Florin Ghita Florin Ghita Surprisingly this command never returns. Initially I thought its problem with Sql Developer. So I tried in sqlplus command line. It behaves same. Any clues please? If the table is Very Big and the number of rows affect is considerable, you shoud wait. Oracle must write data on disks. This don't just happen. A program polling table continuously looking for records to be processed.
I think this program is locking entire table. Which system table stores info if its doing row level locking or table locking? Add a comment. Active Oldest Votes. You have triggers that perform additional work, You're updating a column referenced by a non-indexed foreign key. Improve this answer. Vincent Malgrat Vincent Malgrat Florin Ghita Florin Ghita Surprisingly this command never returns. Initially I thought its problem with Sql Developer.
So I tried in sqlplus command line. It behaves same. Any clues please? If the table is Very Big and the number of rows affect is considerable, you shoud wait. For t3 , ts1 permits NULL but has an explicit default of 0. This is permitted:. Suppose that tables t1 and t2 have these definitions:. For example:. Scanning starts at the beginning of str and fails if format is found not to match. Extra characters at the end of str are ignored.
Unspecified date or time parts have a value of 0, so incompletely specified values in str produce a result with some or all parts set to Range checking on the parts of date values is as described in Section To convert a year-week to a date, you should also specify the weekday:.
The second form enables the use of an integer value for days. In such cases, it is interpreted as the number of days to be subtracted from the date or datetime expression expr. This differs from the behavior for NOW , which returns a constant time that indicates the time at which the statement began to execute. If that is a problem, you can use row-based logging. This works if the option is used on both the source and the replica. TIME expr. Extracts the time part of the time or datetime expression expr and returns it as a string.
This function is unsafe for statement-based replication. With a single argument, this function returns the date or datetime expression expr as a datetime value. With two arguments, it adds the time expression expr2 to the date or datetime expression expr1 and returns the result as a datetime value. One expression may be a date and the other a datetime; a date value is treated as a datetime having the time part '' where necessary.
The unit for the result an integer is given by the unit argument. Other specifiers produce a NULL value or 0. The other hour format specifiers produce the hour value modulo Returns the time argument, converted to seconds. Given a date date , returns a day number the number of days since year 0.
For dates before and possibly a later year in other locales , results from this function are not reliable. Remember that MySQL converts two-digit year values in dates to four-digit form using the rules in Section For example, '' and '' are seen as identical dates:.
In MySQL, the zero date is defined as '' , even though this date is itself considered invalid. Given a date or datetime expr , returns the number of seconds since the year 0. If expr is not a valid date or datetime value, returns NULL. The server interprets date as a value in the session time zone and converts it to an internal Unix timestamp value in UTC. If the argument includes a time part, it may optionally include a fractional seconds part.
The return value is an integer if no argument is given or the argument does not include a fractional seconds part, or DECIMAL if an argument is given that includes a fractional seconds part. Here is an example, using values that are distinct in the MET time zone:. Returns the current UTC time as a value in 'hh:mm:ss' or hhmmss format, depending on whether the function is used in string or numeric context.
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