Oracle ??????? ??? ?? ?? ??
Oracle ????????? ? ????? ?? ??? ?? ??? ???? ?? ???? ????? ???? ?? ?? ??? ???? ????? ?? ?? ???? ??? ? ????.
???? ??
TIMESTAMP ??? ? ??? ? ? Oracle? INTERVAL DAY TO SECOND ?? ?????. ? ???? ?????? ???(Windows/Unix)? ?? ??? ?? ?????? ?????. EXTRACT ??? ?? ? ??? ?? ??? ?????? ???? ?? ??? ???? ? ??? ?? ??? ? ????.
總毫秒數(shù) = (extract( day from diff ) * 24 * 60 * 60 * 1000) +
(extract( hour from diff ) * 60 * 60 * 1000) +
(extract( minute from diff ) * 60 * 1000) +
(round(extract( second from diff ) * 1000))
???
? ?? ?????? ??? ?????.
- ????? 1: 2023-02-06 12:45:34.123
- ????? 2: 2023-02-05 11:30:15.678
?? ??? ??? ??? ????? ?? ??? ??? ? ????.
SELECT EXTRACT(DAY FROM diff) * 24 * 60 * 60 * 1000 +
EXTRACT(HOUR FROM diff) * 60 * 60 * 1000 +
EXTRACT(MINUTE FROM diff) * 60 * 1000 +
ROUND(EXTRACT(SECOND FROM diff) * 1000) AS total_milliseconds
FROM (SELECT timestamp1 - timestamp2 AS diff FROM dual);
? ??? ? ????? ??? ? ??? ?? ?????. ? ??:
<code>total_milliseconds: 86400000 + 54000000 + 1800000 + 98543</code>
?? ??
???? ? ???? ???? ???? ? ??? Oracle? ?? ??? ???? ? ??? ??? ?? ????. ?? ?? TO_CHAR ??? ???? INTERVAL DAY TO SECOND ?? ???? ??? ??? ???? ??? ? ????. ?? DBMS_OUTPUT ???? PUT_LINE ????? ???? ???? ??? ? ?? ??(?: ?, ?, ?, ?, ???)? ????? ??? ? ??? ???.
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GTID (Global Transaction Identifier)? ? ????? ?? ? ??? ???? MySQL ???????? ?? ? ?? ??? ???? ?????. 1. ?? ??? ????? ?? ?? ? ??? ???? ???? ???? ??? ????? ?? ? GTID? ???? ????? ??? ? ????. 2. ?? ?? ???? ???? ? ????? ? ???? ? ?? ??????? ??? ???? ?????. 3. ?? ?? ???? ??????. GTID?? ?? UUID ? ?? ??? ???? ??? ???? ??? ???? ? ???? ??? ???? ????. ? ? ?? ?? ??? MySQL ????? ???? ???? ???? ??? ???? ??? ???? ?? ??????.
MySQL ??? ?? ??? ???? ????? ??????
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?? ?? ???? MySQL ??????? ???? ??? ??????
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MySQL ??????? ???? ??? ??? ????. 1. ?? ?? ??? ???? MySQL-U ??? ?? -P-H ??? ??? ????? ??? ??? ????? ???? ???????. 2. ??? ??????? ?? ?? ???? ?? MySQL-Uroot-PmyProject? ?? ?? ? ?????? ??? ?? ? ? ????. 3. ??? ?? 3306? ?? ?? MySQL-Uroot-P-H192.168.1.100-P3307? ?? ?? ??? ????? -p ?? ??? ???????. ?? ???? ??? ???? ?? ?? ? ? ????. ??? ???? ????, ??? ?? ?? ??? ??????. ?????? ?? ? ?? ??? ???? ?? Linux? MySQL-Client? ??? ? ????. ? ??? ???????
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MySQL? ???? ?? ??? ???? ?? ???? ?????
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MySQL? ?? ???? ?? ??? ??? ? A??, ?? MVCC ? GAP ?? ??? ?? ??? ?? ? ?? ???? ??? ???? ???? ?? ?? ??? ????. ?? ?? ??? ??? ?? (??)? ????? ??? ??? ????? ?? ?? ??? ????? 1. ??? ??? (read committed)? ?? ? ???? ?? ? ??? ?? ? ??? ?? ? ?? ?? ?? ?? ? ? ????. ???, ??? ??? ????? ??? ??;
MySQL ????? ?? ??? ??????
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MySQL ????? ?? ??? ?? ?????? ????? ???? ???? ?????. ??, ???? ??? ???? ??? ????? ?????. ?? ?? ?? ?? ??? ?????. ?? ??, ?? ? ??? ?? ???? ??? ????? ??? ???? ??????. ??, ???? ????? ??????? ? ??? ???? ?? ??? ?? ? ? ????? ?? ?? ? ???? ?? ????? ?? ??? ??? ??? ?????. ??, ??? ?? ??? ?? ??? ???? ????, ??? ??, ?? ???? ?? ? ??? ??? ?????. MySQL? readuncommitted ? readcommi? ?????.
???? MySQL ?? ??? ????? ??? ??????
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INdexESINMYSQLIMPROVEQUERYPEEDBYENABLEABERDATARETRIVEAL.1. THEYREDUCEDASCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCANCEND, WHERREORORDERBANTROWESINTROWSES, ?? ?? ??? ???? ?????
MySQL Workbench? ?? ??? ??? ??????
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mysqlworkbench? ??? ?? ??? ?? ??? ?????. ?? ??? ?? ??? ?? ????. 1. Windows ???? %appdata %\ mysql \ workbench \ connections.xml? ????. 2. MacOS ???? ~/Library/ApplicationSupport/MySQL/Workbench/Connections.xml? ????. 3. ????? Linux ???? ~/.mysql/workbench/connections.xml ?? ~/.local/share/data/mysql/wor? ????.
