DB13 warnings

Hi,

I'm getting following DB13 warnings :

BR0970W Database administration alert - level: ERROR, type: MISSING_STATISTICS, object: (table) SAPR3.ZJT01

BR0970W Database administration alert - level: ERROR, type: MISSING_STATISTICS, object: (table) SAPR3.ZJT01_TXT

BR0970W Database administration alert - level: ERROR, type: MISSING_STATISTICS, object: (table) SAPR3.ZWHMIST

BR0970W Database administration alert - level: ERROR, type: MISSING_STATISTICS, object: (index) SAPR3.ZJT01~0

BR0970W Database administration alert - level: ERROR, type: MISSING_STATISTICS, object: (index) SAPR3.ZJT01_TXT~0

BR0970W Database administration alert - level: ERROR, type: MISSING_STATISTICS, object: (index) SAPR3.ZWHMIST~0

BR0986W Index SAPR3.DBABL~0 is unbalanced - please rebuild the index

BR0978W Database profile alert - level: WARNING, parameter: LOG_CHECKPOINT_TIMEOUT, value: 1800 (<> 0)

Can anybody tell what 's these error about ....

Regards

Anju

SAP basis