eth-janishutz/eth-summaries
1
0
Fork 0
mirror of https://github.com/janishutz/eth-summaries.git synced 2026-09-10 19:15:25 +02:00
Code Issues Packages Projects Releases Wiki Activity

[DMDB] Learnings from practice exams, plus some more tips and tricks

Browse Source
This commit is contained in:
janishutz
2026-08-05 15:23:45 +02:00
parent 07a88db72e
commit fd6cede3c0
8 changed files with 63 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files
semester4/dmdb/parts/04_query-processing/04_join/01_nested-loops.tex
+2
View File
@@ -15,3 +15,5 @@
The cost here is \cost{$P_R + P_R \cdot P_S$ I/Os}, where $P_X$ is the number of pages in the relation $X$.
Furthermore, the DBMS should put the smaller relation on the outer loop to improve performance.
For multiple joins, we want to start with the smallest table (on the inside) and move up to larger ones, processing the largest one \textit{last} (such that it is the outer loop)