Is the book from Sybex "OCA 10g ADministration I study guide" is enough for the 10g OCA exam?
Sybex's book is quite good for Oracle exams, however, if it is possible, I recommended you to get ILT materials still. It is of no doubt that ILT materials are the best resources to prepare Oracle exams.
should I get the "Oracle9i PL/SQL Developer Certified Associate" now? or wait until the nwer version come out.
OCA 10g Developer might be released within 1 year, and thus, it is of your own choice. Of course, taking new exams mean you wont have much resources for study.
Personally, I guess PL/SQL is too specific, unless you are interested in working with PL/SQL all the times, otherwise, you might consider other areas.
Nick
SCJP 1.2, OCP 9i DBA, SCWCD 1.3, SCJP 1.4 (SAI), SCJD 1.4, SCWCD 1.4 (Beta), ICED (IBM 287, IBM 484, IBM 486), SCMAD 1.0 (Beta), SCBCD 1.3, ICSD (IBM 288), ICDBA (IBM 700, IBM 701), SCDJWS, ICSD (IBM 348), OCP 10g DBA (Beta), SCJP 5.0 (Beta), SCJA 1.0 (Beta), MCP(70-270), SCBCD 5.0 (Beta), SCJP 6.0, SCEA for JEE5 (in progress)