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1 .. _mysql:
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2
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3
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4 MySQL/MariaDB plugins
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5 =====================
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6
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7 .. contents::
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8
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9 The Orthanc project provides two **official** plugins to replace the
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10 default storage area (on the filesystem) and the default SQLite index
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11 by a MySQL or a MariaDB database.
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12
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13 For general information, check out the `official homepage of the
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14 plugins <http://www.orthanc-server.com/static.php?page=mysql>`__.
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15
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16
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17
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18 Compilation
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19 -----------
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20
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21 Static linking
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22 ^^^^^^^^^^^^^^
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23
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24 .. highlight:: text
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25
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26 The procedure to compile these plugins is similar to that for the
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27 :ref:`core of Orthanc <compiling>`. The following commands should work
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28 for most UNIX-like distribution (including GNU/Linux)::
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29
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30 $ mkdir BuildMySQL
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31 $ cd BuildMySQL
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32 $ cmake ../MySQL/ -DSTATIC_BUILD=ON -DCMAKE_BUILD_TYPE=Release
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33 $ make
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34
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35 The compilation will produce 2 shared libraries, each containing one plugin for Orthanc:
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36
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37 * ``OrthancMySQLIndex`` replaces the default SQLite index of Orthanc by MySQL.
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38 * ``OrthancMySQLStorage`` makes Orthanc store the DICOM files it receives into MySQL.
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39
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40
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41 Microsoft Windows
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42 ^^^^^^^^^^^^^^^^^
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43
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44 Pre-compiled binaries for Microsoft Windows `are also available
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45 <http://www.orthanc-server.com/browse.php?path=/plugin-mysql>`__.
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46
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47
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48 Dynamic linking on Ubuntu 16.04
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49 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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50
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51 .. highlight:: text
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52
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53 If static linking is not desired, here are build instructions for
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54 Ubuntu 16.04 (provided build dependencies for the :ref:`core of
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55 Orthanc <compiling>` have already been installed)::
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56
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57 $ sudo apt-get install libmysqlclient-dev
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58 $ mkdir BuildMySQL
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59 $ cd BuildMySQL
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60 $ cmake ../MySQL/ -DCMAKE_BUILD_TYPE=Release \
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61 -DALLOW_DOWNLOADS=ON \
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62 -DUSE_SYSTEM_GOOGLE_TEST=OFF \
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63 -DUSE_SYSTEM_ORTHANC_SDK=OFF
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64 $ make
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65
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66
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67 Usage
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68 -----
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69
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70 You of course first have to :ref:`install Orthanc <binaries>`, with a
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71 version above 0.9.5. You then have to **create a database** dedicated
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72 to Orthanc on some MySQL/MariaDB server. Please refer to the `MySQL
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73 documentation
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74 <https://dev.mysql.com/doc/refman/8.0/en/database-use.html>`__.
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75
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76 .. highlight:: json
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77
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78 Once Orthanc is installed and the database is created, you must add a
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79 section in the :ref:`configuration file <configuration>` that
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80 specifies the address of the **MySQL/MariaDB server together with your
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81 credentials**. You also have to tell Orthanc in which path it can find
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82 the plugins: This is done by properly modifying the ``Plugins``
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83 option. You could for instance adapt the following configuration
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84 file::
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85
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86 {
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87 "Name" : "MyOrthanc",
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88 "MySQL" : {
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89 "EnableIndex" : true,
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90 "EnableStorage" : true,
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91 "Host" : "localhost", // For Windows or network connections
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92 "Port" : 3306, // For Windows or network connections
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93 "UnixSocket" : "/var/run/mysqld/mysqld.sock", // For UNIX on localhost
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94 "Database" : "orthanc",
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95 "Username" : "orthanc",
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96 "Password" : "orthanc",
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97 "Lock" : true // See section about Locking
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98 },
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99 "Plugins" : [
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100 "/home/user/orthanc-databases/BuildMySQL/libOrthancMySQLIndex.so",
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101 "/home/user/orthanc-databases/BuildMySQL/libOrthancMySQLStorage.so"
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102 ]
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103 }
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104
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105 **Important:** The ``EnableIndex`` and ``EnableStorage`` options must
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106 be explicitly set to ``true``, otherwise Orthanc will continue to use
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107 its default SQLite back-end and the filesystem storage area.
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108
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109 **Remark:** When using the ``Storage`` MySQL plugin, the DICOM files
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110 are stored as blobs in the database. This might actually consume more
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111 space than the DICOM file itself.
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112
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113 Note that a typical usage of the MySQL plugin is to enable only the
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114 ``Index``, using the default filesystem storage for DICOM files.
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115
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116
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117
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118 .. highlight:: text
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119
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120 Orthanc must of course be **restarted** after the modification of its
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121 configuration file. The log will contain an output similar to::
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122
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123 $ ./Orthanc Configuration.json
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124 W0710 14:25:35.143828 main.cpp:1298] Orthanc version: 1.3.2
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125 W0710 14:25:35.146528 OrthancInitialization.cpp:120] Reading the configuration from: "./Configuration.json"
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126 [...]
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127 W0710 14:25:35.173652 main.cpp:671] Loading plugin(s) from: /home/jodogne/Subversion/orthanc-databases/BuildMySQL/libOrthancMySQLIndex.so
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128 W0710 14:25:35.175927 PluginsManager.cpp:269] Registering plugin 'mysql-index' (version mainline)
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129 W0710 14:25:35.176213 PluginsManager.cpp:168] Performance warning: The database index plugin was compiled against an old version of the Orthanc SDK, consider upgrading
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130 W0710 14:25:35.176323 main.cpp:671] Loading plugin(s) from: /home/jodogne/Subversion/orthanc-databases/BuildMySQL/libOrthancMySQLStorage.so
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131 W0710 14:25:35.177172 PluginsManager.cpp:269] Registering plugin 'mysql-storage' (version mainline)
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132 W0710 14:25:35.180684 PluginsManager.cpp:168] Your MySQL server cannot store DICOM files larger than 16MB
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133 W0710 14:25:35.180714 PluginsManager.cpp:168] => Consider increasing "max_allowed_packet" in "my.cnf" if this limit is insufficient for your use
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134 W0710 14:25:35.246150 main.cpp:1098] Using a custom database from plugins
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135 W0710 14:25:35.246210 main.cpp:1109] Using a custom storage area from plugins
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136 [...]
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137 W0710 14:25:37.073633 main.cpp:683] Orthanc has started
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138
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139
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140
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141 Advanced options
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142 ----------------
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143
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144 Several advanced options are available as well to fine-tune the
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145 configuration of the MySQL plugins. They are documented below.
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146
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147
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148 Locking
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149 ^^^^^^^
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150
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151 .. highlight:: json
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152
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153 By default, the plugins lock the database (using `MySQL/MariaDB
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154 "GET_LOCK()"
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155 <https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_get-lock>`__)
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156 to prevent other instances of Orthanc from using the same database. If
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157 you want several instances of Orthanc to share the same database, set
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158 the ``Lock`` option to ``false`` in the configuration file.
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159
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160 Obviously, one must be very cautious when sharing the same database
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161 between instances of Orthanc. In particular, all these instances
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162 should share the same configuration.
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