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It also shows information about write-ahead logging and checkpoint processing. This information is cluster-wide, and not specific to any one database.\u003c/p\u003e\n\u003cp\u003eThis utility can only be run by the user who initialized the cluster because it requires read access to the data directory. You can specify the data directory on the command line, or use the environment variable \u003ccode class=\"envar\"\u003ePGDATA\u003c/code\u003e. This utility supports the options \u003ccode class=\"option\"\u003e-V\u003c/code\u003e and \u003ccode class=\"option\"\u003e--version\u003c/code\u003e, which print the \u003cspan class=\"application\"\u003epg_controldata\u003c/span\u003e version and exit. 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It also shows information about write-ahead logging and checkpoint processing. This information is cluster-wide, and not specific to any one database.\u003c/p\u003e\n\u003cp\u003eThis utility can only be run by the user who initialized the cluster because it requires read access to the data directory. You can specify the data directory on the command line, or use the environment variable \u003ccode\u003ePGDATA\u003c/code\u003e. This utility supports the options \u003ccode\u003e-V\u003c/code\u003e and \u003ccode\u003e--version\u003c/code\u003e, which print the \u003cspan\u003epg_controldata\u003c/span\u003e version and exit. 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