CTX_ADM Package

5 CTX_ADM Package

This chapter contains the following topics.

5.1 About CTX_ADM Package Procedures

The CTX_ADM PL/SQL package provides administrative procedures for managing index preferences.

The CTX_ADM package contains the following stored procedures.

Name	Description
MARK_FAILED	Changes an index's status from `LOADING` to `FAILED`.
RECOVER	Cleans up database objects for deleted Text tables.
RESET_AUTO_OPTIMIZE_STATUS	Resets the `CTX_AUTO_OPTIMIZE_STATUS` view.
SET_PARAMETER	Sets system-level defaults for index creation.

Note:

Only the CTXSYS user can use the procedures in the CTX_ADM package.

The APIs in the CTX_ADM package do not support identifiers that are prefixed with the schema or the owner name.

5.2 MARK_FAILED

Use the MARK_FAILED procedure to change the status of an index from LOADING to FAILED.

Under rare circumstances, if CREATE INDEX or ALTER INDEX fails, an index may be left with the status LOADING. When an index is in LOADING status, any attempt to recover using RESUME INDEX is blocked. For this situation, use CTX_ADM.MARK_FAILED to forcibly change the status from LOADING to FAILED so that you can recover the index with RESUME INDEX.

You must log on as CTXSYS to run CTX_ADM.MARK_FAILED.

WARNING:

Use CTX_ADM.MARK_FAILED with caution. It should only be used as a last resort and only when no other session is touching the index. Normally, CTX_ADM.MARK_FAILED does not succeed if another session is actively building the index with CREATE or ALTER INDEX. However, index creation or alteration may include windows of time during which CTX_ADM.MARK_FAILED can succeed, marking the index as failed even as it is being built by another session.

CTX_ADM.MARK_FAILED works with local partitioned indexes. However, it changes the status of all partitions to FAILED. Therefore, you should rebuild all index partitions with ALTER INDEX REBUILD PARTITION PARAMETERS ('RESUME') after using CTX_ADM.MARK_FAILED. If you run ALTER INDEX PARAMETER ('RESUME') after this operation, then Oracle resets the index partition status to valid. Oracle does not rebuild the index partitions that were successfully built before the MARK_FAILED operation.

Syntax

CTX_ADM.MARK_FAILED(
  owner_name     in    VARCHAR2,
  index_name     in    VARCHAR2);

owner_name: The name of the owner of the index whose status is to be changed.
index_name: The name of the index whose status is to be changed.

Note:

The index_name must not be prefixed by the schema or the owner name.

Example

begin
   CTX_ADM.MARK_FAILED('owner_1', 'index_1');
end;

5.3 RECOVER

The RECOVER procedure cleans up the Text data dictionary, deleting objects such as leftover preferences.

Syntax

CTX_ADM.RECOVER;

Example

begin
   ctx_adm.recover;
end;

5.4 RESET_AUTO_OPTIMIZE_STATUS

Use the RESET_AUTO_OPTIMIZE_STATUS procedure to reset (or delete the contents of) the CTX_AUTO_OPTIMIZE_STATUS view.

You must log on as CTXSYS to run CTX_ADM.RESET_AUTO_OPTIMIZE_STATUS.

Syntax

CTX_ADM.RESET_AUTO_OPTIMIZE_STATUS;

Example

begin
   ctx_adm.reset_auto_optimize_status;
end;

5.5 SET_PARAMETER

The SET_PARAMETER procedure sets system-level parameters for index creation and for near real-time indexes.

Syntax

CTX_ADM.SET_PARAMETER(param_name IN VARCHAR2,
                      param_value IN VARCHAR2);

param_name: Specify the name of the parameter to set, which can be one of the following parameters:

max_index_memory (maximum memory allowed for indexing)
default_index_memory (default memory allocated for indexing)
ctx_doc_key_type (default input key type for CTX_DOC procedures)
auto_optimize (ENABLE or DISABLE for auto optimization)
default_datastore (default datastore preference)
default_filter_file (default filter preference for data stored in files)
default_filter_text (default text filter preference)
default_filter_binary (default binary filter preference)
default_section_html (default html section group preference)
default_section_xml (default xml section group preference)
default_section_text (default text section group preference)
default_lexer (default lexer preference)
default_wordlist (default wordlist preference)
default_stoplist (default stoplist preference)
default_storage (default storage preference)
default_ctxcat_lexer (default lexer preference for CTXCAT index)
default_ctxcat_stoplist (default stoplist preference for CTXCAT index)
default_ctxcat_storage (default CTXCAT index storage
default_ctxcat_wordlist (default wordlist preference for CTXCAT index)
default_ctxrule_lexer (default lexer for CTXRULE index)
default_ctxrule_stoplist (default stoplist for CTXRULE index)
default_ctxrule_storage (default storage for CTXRULE index)
default_ctxrule_wordlist (default wordlist for CTXRULE index)

See Also:

To learn more about the default values for these parameters, see "System Parameters" in Oracle Text Indexing Elements

Note:

log_directory (directory for CTX_OUTPUT files) and auto_optimize_logfile (the base file name for the auto optimization log file) can no longer be modified. Any call to the API is ignored for these parameters.

param_value

Specify the value to assign to the parameter. For max_index_memory and default_index_memory, the value you specify must have the following syntax:

number[K|M|G]

where K stands for kilobytes, M stands for megabytes, and G stands for gigabytes.

For each of the other parameters, specify the name of a preference to use as the default for indexing.

For auto_optimize, the value you specify must be either ENABLE or DISABLE. When you set this parameter to ENABLE, auto optimization jobs can be started. When you set this parameter to DISABLE, no auto optimization jobs can be started and all the currently-running optimization jobs are terminated.

Example

To modify the MAX_INDEX_MEMORY value:

exec ctx_adm.set_parameter(‘MAX_INDEX_MEMORY’, 100G);

The memory parameter in the indexing statements can be as high as 256 GB (if the MAX_INDEX_MEMORY parameter is not explicitly specified to a lower value).

create index myindex1 on mytab(textcol) indextype is ctxsys.context parameters ('memory 256G');
exec ctx_ddl.sync_index(' myindex2', memory=> '256G');

Example

begin
  ctx_adm.set_parameter('default_lexer', 'my_lexer');
end;