today , I have been reviewing the files of the cache

are this files correct?

../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D1209%26amp%3Bcom_id%3D40%26amp%3Bcom_rootid%3Dhttp%3A%2F%2Fwww.aprilzest.com%2Fimage%2Flila.jpg%3F%26cmd%3Dcat%2520bugado^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D1210%26amp%3Bcom_id%3D37%26amp%3Bcom_rootid%3Dhttp%3A%2F%2Fwww.aprilzest.com%2Fimage%2Flila.jpg%3F%26cmd%3Dcat%2520bugado^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D528%26amp%3Bcom_id%3D26%26amp%3Bcom_rootid%3Dhttp%3A%2F%2Fwww.aprilzest.com%2Fimage%2Flila.jpg%3F%26cmd%3Dcat%2520bugado^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D608%26amp%3Bcom_id%3D29%26amp%3Bcom_rootid%3Dhttp%3A%2F%2Fwww.aprilzest.com%2Fimage%2Flila.jpg%3F%26cmd%3Dcat%2520bugado^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D608%26amp%3Bcom_id%3D30%26amp%3Bcom_rootid%3Dhttp%3A%2F%2Fwww.aprilzest.com%2Fimage%2Flila.jpg%3F%26cmd%3Dcat%2520bugado^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D1209%26amp%3Bcom_id%3D40%26amp%3Bcom_rootid%3D40%26amp%3B^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D1209%26com_id%3D40%26com_rootid%3D40%26^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D1210%26com_id%3D37%26com_rootid%3D37%26^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D528%26com_id%3D26%26com_rootid%3D26%26^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D603%26com_id%3D23%26com_rootid%3D23%26^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D608%26com_id%3D29%26com_rootid%3D29%26^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Fevent_id%3D608%26com_id%3D30%26com_rootid%3D30%26^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html

I run the FCH - Hack

I observe that the format of the URL is different !!
../cache/piCal^%2Fv2%2Fmodules%2FpiCal%2Findex.php%3Faction%3DView%26event_id%3D0000001208^default-mp00^%%C7^C7C^C7C6C522%%db%3Apical_event_detail.html

is tried hacked my site?

just in case, I have erased these archives ...

Don't worry about them.
They are just module caches.

Anyway, you should turn the module cache off in system admin -> preferences -> general.

FCH works well in almost cases.
XOOPS's modules cache works bad in almost cases.

the last month my supplier of hosting gave a warning me of a high consumption of resources the MySql...

then I activate the cache of xoops.... and solved problem

if I use only FCH-hack I avoid the overload of the MySql?

Quote:
FCH can reduce the number of queries in your site.
It will be enough.

Anyway, XOOPS module cache should be disabled.
It does not check any privileges of the modules.