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System functions (System Control)

SYSTEM$WAIT¶

Waits for the specified amount of time before proceeding.

Syntax¶

SYSTEM$WAIT( amount [ , time_unit ] )
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Arguments¶

Required:

amount

Number specifying the amount of time to wait as determined by time_unit.

Optional:

time_unit

Time unit for amount. Accepted values are DAYS, HOURS, MINUTES, SECONDS, MILLISECONDS, MICROSECONDS, NANOSECONDS. The unit should be in single quotes (see Examples below).

Default: SECONDS

Usage notes¶

  • Most systems do not have clocks that have nanosecond precision. As a result:

    • The actual wait time might not be exactly the same as the specified wait time.

    • The reported wait time might not be exact.

  • SYSTEM$WAIT checks periodically for cancellation. If a user cancels a query while it is waiting, there might be a delay between the time the query is cancelled and the time the cancellation takes effect.

  • If the wait period exceeds the compilation timeout, the query is not cancelled automatically. After the wait, the query resumes normally.

Examples¶

CALL SYSTEM$WAIT(10);

-------------------+
    SYSTEM$WAIT    |
-------------------+
 waited 10 seconds |
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CALL SYSTEM$WAIT(2, 'MINUTES');

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    SYSTEM$WAIT    |
-------------------+
 waited 2 minutes  |
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