Tag: INSERT

Feed: Planet PostgreSQL. Postgres has not global variables for PLpgSQL. This week I worked for one customer who had emulation of global variables based on temporary tables.Depends on usage, this implementation can be very slow - more due often using temporary tables, a pg_class, pg_attribute tables can bloat, and these functions are slower and slower. So don't use it. There are alternative, much better solution, based on custom configuration variables:Original code: CREATE OR REPLACE FUNCTION public.setvar(_varname text, _value text) RETURNS void LANGUAGE plpgsql 1 AS $function$ 2 begin 3 create temporary table if not exists variables(varname text unique, value text); ... Read More

Feed: Planet MySQL; Author: MyDBOPS; Introduction             We are well aware that ProxySQL is one of the leading SQL aware proxy for MySQL. In this blog I am going to explain the backup & restore strategies of the ProxySQL . I think, still there is not well structured blog about this topic . If you are looking for other articles on our ProxySQL Series : MySQL replication Read-Write Split up Replication Switchover using Proxysql And MHA HA for proxysql with keepalived Mirroring MySQL Queries Handling Resource expensive Queries Percona Cluster/MariaDB cluster(Galera) Read-Write Split. Amazon Aurora (RDS) ... Read More

Feed: R-bloggers. Author: Pablo Seibelt. A new version of the package redshiftTools has arrived with improvements and it’s now available in CRAN! This package let’s you efficiently upload data into an Amazon Redshift database using the approach recommended by Amazon This package is helpful because otherwise uploading data with inserts in Redshift is super slow, this is the recommended way of doing replaces and upserts per the Redshift documentation, which consists of generating various CSV files, uploading them to an S3 bucket and then calling a copy command on the Redshift server, all of that is handled by the package ... Read More

Feed: Planet MySQL; Author: Shahid shaikh; Facebook Login is widely used as an authentication module on websites. Instead of asking user manual details such as email and password and then verify them, it’s better to use already verified user details. In this article, we are going to learn and implement a Facebook Login System using Nodejs and ExpressJS. You can download the code by clicking the button below. DOWNLOAD Creating Facebook App: Very first thing you going to need is AppID and AppSecret from Facebook App. Please go to Facebook Developers and create your app. Choose Website as platform when it ask. Give the ... Read More

Feed: MariaDB Knowledge Base Article Feed. Author: . MariaDB starting with 10.4.0Beginning in MariaDB 10.4, you can control the ordering of execution on table operations using parentheses. Syntax ( expression ) [ORDER BY [column[, column...]]] [LIMIT {[offset,] row_count | row_count OFFSET offset}] Description Using parentheses in your SQL allows you to control the order of execution for SELECT statements and Table Value Constructor, including UNION, EXCEPT, and INTERSECT operations. MariaDB executes the parenthetical expression before the rest of the statement. You can then use ORDER BY and LIMIT clauses the further organize the result-set. Note: In practice, the Optimizer may ... Read More

Feed: Planet PostgreSQL. This is the 4th and last part in the series Benchmarking Managed PostgreSQLCloud Solutions. At the time of this writing, Microsoft Azure PostgreSQL was at version 10.7, newer than the two contenders: Amazon Aurora PostgreSQL at version 10.6and Google Cloud SQL for PostgreSQL at version 9.6. Microsoft decided to run Azure PostgreSQLon Windows: postgres=> select version(); version ------------------------------------------------------------ PostgreSQL 10.7, compiled by Visual C++ build 1800, 64-bit (1 row) For this particular test that didn’t work out too well, and I will hazard to guess that Microsoft is well aware of the limitations, the reason why under ... Read More

Author: mkysel. Internally, NuoDB uses the two-phase commit protocol to manage durability of user data. NuoDB also supports the X/Open XA protocol for synchronizing global transactions across multiple data stores. XA is also sometimes referred to as two-phase commit. The fundamental principles in both protocols are similar, but serve different purposes. Let us explore the difference between these two protocols.A Single Transaction Across Two Resources Let us explore a simple use case. A simple application takes messages from one data source (outgoing_messages) and writes them to a new data source (incoming_messages). This is a fairly common use case if you ... Read More

Author: . Internally, NuoDB uses the two-phase commit protocol to manage durability of user data. NuoDB also supports the X/Open XA protocol for synchronizing global transactions across multiple data stores. XA is also sometimes referred to as two-phase commit. The fundamental principles in both protocols are similar, but serve different purposes. Let us explore the difference between these two protocols.A Single Transaction Across Two Resources Let us explore a simple use case. A simple application takes messages from one data source (outgoing_messages) and writes them to a new data source (incoming_messages). This is a fairly common use case if you ... Read More

Feed: Planet MySQL; Author: Krunal Lathiya; SQL Left Join Tutorial With Example | Left Outer Join in SQL is today’s topic. The LEFT JOIN keyword returns all records from the left table (table1), and the matched records from the right table (table2). The LEFT JOIN clause allows us to query data from the multiple tables. It returns all the rows from a left table and the matching rows from a right table. This means that the left join returns all the values from a left table, plus matched values from a right table or NULL in the case of no ... Read More

Feed: Databasejournal.com - Feature Database Articles. Author: . Have you deleted a bunch of rows from a table that has an identity column value? Do you now find that when you insert a new row, you find that the identity column value was set to one higher than the highest identity column value that your table original had? This can happen if you make a mistake and inserted a bunch of rows by accident, and then you delete those accidentally insert rows without reseeding your identity value. If you have made this insert mistake or just delete a bunch of ... Read More