Documentation Home
MySQL 5.7 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 37.5Mb
PDF (A4) - 37.5Mb
PDF (RPM) - 37.0Mb
EPUB - 10.5Mb
HTML Download (TGZ) - 10.3Mb
HTML Download (Zip) - 10.3Mb
HTML Download (RPM) - 9.0Mb
Eclipse Doc Plugin (TGZ) - 11.2Mb
Eclipse Doc Plugin (Zip) - 13.4Mb
Man Pages (TGZ) - 203.9Kb
Man Pages (Zip) - 309.2Kb
Info (Gzip) - 3.4Mb
Info (Zip) - 3.4Mb
Excerpts from this Manual

B.5.5 Optimizer-Related Issues

MySQL uses a cost-based optimizer to determine the best way to resolve a query. In many cases, MySQL can calculate the best possible query plan, but sometimes MySQL does not have enough information about the data at hand and has to make educated guesses about the data.

For the cases when MySQL does not do the "right" thing, tools that you have available to help MySQL are:


User Comments
Sign Up Login You must be logged in to post a comment.