Db.set_h_nelem
Db.set_h_nelem |
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import com.sleepycat.db.*;public void set_h_nelem(int h_nelem) throws DbException;
Set an estimate of the final size of the hash table.
If not set or set too low, hash tables will still expand gracefully as keys are entered, although a slight performance degradation may be noticed.
The Db.set_h_nelem interface may be used only to configure Berkeley DB before the Db.open interface is called.
The Db.set_h_nelem method throws an exception that encapsulates a non-zero error value on failure.
The Db.set_h_nelem method may fail and throw an exception encapsulating a non-zero error for the following conditions:
Called after Db.open was called.
The Db.set_h_nelem method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the Db.set_h_nelem method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.
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Copyright Sleepycat Software
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In order for the estimate to be used when creating the database, the Db.set_h_ffactor method must also be called. If the estimate or fill factor are not set or are set too low, hash tables will still expand gracefully d32 2 a33 7
The Db.set_h_nelem method configures a database, not only operations performed using the specified Db handle.
The Db.set_h_nelem interface may not be called after the Db.open interface is called. If the database already exists when Db.open is called, the information specified to Db.set_h_nelem will be ignored. d43 3 a45 3 If a catastrophic error has occurred, the Db.set_h_nelem method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way. d49 37 a85 1 Databases and Related Methods @ 1.1.1.4 log @Import: RPM 4.1 @ text @d1 2 a2 2 d4 1 d30 4 a33 1
If not set or set too low, hash tables will still expand gracefully d36 7 a42 2
The Db.set_h_nelem interface may be used only to configure Berkeley DB before the Db.open interface is called. d52 3 a54 3 If a catastrophic error has occurred, the Db.set_h_nelem method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way. d58 1 a58 37 Db.associate, Db.close, Db.cursor, Db.del, Db.fd, Db.get, Db.pget, Db.get_byteswapped, Db.get_type, Db.join, Db.key_range, Db.open, Db.put, Db.remove, Db.rename, Db.set_append_recno, Db.set_bt_minkey, Db.set_cachesize, Db.set_errcall, Db.set_errpfx, Db.set_feedback, Db.set_flags, Db.set_h_ffactor, Db.set_h_nelem, Db.set_lorder, Db.set_pagesize, Db.set_q_extentsize, Db.set_re_delim, Db.set_re_len, Db.set_re_pad, Db.set_re_source, Db.stat, Db.sync, Db.truncate, Db.upgrade, and Db.verify. @ 1.1.1.5 log @Import: RPM 4.1.1 @ text @d1 2 a2 2 a3 1 d29 1 a29 4
In order for the estimate to be used when creating the database, the Db.set_h_ffactor method must also be called. If the estimate or fill factor are not set or are set too low, hash tables will still expand gracefully d32 2 a33 7
The Db.set_h_nelem method configures a database, not only operations performed using the specified Db handle.
The Db.set_h_nelem interface may not be called after the Db.open interface is called. If the database already exists when Db.open is called, the information specified to Db.set_h_nelem will be ignored. d43 3 a45 3 If a catastrophic error has occurred, the Db.set_h_nelem method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way. d49 37 a85 1 Databases and Related Methods @