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improve ARM text about cache DB statistics

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This commit is contained in:
Evan Hunt
2019-08-09 14:36:43 -07:00
committed by Matthijs Mekking
parent 98b460e604
commit 2ceb4b6a98
1 changed files with 23 additions and 9 deletions
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32
doc/arm/Bv9ARM-book.xml
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@@ -15227,15 +15227,29 @@ HOST-127.EXAMPLE. MX 0 .
</entry> </entry>
<entry colname="2"> <entry colname="2">
<para> <para>
The number of RRsets per RR type and nonexistent Statistics counters related to cache contents;
names stored in the cache database. maintained per view.
If the exclamation mark (!) is printed for a RR </para>
type, it means that particular type of RRset is <para>
known to be nonexistent (this is also known as The "NXDOMAIN" counter is the number of names
"NXRRSET"). If a hash mark (#) is present then that have been cached as nonexistent.
the RRset is stale. If a tilde mark (~) is Counters named for RR types indicate the
present, the RRset is marked for garbage number of active RRsets for each type in the cache
collection. Maintained per view. database.
</para>
<para>
If an RR type name is preceded by an exclamation
mark (!), it represents the number of records in the
cache which indicate that the type does not exist
for a particular name (this is also known as "NXRRSET").
If an RR type name is preceded by a hash mark (#), it
represents the number of RRsets for this type that are
present in the cache but whose TTLs have expired; these
RRsets may only be used if stale answers are enabled.
If an RR type name is preceded by a tilde (~), it
represents the number of RRsets for this type that are
present in the cache database but are marked for garbage
collection; these RRsets cannot be used.
</para> </para>
</entry> </entry>
</row> </row>