:package: MSSQL Statistics Parser :package:

A utility library for parsing MSSQL statistics/IO output into a structured response. It was developed for integration into CI/CD tooling to track performance of SQL changes over time.

Documentation

Documentation is using jsDoc and is available as html or markdown version.

To build the documentation in development, you need to run

$ npm run docs

Usage

The API surface area of this library is intentionally small, the parser has one function called parseStatistics that accepts a statistics blob and returns a formatted result.

const { parser } = require('@robbiedhickey/mssql-stats-parser')

let statsText = someFunctionThatReturnsStatistics()
let statsSummary = parser.parseStatistics(statsText)
console.log(statsSummary)

This will output a StatsSummary object with the following information. It includes rolled up summary aggregations of the stats/IO data as well as the details to identify the biggest offenders.

StatsSummary {
  executionTotal: StatsTimeInfo { cpu: 173734, elapsed: 323069 },
  compileTotal: StatsTimeInfo { cpu: 124, elapsed: 127 },
  rowsAffected: 0,
  ioDetails: [
    StatsIOInfo {
      table: 'PostTypes',
      nostats: false,
      scan: 1,
      logical: 2,
      physical: 1,
      readahead: 0,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 0
    },
    StatsIOInfo {
      table: 'Users',
      nostats: false,
      scan: 5,
      logical: 42015,
      physical: 1,
      readahead: 41306,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 0.23
    },
    StatsIOInfo {
      table: 'Comments',
      nostats: false,
      scan: 5,
      logical: 1089402,
      physical: 248,
      readahead: 1108174,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 5.95
    },
    StatsIOInfo {
      table: 'PostTags',
      nostats: false,
      scan: 5,
      logical: 77500,
      physical: 348,
      readahead: 82219,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 0.42
    },
    StatsIOInfo {
      table: 'Posts',
      nostats: false,
      scan: 5,
      logical: 397944,
      physical: 9338,
      readahead: 402977,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 2.17
    },
    StatsIOInfo {
      table: 'Worktable',
      nostats: false,
      scan: 999172,
      logical: 16247024,
      physical: 0,
      readahead: 0,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 88.73
    },
    StatsIOInfo {
      table: 'Worktable',
      nostats: false,
      scan: 0,
      logical: 0,
      physical: 0,
      readahead: 0,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 0
    },
    StatsIOInfo {
      table: 'Worktable',
      nostats: false,
      scan: 0,
      logical: 0,
      physical: 0,
      readahead: 0,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 0
    },
    StatsIOInfo {
      table: 'Votes',
      nostats: false,
      scan: 1,
      logical: 250128,
      physical: 10,
      readahead: 250104,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 1.37
    },
    StatsIOInfo {
      table: 'Posts',
      nostats: false,
      scan: 1,
      logical: 165586,
      physical: 18,
      readahead: 49191,
      loblogical: 823463,
      lobphysical: 42854,
      lobreadahead: 3272,
      percentread: 0.9
    },
    StatsIOInfo {
      table: 'Users',
      nostats: false,
      scan: 1,
      logical: 41405,
      physical: 3,
      readahead: 41401,
      loblogical: 0,
      lobphysical: 0,
      lobreadahead: 0,
      percentread: 0.23
    }
  ],
  ioSummary: StatsIOInfoTotal {
    scan: 999196,
    logical: 18311006,
    physical: 9967,
    readahead: 1975372,
    loblogical: 823463,
    lobphysical: 42854,
    lobreadahead: 3272
  }
}

License

MIT, see license file

Prior Art

This library is based on the excellent work by Jorriss on the Statistics Parser website. The original code can be found here.

The npm package structure is based on the work of jankapunkt and his npm package template repository.