If a large number of DDL statements are executed on the partitioned parent table, the processing speed of SE is slow and the latency is high. As a result, data write and read are slow. In this case, you can optimize the frequency of executing DDL statements. Lock query cost: the ...
The EXPLAIN command will fail if you use it for other SQL commands, such as data definition language (DDL) or database operations. The EXPLAIN output relative unit costs are used by Amazon Redshift to choose a query plan. Amazon Redshift compares the sizes of various resource estimates to ...
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3. A user runs a DDL command such as CREATE, DROP, RENAME, or ALTER. 4. The database issues an implicit COMMIT statement before and after every DDL statement. If the current transaction contains DML statements, then Oracle Database first commits the transaction and then runs and commits the...
Benefrancis / system-design-101 Public forked from ByteByteGoHq/system-design-101 Notifications You must be signed in to change notification settings Fork 0 Star 0 Explain complex systems using visuals and simple terms. Help you prepare for system design interviews. ...