快速读取BSEG表数据(转)

The FI-GL table BSEG, which is one of our biggest PR1 tables, is an example of a clustered table. At the database-level, there is no table called BSEG, but instead RFBLG is being used for the BSEG data. Most of the fields known in BSEG are not known in the database table RFBLG, but are compressed in a VARDATA field of RFBLG. So tests in the WHERE clause of SELECTs agains BSEG are not used by the database (e.g. lifnr = vendor account number, hkont = G/L account, kostl = cost center). As a consequence, these tests are done after the facts similar to using the CHECK statement, and as already said in tip 1, CHECK statements are worse than tests in the WHERE-clause.
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1.BSAK Accounting: Secondary Index for Vendors
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3.BSIK Accounting: Secondary Index for Vendors
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6.BSAD Accounting: Secondary index for customersbbs.mysapclub.cn1 n2 \- S7 E  q3 e  }: x2 a
7.BSIS Accounting: Secondary Index for G/L Accountsbbs.mysapclub.cn+ @$ H$ [  y% ^
3) use logical data base e.g.: BRF