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<languages/>
<languages/>
{{TNT|Database layout}}
{{Database layout}}
{{TOC Right}}
{{TOCright}}
⚫
{{MW 1.3|and after}}
⚫
<translate>
<translate><!--T:10--> The <tvar name=1>'''objectcache'''</tvar> table is the default backend for the Main Stash service, and is also used by a small number of high-impact cache operations as fallback when no other cache backend is configured (e.g. <tvar name=2>{{ll|Memcached}}</tvar>).</translate>
<!--T:1-->
⚫
<translate><!--T:2--> Its content can be safely deleted and excluded from backups as it will be regenerated when needed.</translate>
The '''objectcache''' table is used for a few generic cache operations if not using <tvar|memcached>{{ll|Memcached}}</>.</translate>
<translate>
<!--T:2-->
⚫
Its content can be deleted and excluded from backups as it will be regenerated when needed.


<translate><!--T:11--> See {{<tvar name=1>ll|Manual:Object cache</tvar>|Object cache}} for how this cache is used and how it can be configured.</translate>

⚫
<translate>
==Fields== <!--T:3-->
==Fields== <!--T:3-->
</translate>
</translate>


===keyname===
===keyname===
⚫
<translate><!--T:4--> Unique identifier of the cached object. e.g. <instance>:user:id:<userid></translate>
<translate>
<!--T:4-->
⚫
Unique identifier of the cached object. e.g. <instance>:user:id:<userid>
</translate>


===value===
===value===
<translate>
<translate><!--T:5--> Cached object.</translate>
<!--T:5-->
Cached object.
</translate>


===exptime===
===exptime===
⚫
<translate><!--T:6--> Date (timestamp) the cache entry should be expired and removed.</translate>

===modtoken===
⚫
{{MW 1.37|+}}
?

===flags===
⚫
{{MW 1.37|+}}
?

<translate>
<translate>
<!--T:6-->
==Schema summary== <!--T:9-->
⚫
Date the cache entry should be expired, and therefore removed.

==Versions== <!--T:7-->
</translate>
</translate>

{{TNT|MW version|version=1.19|version2=1.20}}{{-}}
{{MW 1.37|+|gerrit change=666780}}
{{describe table}}
⚫
<pre>
⚫
+----------+------------------+------+-----+-------------------+-------+
⚫
| Field | Type | Null | Key | Default | Extra |
⚫
+----------+------------------+------+-----+-------------------+-------+
⚫
| keyname | varbinary(255) | NO | PRI | | |
⚫
| value | mediumblob | YES | | NULL | |
⚫
| exptime | binary(14) | NO | MUL | NULL | |
⚫
| modtoken | varbinary(17) | NO | | 00000000000000000 | |
⚫
| flags | int(10) unsigned | YES | | NULL | |
⚫
+----------+------------------+------+-----+-------------------+-------+
⚫
</pre>

{{MW 1.36|gerrit change=636049}}
{{describe table}}
<pre>
<pre>
+---------+----------------+------+-----+---------+-------+
+---------+----------------+------+-----+---------+-------+
Line 38: Line 55:
| keyname | varbinary(255) | NO | PRI | | |
| keyname | varbinary(255) | NO | PRI | | |
| value | mediumblob | YES | | NULL | |
| value | mediumblob | YES | | NULL | |
| exptime | datetime | YES | MUL | NULL | |
| exptime | binary(14) | NO | MUL | NULL | |
+---------+----------------+------+-----+---------+-------+
+---------+----------------+------+-----+---------+-------+
</pre>
</pre>


{{MW 1.18}}{{-}}
{{MW version|version=1.10|version2=1.35}}
'''describe objectcache;'''
{{describe table}}
<pre>
<pre>
+---------+----------------+------+-----+---------+-------+
+---------+----------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
| Field | Type | Null | Key | Default | Extra |
+---------+----------------+------+-----+---------+-------+
+---------+----------------+------+-----+---------+-------+
| keyname | varbinary(255) | | PRI | | |
| keyname | varbinary(255) | NO | PRI | | |
| value | mediumblob | YES | | NULL | |
| value | mediumblob | YES | | NULL | |
| exptime | datetime | YES | MUL | NULL | |
| exptime | datetime | YES | MUL | NULL | |
Line 54: Line 71:
</pre>
</pre>


{{MW 1.8}}
{{MW version|version=1.3|version2=1.9}}
{{describe table}}
<translate>
<!--T:8-->
<tt>DESCRIBE objectcache;</tt> in MediaWiki 1.8 gives the following:
</translate>
⚫
<pre>
+---------+------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+------------+------+-----+---------+-------+
⚫
| keyname | char(255) | NO | PRI | NULL | |
⚫
| value | mediumblob | YES | | NULL | |
| exptime | datetime | YES | MUL | NULL | |
+---------+------------+------+-----+---------+-------+
⚫
</pre>

