Oracle Database 12c Performance Tuning Recipes: A by Sam Alapati, Darl Kuhn, Bill Padfield

By Sam Alapati, Darl Kuhn, Bill Padfield

Functionality difficulties are hardly ever "problems" in line with se. they're extra usually "crises" in which you are confused for effects through a supervisor status open air your cubicle whereas your mobilephone earrings with queries from the assistance table. you will not have the time for a leisurely perusal of the manuals, nor to lean again and skim a ebook on concept. What you wish in that scenario is a e-book of options, and ideas are accurately what Oracle Database 12c functionality Tuning Recipes supplies. Oracle Database 12c functionality Tuning Recipes is a prepared reference for database directors short of quick support with functionality concerns in terms of Oracle Database. The ebook takes an example-based procedure, in which each one bankruptcy covers a selected challenge area. inside each one bankruptcy are "recipes," exhibiting by way of instance the right way to practice universal projects in that chapter's area. recommendations within the recipes are sponsored by way of transparent reasons of heritage and idea from the writer group. regardless of the job, if it is performance-related, you'll likely discover a recipe and an answer during this e-book.

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Tip The following clauses are synonymous: COMPRESS, COMPRESS BASIC, ROW STORE COMPRESS, or ROW STORE COMPRESS BASIC. You can verify that compression has been enabled for a table by querying the appropriate DBA/ALL/USER_TABLES view. info Chapter 1 ■ Optimizing Table Performance Here is some sample output: TABLE_NAME COMPRESS COMPRESS_FOR ------------------------------ -------- -----------REGS_DSS ENABLED BASIC The prior output shows that compression has been enabled in the basic mode for this table.

Sometimes it’s handy to proactively send yourself the recommendations. This allows you to periodically review the output and implement suggestions that make sense. The shell script in the “Solution” section contains a line near the top where the OS variables are established through running an oraset script. This is a custom script that is the equivalent of the oraenv script provided by Oracle. You can use a script to set the OS variables or hard-code the required lines into the script. Calling a script to set the variables is more flexible and maintainable, as it allows you to use as input any database name that appears in the oratab file.

You access the index as if it were a table. The data are stored in a B-tree-like structure. Unique A form of B-tree index; used to enforce uniqueness in column values; often used with primary key and unique key constraints but can be created independently of constraints. Reverse-key A form of B-tree index; useful for balancing I/O in an index that has many sequential inserts. Key-compressed Good for concatenated indexes in which the leading column is often repeated; compresses leaf block entries; applies to B-tree and IOT indexes.

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