Example: Index Analysis With CHECKPOINT
Assume that the query capture database named MyQCD exists on the system. The workload named MyWorkload in MyQCD consists of 100 SQL requests. The following SQL request causes the index analysis information to be saved after every 10 SQL requests because of its CHECKPOINT clause specification:
INITIATE INDEX ANALYSIS ON tab1 FOR MyWorkload IN MyQCD AS table_1Index CHECKPOINT 10;
Suppose a database restart occurs while processing the 55th SQL request. The system then records the information pertaining to the first 50 SQL requests processed.
The following SQL request causes the analysis to be done from the 51st SQL request.
RESTART INDEX ANALYSIS FROM MyWorkload IN MyQCD AS table1_Index;
Example: Index Analysis Without CHECKPOINT
Again assume that the query capture database MyQCD exists on the system and that the workload named MyWorkload consists of 100 SQL requests.
The following SQL request does not specify a checkpoint, so no incremental information is written to the AnalysisLog table in MyQCD.
INITIATE INDEX ANALYSIS ON tab1 FOR MyWorkload IN MyQCD AS table_1Index;
Suppose once again that a database restart occurs while processing the 55th SQL request.
The following SQL request returns an error because there is no row in AnalysisLog that checkpoints the specified index analysis name, table_1Index.
RESTART INDEX ANALYSIS FROM MyWorkload IN MyQCD AS table_1Index; *** Failure 5669 No restart information found for specified index analysis ‘table_1Index'.