Having one single tablespace versus multiple tablespace?

My database version is
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE 11.1.0.7.0 Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production
My os version is
Linux damdat01 2.6.18-128.7.1.el5 #1 SMP Wed Aug 19 04:00:49 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
My database is OLP system.
My question is what are the advantages and disadvantages having one single tablespace versus multiple tablespace?
Easy to maintain when you have single tablespace. but hard to track the IO issues.
Any other input from any one? Please let me know.

Billy Verreynne wrote:
EdStevens wrote:
Does the term "keeping all your eggs in one basket" mean anything ....Well, in the majority of cases, even when using multiple tablespaces they will be on the same storage array or same file system. So the "+all eggs in one basket+" goes a lot a deeper down the storage layer than just the top part where you deal with logical tablespace storage containers.
Absolutely. Except for the bazillion microscopic solid-state switches and a layer of rust on a spinning platter, everything else is just layers of abstraction. One's thinking and frame of reference depends on what layer of abstraction one is dealing with.
The major problem with multiple tablespace for a single application And here is where there was some 'fuzz' in the OPs question. I don't recall him specifying one TS per application. Maybe he assumed that, but I read it as one (user) TS per database.
a) deciding the space allocation of each tablespace
b) managing what is created in which tablespace
This comes down do an issue of micro-managing space versus simply chucking everything into a single container and let god ASM/Oracle/LUN/driver/whatever sort them out.
Issues like transportable tablespaces... separating your logical data into different containers... and the like? That is not really sufficient justification to me for having to micro-manage space for a 101 tablespaces. This simply creates a huge workload on the space management part of the database - that is complex and difficult to deal with. Free space from an underutilised (incorrectly sized) tabelspace cannot simply be moved and reallocated to a tablespace stressed for more space. Everything but...
Which is why I prefer having fewer tablespaces as this means not having to micro-manage space and continually having to wave a threatening lead pipe around to make sure that applications and developers play rigidly within the large set of strict rules of how these many tablespaces are to be used.Agreed. One can go way overboard, and a lot of this discussion hinges on the OP's intent, as I mentioned above -- one TS per ... what? My default position is one TS per application schema. Normal human users all default to one USERS ts, but don't have any quota because they don't have any reason to create objects.

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declare
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begin
v_z :=0.0;
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SELECT s.ssm_id,
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     'Y              ' AS c_srm_flag,     --c_srm_flag     = "Y              ",
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FROM sec_tab_sdb s,
sr_measures srm,
sec_sw sw
WHERE s.ssm_id = srm.ssm_id
AND   s.ssm_id = sw.ssm_id;
insert into rd_finance_new1
select s.ssm_id,
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     v_z as oas,
     v_z as carry,
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     v_z as price_drop,
     sw.heldby_pco_sw,
     v_z as rolldown_bk1,        -- place holders for interim results
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     'SRM' as finance_method, -- audit for financing_rate queries
     'Y              ' as r_srm_flag,    -- Indicates value from SRM, stale these should not be updated at any point
     'Y              ' as o_srm_flag,
     'Y              ' as c_srm_flag,
     'Y              ' as f_srm_flag
from sec_tab_sdb s,
sr_measures srm,
sec_sw sw
where s.ssm_id = srm.ssm_id
and   s.ssm_id = sw.ssm_id;
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select s.ssm_id,
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        v_z as price_drop,
        sw.heldby_pco_sw,
        v_z as rolldown_bk1,             -- place holders for interim results
        v_z as rolldown_bk2,
        'Y              ' as r_srm_flag,   -- Indicates value from SRM, stale these should not be updated at any point
        'Y              ' as o_srm_flag,
        'Y              ' as c_srm_flag,
        'Y              ' as f_srm_flag,
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from sec_tab_sdb s,
sr_measures srm,
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where s.ssm_id = srm.ssm_id
and   s.ssm_id = sw.ssm_id;
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try this please
INSERT ALL
INTO RD_CARRY_NEW1 VALUES
    SSM_ID,
    ROLLDOWN,
    OAS,
    carry,
    finance_rate,
    price_drop,
    heldby_pco_sw,
    rolldown_bk1,
    rolldown_bk2,
    r_srm_flag,
    o_srm_flag,
    c_srm_flag,
    F_SRM_FLAG,
    rolldown_method
INTO RD_FINANCE_NEW1 VALUES
    SSM_ID,
    ROLLDOWN,
    OAS,
    carry,
    finance_rate,
    price_drop,
    heldby_pco_sw,
    rolldown_bk1,
    rolldown_bk2,
    r_srm_flag,
    o_srm_flag,
    c_srm_flag,
    F_SRM_FLAG,
    rolldown_method
INTO PCO_OWN.RD_ROLLDOWN_NEW1 VALUES
    SSM_ID,
    ROLLDOWN,
    OAS,
    carry,
    finance_rate,
    price_drop,
    heldby_pco_sw,
    rolldown_bk1,
    rolldown_bk2,
    r_srm_flag,
    o_srm_flag,
    c_srm_flag,
    F_SRM_FLAG,
    rolldown_method
SELECT s.ssm_id,
NVL(srm.rolldown,0) AS rolldown,
v_zero              AS oas,
v_zero              AS carry,
v_zero              AS finance_rate,
v_zero              AS price_drop,
sw.heldby_pco_sw,
v_zero            AS rolldown_bk1,
v_zero            AS rolldown_bk2,
'Y              ' AS r_srm_flag,
'Y              ' AS o_srm_flag,
'Y              ' AS c_srm_flag,
'Y              ' AS f_srm_flag,
'SRM'             AS rolldown_method
FROM sec_tab_sdb s,
sr_measures srm,
sec_sw sw
WHERE s.ssm_id = srm.ssm_id
AND s.ssm_id   = sw.ssm_id;

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2.Tough managebility and portability.
3.Putting tablespace offline will offline all the datafiles, which will stop other applications/of its parts unnecessarily.
4.More datafiles for DBWR for writting and more files for RMAN to backup.
5.Many datafiles are opens when we online tablespace; means many file handlers for OS at kernel side.
6.We have to carefull to create rollback segments because, never create rollback segments using multiple datafiles within a single tablespace.
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1) My first question is..."Is there a way to run the
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>
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Message was edited by:
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Having one single tablespace versus multiple tablespace?

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