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dev:sql:statements:update_indexes:home [2010/07/02 18:39] tdo |
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| If only the Omnidex index specification needs to be synchronized, use the INSTALL INDEXES statement. This is typically used when converting between two releases. | If only the Omnidex index specification needs to be synchronized, use the INSTALL INDEXES statement. This is typically used when converting between two releases. | ||
| - | |||
| ===== Syntax ===== | ===== Syntax ===== | ||
| <code> | <code> | ||
| UPDATE INDEXES [ FOR environment_object ] | UPDATE INDEXES [ FOR environment_object ] | ||
| - | [ON [INSTANCE] instance] | + | [ ON [INSTANCE] instance_no ] |
| - | [WITH options] | + | [ WITH options ] |
| </code> | </code> | ||
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| os> | os> | ||
| </code> | </code> | ||
| - | |||
| ==== UPDATE INDEXES FOR environment_object ==== | ==== UPDATE INDEXES FOR environment_object ==== | ||
| A specific Database, Table, Column, or Index object can be specified to limit the area to build the indexes. | A specific Database, Table, Column, or Index object can be specified to limit the area to build the indexes. | ||
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| update indexes for column trans_table.trans_date; | update indexes for column trans_table.trans_date; | ||
| - | ==== WITH Options ==== | + | ==== WIth Options ==== |
| + | |||
| + | MAX_THREADS=thread_count allows the setting of the maximum number of processors to be used during the update index process. | ||
| + | |||
| + | update indexes with max_threads=4; | ||
| LOG=<directory> will cause Omnidex to write indexing logs to the specified directory. This is particularly useful for reviewing the status of large UPDATE INDEX operations. The directory has to be created before the UPDATE INDEXES statement is used. | LOG=<directory> will cause Omnidex to write indexing logs to the specified directory. This is particularly useful for reviewing the status of large UPDATE INDEX operations. The directory has to be created before the UPDATE INDEXES statement is used. | ||
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| ===== Examples ===== | ===== Examples ===== | ||
| - | The following example will create a logging directory relative to the current directory and then use the OdxSQL command SETENV to set the OA_MAX_ROWS environment variable to limit the maximum number of reads for each table to 100,000 rows to facilitate a quick indexing test. | + | The following example will create a logging directory relative to the current directory that Omnidex will use to write indexing information during the index process. The example also uses the OdxSQL SETENV command to set the OA_MAX_ROWS environment variable to limit the maximum number of reads for each table to 100,000 rows to facilitate testing. |
| <code> | <code> | ||
| os> odxsql | os> odxsql | ||