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Fix max_sescmd_history documentation

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The session commands are now always stored but they are stored as
references. Also clarified that the feature was disabled in older
versions.
This commit is contained in:
Markus Mäkelä
2018-10-15 16:02:38 +03:00
parent 2f76c48b06
commit a2ef874fe6
1 changed files with 6 additions and 5 deletions
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11
Documentation/Routers/ReadWriteSplit.md
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@ -215,17 +215,18 @@ the slave with the least amount of connections
**`max_sescmd_history`** sets a limit on how many distinct session commands each **`max_sescmd_history`** sets a limit on how many distinct session commands each
session can execute before the session command history is disabled. The default session can execute before the session command history is disabled. The default
is 50 session commands. is 50 session commands starting with MaxScale 2.3.0. In older versions, the
session command history was disabled by default.
``` ```
# Set a limit on the session command history # Set a limit on the session command history
max_sescmd_history=1500 max_sescmd_history=1500
``` ```
The first and last execution of each session command is stored. This means that When a session command is executed for the first time, it is stored in
with `N` distinct session commands, the minimum value of `max_sescmd_history` to memory. Any subsequent executions of the same command are stored as references
guarantee that all of them are kept in the history is `N * 2`. In practice, the to the original command. By storing references instead of copies of the data,
real history size required to store the commands is closer to `N`. the amount of memory used is reduced.
If you have long-running sessions which change the session state often, increase If you have long-running sessions which change the session state often, increase
the value of this parameter if server reconnections fail due to disabled session the value of this parameter if server reconnections fail due to disabled session