diff --git a/db/sql/docs/training.txt b/db/sql/docs/training.txt
index 7b007c0cf..3482467b4 100644
--- a/db/sql/docs/training.txt
+++ b/db/sql/docs/training.txt
@@ -1,2 +1,5 @@
 https://sqltest.online/
 https://sqltest.online/ru/
+https://sqltest.online/ru/books
+
+https://www.sql-ex.ru/
diff --git a/db/sql/postgres/docs/courses/pg-pro.txt b/db/sql/postgres/docs/courses/pg-pro.txt
index bf40b4ba3..8c3ed9a01 100644
--- a/db/sql/postgres/docs/courses/pg-pro.txt
+++ b/db/sql/postgres/docs/courses/pg-pro.txt
@@ -17,6 +17,8 @@ PostgresProfessional - RogovLuzanovTolmachyov - QPT13 - Query Optimization of p1
         !   Nested Loop - node of plan
         ! 12:00 select * from aircrafts a left join seats s on (a.aircraft_code = s.aircraft_code) where a.model like '...';
         !   Nested Loop Left Join - node of plan
+        ! 19:00 nested-loop-join is effective on middle/sized cardinality only (for big ones need index)
+        !   + join can be done on anly condition
     p5 - Bitmap Scan 0:00 of 25:57
         https://www.youtube.com/watch?v=j7e7EANyJhE
     p4 - Inex Scan of 41:10
diff --git a/db/sql/postgres/feature/functions/gen-data.txt b/db/sql/postgres/feature/functions/gen-data.txt
index 491825d84..5ea5856d1 100644
--- a/db/sql/postgres/feature/functions/gen-data.txt
+++ b/db/sql/postgres/feature/functions/gen-data.txt
@@ -1,3 +1,7 @@
 https://www.postgresql.org/docs/current/functions-srf.html
     https://postgrespro.ru/docs/postgrespro/17/functions-srf
 ... from generate_series(1, 1e6) as id;
+
+2025
+https://habr.com/ru/companies/otus/articles/874140/
+    ! generate_series
diff --git a/db/sql/postgres/feature/performance/tools/optimizer/tuned.txt b/db/sql/postgres/feature/performance/tools/optimizer/tuned.txt
new file mode 100644
index 000000000..56732ba87
--- /dev/null
+++ b/db/sql/postgres/feature/performance/tools/optimizer/tuned.txt
@@ -0,0 +1,23 @@
+https://tuned-project.org/
+https://github.com/redhat-performance/tuned
+
+https://github.com/xvitaly/tuned-switcher
+https://github.com/xvitaly/tuned-switcher/tree/master/docs
+https://github.com/xvitaly/tuned-switcher/blob/master/docs/screenshots.md
+
+dnf
+    tuned
+        /usr/lib/systemd/system/tuned.service
+    tuned-profiles-postgresql
+        man ...
+        /usr/lib/tuned/profiles/postgresql/tuned.conf
+    tuned-utils
+        /usr/bin/powertop2tuned
+        /usr/libexec/tuned/pmqos-static.py
+
+2024
+https://habr.com/ru/companies/otus/articles/859270/
+    sudo apt install tuned
+https://www.opennet.ru/opennews/art.shtml?num=62307
+2019
+https://tuned-project.org/docs/tuned_devconf_2019.pdf
diff --git a/pl/cross/methodologies/data-oriented/books.txt b/pl/cross/methodologies/data-oriented/books.txt
new file mode 100644
index 000000000..6002d25b2
--- /dev/null
+++ b/pl/cross/methodologies/data-oriented/books.txt
@@ -0,0 +1,5 @@
+2022
+Sharvit - Data-Oriented Programming
+    https://libgen.gs/edition.php?id=142233369
+    https://libgen.gs/adse0b950a2e99145978b73883e1f520995N400FPUD
+    http://books.ms/main/e0b950a2e99145978b73883e1f520995
diff --git a/pl/java/tools/build/maven/features/snapshots.txt b/pl/java/tools/build/maven/features/snapshots.txt
new file mode 100644
index 000000000..e0901d4ca
--- /dev/null
+++ b/pl/java/tools/build/maven/features/snapshots.txt
@@ -0,0 +1 @@
+https://stackoverflow.com/questions/5901378/what-exactly-is-a-maven-snapshot-and-why-do-we-need-it