⚫
{{MW 1.9}}
<pre>
+---------+------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+------------+------+-----+---------+-------+
| keyname | char(255) | NO | PRI | NULL | |
| value | mediumblob | YES | | NULL | |
| exptime | datetime | YES | MUL | NULL | |
+---------+------------+------+-----+---------+-------+
</pre>

⚫
{{MW 1.11}}
<pre>
⚫
+---------+-----------------+------+-----+---------+-------+
⚫
| Field | Type | Null | Key | Default | Extra |
⚫
+---------+-----------------+------+-----+---------+-------+
⚫
| keyname | varbinary(255) | NO | PRI | NULL | |
⚫
| value | mediumblob | YES | | NULL | |
⚫
| exptime | datetime | YES | MUL | NULL | |
⚫
+---------+-----------------+------+-----+---------+-------+
</pre>

⚫
{{MW 1.12}}
<pre>
<pre>
+---------+------------+------+-----+---------+-------+
+---------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
| Field | Type | Null | Key | Default | Extra |
+---------+------------+------+-----+---------+-------+
+---------+------------------+------+-----+---------+-------+
| keyname | char(255) | NO | PRI | NULL | |
| keyname | char(255) binary | NO | PRI | NULL | |
| value | mediumblob | YES | | NULL | |
| value | mediumblob | YES | | NULL | |
| exptime | datetime | YES | MUL | NULL | |
| exptime | datetime | YES | MUL | NULL | |
+---------+------------+------+-----+---------+-------+
+---------+------------------+------+-----+---------+-------+
</pre>
</pre>


{{TNT|databases}}
{{databases}}


[[Category:MediaWiki database tables{{translation}}|Objectcache table]]
[[Category:MediaWiki database tables{{#translation:}}|Objectcache table]]

Latest revision as of 16:20, 22 September 2025

Languages:
↑ Manual:Contents
MediaWiki database layout
objectcache table
MediaWiki version:
≥ 1.3

The objectcache table is the default backend for the Main Stash service, and is also used by a small number of high-impact cache operations as fallback when no other cache backend is configured (e.g. Memcached ). Its content can be safely deleted and excluded from backups as it will be regenerated when needed.

See Object cache for how this cache is used and how it can be configured.

Fields

[edit | edit source]

keyname

[edit | edit source]

Unique identifier of the cached object. e.g. <instance>:user:id:<userid>

value

[edit | edit source]

Cached object.

exptime

[edit | edit source]

Date (timestamp) the cache entry should be expired and removed.

modtoken

[edit | edit source]
MediaWiki version:
≥ 1.37

?

flags

[edit | edit source]
MediaWiki version:
≥ 1.37

?

Schema summary

[edit | edit source]
MediaWiki version:
≥ 1.37
Gerrit change 666780

DESCRIBE objectcache; 

+----------+------------------+------+-----+-------------------+-------+
| Field    | Type             | Null | Key | Default           | Extra |
+----------+------------------+------+-----+-------------------+-------+
| keyname  | varbinary(255)   | NO   | PRI |                   |       |
| value    | mediumblob       | YES  |     | NULL              |       |
| exptime  | binary(14)       | NO   | MUL | NULL              |       |
| modtoken | varbinary(17)    | NO   |     | 00000000000000000 |       |
| flags    | int(10) unsigned | YES  |     | NULL              |       |
+----------+------------------+------+-----+-------------------+-------+
MediaWiki version:
1.36
Gerrit change 636049

DESCRIBE objectcache; 

+---------+----------------+------+-----+---------+-------+
| Field   | Type           | Null | Key | Default | Extra |
+---------+----------------+------+-----+---------+-------+
| keyname | varbinary(255) | NO   | PRI |         |       |
| value   | mediumblob     | YES  |     | NULL    |       |
| exptime | binary(14)     | NO   | MUL | NULL    |       |
+---------+----------------+------+-----+---------+-------+
MediaWiki versions:
1.10 – 1.35

DESCRIBE objectcache; 

+---------+----------------+------+-----+---------+-------+
| Field   | Type           | Null | Key | Default | Extra |
+---------+----------------+------+-----+---------+-------+
| keyname | varbinary(255) | NO   | PRI |         |       |
| value   | mediumblob     | YES  |     | NULL    |       |
| exptime | datetime       | YES  | MUL | NULL    |       |
+---------+----------------+------+-----+---------+-------+
MediaWiki versions:
1.3 – 1.9

DESCRIBE objectcache; 

+---------+------------------+------+-----+---------+-------+
| Field   | Type             | Null | Key | Default | Extra |
+---------+------------------+------+-----+---------+-------+
| keyname | char(255) binary | NO   | PRI | NULL    |       |
| value   | mediumblob       | YES  |     | NULL    |       |
| exptime | datetime         | YES  | MUL | NULL    |       |
+---------+------------------+------+-----+---------+-------+
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