To create a new database in PostgreSQL, you can use the CREATE DATABASE statement. Here is the basic syntax for this statement: Replace database_name with the name of the database that you want to create. For example, to create a database named my_database, you would use the following statement: This will create a new database …
To promote a replica in PostgreSQL, you need to perform the following steps:
systemctl command like this:sudo systemctl stop postgresql
To set up streaming replication in PostgreSQL, you need to perform the following steps:
postgresql.conf configuration file and set the wal_level parameter to hot_standby. This will enable the master server to keep a sufficient amount of transaction log data (WAL) to allow the standby server to connect and apply the changes.postgresql.conf configuration file and set the hot_standby parameter to on. This will enable the standby server to connect to the master server and start receiving the changes.recovery.conf file on the standby server, add the following lines to specify the connection details for the master server:In PostgreSQL, the WITH clause allows you to define one or more subqueries that can be referenced by name in the main query. This is often called a common table expression (CTE) because it’s essentially a temporary result set that you can reference within your main query.
Here’s an example of how the WITH clause can be used:
PostgreSQL is a database management system, and as such, vacuuming is an important maintenance task to help keep the database running efficiently. Vacuuming helps to clean up dead tuples (rows that have been deleted or obsoleted) and free up space on the database, which can help to improve performance and prevent the database from becoming bloated or fragmented. It’s generally recommended to vacuum a PostgreSQL database regularly to help maintain its health and performance.
PostgreSQL offers several different types of indexes, each of which can be useful in different situations. Here are some of the most common types of indexes in PostgreSQL:
Partitioning in PostgreSQL is a technique for dividing a large table into smaller, more manageable pieces called partitions. Each partition contains a subset of the data in the table, and the data in each partition is organized and stored in a way that is optimized for the specific subset of data it contains.
Overall, partitioning is a useful technique for dividing large tables into smaller, more manageable pieces in PostgreSQL. It can improve the performance and manageability of the table, and can make it easier to work with large datasets in your database.
You often need to know the size of a table in postgres and there is no particularly easy way to get that information directly from the psql client. Fortunately, all of the information is in there and is available through nice simple functions. All you have to do is pull it together and a stock …
Oracle is a great database. It is cutting edge and it has a huge team of developers behind it as well as massive funding.
There are not any areas where it lacks anything major that exists in other comparable databases.
The problem with Oracle is both that it is expensive in the first place, but also that all of the extras are chargeable and also expensive!
Oracle is the database to beat in terms performance and features or at least is positioned that way. More importantly, if you are thinking of migrating from Oracle to Postgres to save money, you need to know that your new database has at least the same features at the one that you are moving from.
High availability is one of the most important concepts and features for a database system. For most enterprise level applications, downtime has a direct financial cost and the actual loss of some or all of your data would be catastrophic.
You need to know that the system that you are moving to can protect your data as well as the system that you are on at the moment.