_store1', comment='sales detail partition'); store node (id=2, comment = 'HQ node', event node=1); store path (server = 1, client = 2, conninfo='dbname=store1'); store path (server = 2, client = 1, conninfo='dbname=hq'); _EOF_
- 35. Need to deal with the complexity of table inheritance
- 37. All accounts need to be visible
- 38. Changes to international accounts do occur
- 40. Unique account identifier across all regions
- 41. Ping-pong effect
- 43. FROM accounts
- 44. WHERE account_no = X
- 47. SELECT account_id, account_no, account_name,
- 56. Reliance on a central broker
- 58. PostgreSQL is extremely flexible
- 59. Together you can do some strange and powerful things
- 60. Don't use multi-master unless absolutely necessary