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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:46:48 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:46:48 +0000 |
| commit | 311bcfc6b3acdd6fd152798c7f287ddf74fa2a98 (patch) | |
| tree | 0ec307299b1dada3701e42f4ca6eda57d708261e /doc/src/sgml/html/runtime-config-error-handling.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-15-311bcfc6b3acdd6fd152798c7f287ddf74fa2a98.tar.xz postgresql-15-311bcfc6b3acdd6fd152798c7f287ddf74fa2a98.zip | |
Adding upstream version 15.4.upstream/15.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/runtime-config-error-handling.html')
| -rw-r--r-- | doc/src/sgml/html/runtime-config-error-handling.html | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/doc/src/sgml/html/runtime-config-error-handling.html b/doc/src/sgml/html/runtime-config-error-handling.html new file mode 100644 index 0000000..e0c5115 --- /dev/null +++ b/doc/src/sgml/html/runtime-config-error-handling.html @@ -0,0 +1,71 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>20.14. Error Handling</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="runtime-config-compatible.html" title="20.13. Version and Platform Compatibility" /><link rel="next" href="runtime-config-preset.html" title="20.15. Preset Options" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">20.14. Error Handling</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="runtime-config-compatible.html" title="20.13. Version and Platform Compatibility">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="runtime-config.html" title="Chapter 20. Server Configuration">Up</a></td><th width="60%" align="center">Chapter 20. Server Configuration</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="runtime-config-preset.html" title="20.15. Preset Options">Next</a></td></tr></table><hr /></div><div class="sect1" id="RUNTIME-CONFIG-ERROR-HANDLING"><div class="titlepage"><div><div><h2 class="title" style="clear: both">20.14. Error Handling</h2></div></div></div><div class="variablelist"><dl class="variablelist"><dt id="GUC-EXIT-ON-ERROR"><span class="term"><code class="varname">exit_on_error</code> (<code class="type">boolean</code>) + <a id="id-1.6.7.17.2.1.1.3" class="indexterm"></a> + </span></dt><dd><p> + If on, any error will terminate the current session. By default, + this is set to off, so that only FATAL errors will terminate the + session. + </p></dd><dt id="GUC-RESTART-AFTER-CRASH"><span class="term"><code class="varname">restart_after_crash</code> (<code class="type">boolean</code>) + <a id="id-1.6.7.17.2.2.1.3" class="indexterm"></a> + </span></dt><dd><p> + When set to on, which is the default, <span class="productname">PostgreSQL</span> + will automatically reinitialize after a backend crash. Leaving this + value set to on is normally the best way to maximize the availability + of the database. However, in some circumstances, such as when + <span class="productname">PostgreSQL</span> is being invoked by clusterware, it may be + useful to disable the restart so that the clusterware can gain + control and take any actions it deems appropriate. + </p><p> + This parameter can only be set in the <code class="filename">postgresql.conf</code> + file or on the server command line. + </p></dd><dt id="GUC-DATA-SYNC-RETRY"><span class="term"><code class="varname">data_sync_retry</code> (<code class="type">boolean</code>) + <a id="id-1.6.7.17.2.3.1.3" class="indexterm"></a> + </span></dt><dd><p> + When set to off, which is the default, <span class="productname">PostgreSQL</span> + will raise a PANIC-level error on failure to flush modified data files + to the file system. This causes the database server to crash. This + parameter can only be set at server start. + </p><p> + On some operating systems, the status of data in the kernel's page + cache is unknown after a write-back failure. In some cases it might + have been entirely forgotten, making it unsafe to retry; the second + attempt may be reported as successful, when in fact the data has been + lost. In these circumstances, the only way to avoid data loss is to + recover from the WAL after any failure is reported, preferably + after investigating the root cause of the failure and replacing any + faulty hardware. + </p><p> + If set to on, <span class="productname">PostgreSQL</span> will instead + report an error but continue to run so that the data flushing + operation can be retried in a later checkpoint. Only set it to on + after investigating the operating system's treatment of buffered data + in case of write-back failure. + </p></dd><dt id="GUC-RECOVERY-INIT-SYNC-METHOD"><span class="term"><code class="varname">recovery_init_sync_method</code> (<code class="type">enum</code>) + <a id="id-1.6.7.17.2.4.1.3" class="indexterm"></a> + </span></dt><dd><p> + When set to <code class="literal">fsync</code>, which is the default, + <span class="productname">PostgreSQL</span> will recursively open and + synchronize all files in the data directory before crash recovery + begins. The search for files will follow symbolic links for the WAL + directory and each configured tablespace (but not any other symbolic + links). This is intended to make sure that all WAL and data files are + durably stored on disk before replaying changes. This applies whenever + starting a database cluster that did not shut down cleanly, including + copies created with <span class="application">pg_basebackup</span>. + </p><p> + On Linux, <code class="literal">syncfs</code> may be used instead, to ask the + operating system to synchronize the whole file systems that contain the + data directory, the WAL files and each tablespace (but not any other + file systems that may be reachable through symbolic links). This may + be a lot faster than the <code class="literal">fsync</code> setting, because it + doesn't need to open each file one by one. On the other hand, it may + be slower if a file system is shared by other applications that + modify a lot of files, since those files will also be written to disk. + Furthermore, on versions of Linux before 5.8, I/O errors encountered + while writing data to disk may not be reported to + <span class="productname">PostgreSQL</span>, and relevant error messages may + appear only in kernel logs. + </p><p> + This parameter can only be set in the + <code class="filename">postgresql.conf</code> file or on the server command line. + </p></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="runtime-config-compatible.html" title="20.13. Version and Platform Compatibility">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="runtime-config.html" title="Chapter 20. Server Configuration">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="runtime-config-preset.html" title="20.15. Preset Options">Next</a></td></tr><tr><td width="40%" align="left" valign="top">20.13. Version and Platform Compatibility </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 20.15. Preset Options</td></tr></table></div></body></html>
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