Posts - Page 125 (page 125)
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5 min readTo install Hadoop in Kubernetes via Helm chart, first ensure that you have Helm installed in your Kubernetes cluster. Helm is a package manager for Kubernetes that streamlines the installation and management of applications.Next, you need to add the Hadoop Helm repository to Helm. This can be done using the following command: helm repo add bitnami https://charts.bitnami.
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6 min readWorking with large datasets in PostgreSQL requires careful planning and optimization to ensure efficient data handling and querying.
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4 min readIn Oracle, you can concatenate fields using the concatenation operator, which is represented by two vertical bars (||). You simply place the concatenation operator between the fields that you want to concatenate.
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7 min readTo install PySpark without Hadoop, you can do so by installing Apache Spark directly. PySpark is the Python API for Spark, and you can use it without needing to install Hadoop. You can download and install Apache Spark from the official website and then set it up on your system following the installation instructions provided. Once you have Apache Spark installed, you can use PySpark to interact with Spark using Python code.
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7 min readIn Oracle, you can audit user password changes using the "AUDIT CREATE SESSION" command in SQL*Plus. This command will log all password changes made by users with the necessary privileges. Additionally, you can review the audit trail in the database to identify who changed a specific user's password. This information can help you track down the user responsible for the password change.
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7 min readTo decompress a Hadoop Snappy compressed file in Java, you can use the SnappyFramedInputStream class from the Apache Commons Compress library. First, you need to read the compressed file using a FileInputStream and then pass it to the SnappyFramedInputStream to decompress the data. You can then read the decompressed data from the input stream and process it as needed. Remember to close the input streams after you are done using them to free up system resources.
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4 min readIn PostgreSQL, you can split a string using the string_to_array function. This function takes two arguments: the string you want to split and the delimiter you want to use to split the string.For example, if you want to split the string "hello,world" by the comma delimiter, you can use the following query:SELECT string_to_array('hello,world', ',');This will return an array with two elements: "hello" and "world".
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5 min readTo call a stored procedure of Oracle using C#, you can use the OracleCommand class from the Oracle Data Provider for .NET (ODP.NET) library.First, create a connection to the Oracle database using the OracleConnection class and open the connection. Then, create an OracleCommand object and set the CommandType property to StoredProcedure.Next, set the CommandText property to the name of the stored procedure you want to call.
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4 min readTo remove XML attributes in PostgreSQL, you can use the xpath function in combination with the xmlquery function. First, select the XML column from your table and use the xmlquery function to extract the element without the attribute. Then, update the column with the new XML data.
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5 min readTo find specific values in a table in Oracle, you can use a SELECT statement with a WHERE clause. The WHERE clause allows you to specify the conditions that the rows must meet in order to be retrieved.
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2 min readIn PostgreSQL, to return randomly multiple rows from a table, you can use the ORDER BY random() clause in your query. By sorting the rows randomly and limiting the number of rows returned, you can achieve the desired result. Here is an example query:SELECT * FROM your_table ORDER BY random() LIMIT n;Replace your_table with the name of your table and n with the number of rows you want to retrieve. This query will return n randomly selected rows from the table.
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4 min readTo create a user in Oracle 12c, you can use the CREATE USER statement. First, connect to the Oracle Database using SQL*Plus or another SQL client. Then, execute the CREATE USER command followed by the username and password for the new user. You can also assign specific privileges, roles, and quotas to the user during creation. Make sure to have the necessary permissions to create users in the database.