mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2026-05-14 19:07:15 +02:00
Code Issues Projects Releases Packages Wiki Activity

Minor enhancements on the thread query cache and UNION docs.

Browse source 
Docs/manual.texi:
  Added note on how to determine thread cache efficiency.
  
  Added information on the behavior of the UNION clause
This commit is contained in:
unknown 2002-07-10 22:01:57 -06:00
commit d98e55e823
1 changed files with 7 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

9
Docs/manual.texi
View file

@ -20166,8 +20166,9 @@ is a new thread created. This variable can be increased to improve
performance if you have a lot of new connections. (Normally this doesn't
give a notable performance improvement if you have a good
thread implementation.) By examing the difference between
the @code{Connections} and @code{Threads_created} you can see how efficient
the current thread cache is for you.
the @code{Connections} and @code{Threads_created} status variables
(See @ref{SHOW STATUS} for details) you can see how efficient
thread cache is.
@item @code{thread_concurrency}
On Solaris, @code{mysqld} will call @code{thr_setconcurrency()} with
@ -34044,6 +34045,10 @@ SELECT ...
@code{UNION} is used to combine the result from many @code{SELECT}
statements into one result set.
The columns listed in the select_expression portion of the @code{SELECT} should
have the same type. The column names used in the first @code{SELECT} query will be
used as the column names for the results returned.
The @code{SELECT} commands are normal select commands, but with the following
restrictions: