diff options
| author | Lorry <lorry@roadtrain.codethink.co.uk> | 2012-07-20 20:00:05 +0100 |
|---|---|---|
| committer | Lorry <lorry@roadtrain.codethink.co.uk> | 2012-07-20 20:00:05 +0100 |
| commit | 3ef782d3745ea8f25a3151561a3cfb882190210e (patch) | |
| tree | 86b9c2f5fde051dd0bced99b3fc9f5a3ba08db69 /docs/programmer_reference/program_cache.html | |
| download | berkeleydb-3ef782d3745ea8f25a3151561a3cfb882190210e.tar.gz | |
Tarball conversion
Diffstat (limited to 'docs/programmer_reference/program_cache.html')
| -rw-r--r-- | docs/programmer_reference/program_cache.html | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/docs/programmer_reference/program_cache.html b/docs/programmer_reference/program_cache.html new file mode 100644 index 00000000..5bfbaf9e --- /dev/null +++ b/docs/programmer_reference/program_cache.html @@ -0,0 +1,75 @@ +<?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>Disk drive caches</title> + <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> + <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> + <link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" /> + <link rel="up" href="program.html" title="Chapter 15. Programmer Notes" /> + <link rel="prev" href="program_ram.html" title="Memory-only or Flash configurations" /> + <link rel="next" href="program_copy.html" title="Copying or moving databases" /> + </head> + <body> + <div xmlns="" class="navheader"> + <div class="libver"> + <p>Library Version 11.2.5.3</p> + </div> + <table width="100%" summary="Navigation header"> + <tr> + <th colspan="3" align="center">Disk drive caches</th> + </tr> + <tr> + <td width="20%" align="left"><a accesskey="p" href="program_ram.html">Prev</a> </td> + <th width="60%" align="center">Chapter 15. + Programmer Notes + </th> + <td width="20%" align="right"> <a accesskey="n" href="program_copy.html">Next</a></td> + </tr> + </table> + <hr /> + </div> + <div class="sect1" lang="en" xml:lang="en"> + <div class="titlepage"> + <div> + <div> + <h2 class="title" style="clear: both"><a id="program_cache"></a>Disk drive caches</h2> + </div> + </div> + </div> + <p>Many disk drives contain onboard caches. Some of these drives include +battery-backup or other functionality that guarantees that all cached +data will be completely written if the power fails. These drives can +offer substantial performance improvements over drives without caching +support. However, some caching drives rely on capacitors or other +mechanisms that guarantee only that the write of the current sector +will complete. These drives can endanger your database and potentially +cause corruption of your data.</p> + <p>To avoid losing your data, make sure the caching on your disk drives is +properly configured so the drive will never report that data has been written +unless the data is guaranteed to be written in the face of a power failure. +Many times, this means that write-caching on the disk drive must +be disabled.</p> + </div> + <div class="navfooter"> + <hr /> + <table width="100%" summary="Navigation footer"> + <tr> + <td width="40%" align="left"><a accesskey="p" href="program_ram.html">Prev</a> </td> + <td width="20%" align="center"> + <a accesskey="u" href="program.html">Up</a> + </td> + <td width="40%" align="right"> <a accesskey="n" href="program_copy.html">Next</a></td> + </tr> + <tr> + <td width="40%" align="left" valign="top">Memory-only or Flash configurations </td> + <td width="20%" align="center"> + <a accesskey="h" href="index.html">Home</a> + </td> + <td width="40%" align="right" valign="top"> Copying or moving databases</td> + </tr> + </table> + </div> + </body> +</html> |