[taler-grid5k] 113/189: some doc about explain.py

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marco-boss pushed a commit to branch master
in repository grid5k.

commit d396602a0f55063e943733914dda9cb2c0cc81e3
Author: Boss Marco <bossm8@bfh.ch>
AuthorDate: Fri Mar 25 13:37:58 2022 +0100

    some doc about explain.py
---
 additional/README.md                     | 13 +++++++++++++
 additional/explain-visualizer/.gitignore |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/additional/README.md b/additional/README.md
index aa2c423..8507277 100644
--- a/additional/README.md
+++ b/additional/README.md
@@ -33,6 +33,19 @@ Basically the steps are the following (inside plots 
directory):
   in the archive which is created once the plots are finished.
   Default is `TO`.
 
+## explain-visualizer
+
+A python script which is able to execute and and summarize an SQL query against
+an exchange database. It is able to execute statements provided as argument 
but also
+directly from postgres logs. In order for the logs be recognizable the 
following must
+be configured in `postgresql.conf`:
+
+* `log_statement=all`
+* `log_error_verbosity=default`
+* `syslog_split_messages=off`
+
+Make sure that syslog is capable to receive bigger messages (e.g. 
`$MaxMessageSize` in rsyslog).
+
 ## grafana
 
 ### Custom
diff --git a/additional/explain-visualizer/.gitignore 
b/additional/explain-visualizer/.gitignore
new file mode 100644
index 0000000..7ece9bc
--- /dev/null
+++ b/additional/explain-visualizer/.gitignore
@@ -0,0 +1,3 @@
+!*.py
+!*.gitignore
+*

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