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<code class="php">//check file extension and size $resume= ($_FILES['resume']['name']); $reference= ($_FILES['reference']['name']); $ext = strrchr($resume, "."); $ext1 = strrchr($reference, "."); if (!(($_FILES["resume"]["type"] == "application/doc") || ($_FILES["resume"]["type"] == "application/docx") || ($_FILES["resume"]["type"] == "application/pdf" )) && (($_FILES["reference"]["type"] == "application/doc") || ($_FILES["reference"]["type"] == "application/docx") || ($_FILES["reference"]["type"] == "application/pdf")) && (($ext == ".pdf") || ($ext == ".doc") || ($ext == ".docx")) && (($ext1 == ".pdf") || ($ext1 == ".doc") || ($ext1 == ".docx")) && ($_FILES["resume"]["size"] < 400000) //accept upto 500 kb && ($_FILES["reference"]["size"] < 400000)) { //stop user } else { // allow files to upload }</code>
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<code class="php">function allowed_file(){ //Allowed mime-type files $allowed = array('application/doc', 'application/pdf', 'another/type'); //Validate uploaded file type if(in_array($_FILES['resume']['type'], $allowed) AND in_array($_FILES['reference']['type'], $allowed)){ //Check file size if($_FILES["resume"]["size"] < 400000 AND $_FILES["reference"]["size"] < 400000 ){ //File types and size are accepted, proceed with file processing } } }</code>
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Relationshipsbetweentables.TheyPretorPhanEdrecords, andCancascadeCangeAutomically. BotheThustusEtheInnodbstorageEngine ? foreignKeyColumnsMatchThatteTeTeTeTeTeFeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTeTePle

MySQLDump? MySQL ??????? ??? ??? ???? ???? ?????. ??????? ???? ?? ?? ? ?? ?? ???? SQL ??? ?????. 1. ?? ??? ????? ??? ?????? ??? ???? ??? SQL ???? ?????. 2. ??? ?????? ?? ??? ??? ???? TB ?? ???? ?? ???? ???? ????. 3. ???? ???-single transaction,-databases,-all-databases,-routines ?; 4. MySQL ??? ???? ?? ?? ?? ?? ?? ? ??? ?? ??? ???? ? ????. 5. ??? ????? ????? ?? ? ?? ??? ???? ?? ????.

MySQL ??? ?? ??? ?? ?? ??? ?? ??? ??????. 1. ?? ?? ?? ?? ???? Slow_Query_Log ? Long_Query_Time; 2. ???? ??? ?? ??? ???? ? ????? query_time, lock_time, rows_examined? ?? ?? ??? ???? ????. 3. ??? ????? ???? ?? mysqldumpslow ?? pt-query idigest ??? ??????. 4. ??? ???? ??? ??, ??*???*, ??? ?? ?? ?? ?????. ?? ??, user_id? ???? ???? ?? ? ?? ?? ?? ??? ?? ???? ???? ? ????.

MySQL?? NULL ?? ?? ? ? 1. ???? ?? ? ? ? ??? NotNull? ???? ?? ??? NULL? ?????. 2. iSnull ?? ISNOTNULL = ??! =; 3. Ifnull ?? Coalesce ??? ????? ???? ???? ? ??? ? ????. 4. ?? ?? ????? NULL ?? ?? ??? ?? ???? ??? ?? ? ORM ??? ?? ?? ?????? ??????. NULL? ???? ?? ?? ???? ??? ???? ?? ?? ?? ????. ??? ???? ??, ?? ? ???? ?? ? ??? ?? ??? ??? ?? ???????. ??? ??? ???? ??? ?? ?? ??? ????? ?? ? ????.

MySQL? ?? ????? ?????? ?? ??? ?????. 1. MySQL ?? ??, sudosystemctlstopmysql ?? sudosystemctlstopmysqld? ??????. 2. -skip-grant-tables ???? mysql? ???? sudomysqld-skip-grant-tables &; 3. MySQL? ????? ?? SQL ??? ???? FlushPrivileges; Alteruser'Root '@'localHost'IndifiedBy'Your_new? ?? ??? ?? ????? ??????.

MySQL ?????? ? ???? ??? ??? information_schema? ?? ????? ?? ? ??? ??? ? ????. 1. ?? ?????? ?? ?? : SQL ?? ???? selecttable_schemaas'database ', sum (data_length index_length)/1024/1024as'size (mb) 'frominformation_schema.tablessgroupbytable_schema; ?? ??????? ? ??? ??? ?? ??????? ???? ??? ?? ? ? ????. 2. ?? ??? ??? ?????? : selectta? ??????

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