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******************************* * logQL Version 1.5 * ******************************* April 2011 1. Introduction 2. Dependencies/system requirements 3. Starting logQL 4. Quick Start 5. Memory 6. Known Limitations 1. INTRODUCTION ---------------------- logQL is a data analysis software which allows you to run SQL like queries directly on files without any database. logQL supports the following file types: (a) CSV files. (b) Delimited record format. Where the fields are separated by a standard character, such as '|' or '\t' (c) Custom formats. Can have multiple types of delimiters per row but the same format is present on all rows. For instance HTTP access logs. 2. DEPENDENCIES ---------------------- logQL has the following dependencies: Java(JRE) 1.6 or higher. You can download java depending on the operating systems from: (a) Windows: http://www.java.com/en/download/manual.jsp (b) Mac: http://developer.apple.com/java/ (c) Linux: http://www.java.com/en/download/manual.jsp (d) SolarisL http://www.java.com/en/download/manual.jsp (e) FreeBSD http://www.freebsd.org/java/ (f) AIX http://www.ibm.com/developerworks/java/jdk/aix/service.html (g) HP UX http://www.hp.com/products1/unix/java/ 3. RUNNING logQL ---------------------- (a) For UI: logQL comes with an executable jar double click "logQL.jar" If it does not work, you can run the command java -jar logQL.jar From a terminal window/command prompt. (b) For interactive CLI: From a terminal window/command prompt, run the command: java -jar logQL.jar -c (c) For CLI: To execute a single query from CLI, run the command java -jar logQL.jar -o <outputFormat HTML|CSV> -f <outputFile> <query> 4. MEMORY ---------------------- logQL has a small memory footprint. However, if the query results are very large, you may want to allocate more memory using -Xmx option: java -Xmx256m -jar logQL.jar 5. KNOWN LIMITATIONS ---------------------- (a) Line Feed '\n' is always the row delimiter. This cannot be changed. There are cases where a csv file can have LF within quotes, logQL does NOT support this. (b) Joins are not supported. (c) WHERE clause does not allow comparison of two fields. A field can only be compared to a value or set of values.
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